Shunt releases are devices that are installed with circuit breakers. Most often, the models are used when it is also important to note that the releases are capable of being operated with load break switches.
Manufacturers make models for 20, 24 and 30 A. The design of the device may vary. In order to understand this issue in more detail, you should consider the standard release circuit.
Scheme of a conventional model
The shunt trip has a diode rectifier. Dinistors are used with different conductivity. In this case, expanders are installed with modulators. If we consider modifications for phase switches, then a transceiver is provided in them. The relay is most often installed at the bottom of the structure.
For safe operation of the release, insulators are used. Contacts are located above the modulator. Transistors are installed opposite each other. Kenotrons are often used with an external winding and are mounted behind the modulator.
Principle of operation
How does a shunt release work? This question worries many, but the answer to it is extremely simple. In fact, the principle of operation of the shunt release is based on changing the position of the contacts. This happens due to the supply of a short pulse from the diode rectifier. In this case, the transistor acts as a conductor. By means of the modulator, the frequency of the release can be adjusted. A kenotron is used to combat electromagnetic interference.
Device connection
How to connect a shunt release? If we consider ventilation systems, then the device is connected through dinistors. In this case, the output contacts are connected through insulators. The negative resistance parameter itself must fluctuate around 25 ohms. The connection to the relay is provided through an expander. When connecting, check the threshold resistance. The specified parameter should not exceed 30 ohms. The release is fixed in the power panel. To check the voltage, you must use a tester.
20 amp models
20 A releases are often used for phase breakers. The threshold voltage parameter for the models is in the region. Some modifications are made with stabilizers. It is also important to note that there are releases with the IP20 protection system on the market. The transistors in them are used of a broadband type. All this suggests that they can withstand large overloads in the circuit.
Many models are connected to the dashboard via kenotrons. They are produced most often of the two-contact type. The current conductivity of many models does not exceed 5 microns. It is also important to note that models for ventilation systems are produced with condenser modulators. In some cases, they are mounted with extenders. For remote control switches they fit perfectly.
Devices for 24 A
24A devices consist of diode rectifiers. They are installed with different conductivity. As a rule, the IP21 series is used for the protection system. However, in this case, a lot depends on the manufacturer. Modulators are used only of the orthogonal type. For pulse switches, models based on semiconductor thyristors are suitable.
Stabilizers in devices are used with low sensitivity. The output voltage of this type of release does not exceed 20 V. On average, the current conductivity is 3 microns. Insulators are used to attach the device to the panel. If we consider modifications without transceivers, then a capacitor unit is used in them. Many modifications are suitable for low voltage circuit breakers.
Modifications for 30 A
The 30 A trip units are manufactured with code expanders. The output voltage for the models is 35 V. As a rule, diode-type rectifiers are used. In this case, the contacts are mounted on movable plates. Transceivers are used with Many models are connected to panels via capacitor banks. In order to avoid large overloads of the circuit, expansion dynistors are used.
Some releases are made on the basis of a two-pole transceiver. Their distinctive feature is their high current conductivity. This parameter fluctuates around 6 microns. However, the disadvantage of such systems is the rapid deterioration of the capacitors. It is also important to note that the models are not suitable for impulse switches.
Model Z-ASA / 230
The shutdown of ventilation in the event of a fire through the shunt release Z-ASA / 230 occurs very quickly. The specified model is produced with movable plates. There are six pairs of contacts in total. For impulse switches this device fits perfectly. It is also important to note that the model is capable of operating in high humidity conditions. The actual opening of the contacts is very fast. For remote control of the ventilation system, the specified installation is well suited. The current conductivity of the presented release is 4.5 µm.
In this case, the output voltage to the relay is 30 V. The stabilizer is installed in the device without an adapter. The transistors are of dual type. The kenotron is not provided for the model. The shunt release is connected to the shield through a dinistor. It is installed with one panel, which is located at the bottom of the case. Before connecting the device, first of all, the negative resistance for each phase is checked. It is also important to note that it is important to insulate the wiring carefully.
Model Z-ASA / 250
What is the purpose of the Z-ASA / 250 shunt release? This model is used exclusively for phase switches. Its current conductivity is 4.5 microns. The threshold overload of the device is no more than 24 A. The output voltage on the relay does not exceed 33 V. The rectifier is of diode type. There are five pairs of contacts in the device. The modulator for this release is of the orthogonal type. To connect the model, a capacitor unit is used, which is included in the standard modification kit.
If we talk about design features, it is important to note that the transceiver is of the single-pole type. The protection system is provided by the manufacturer with the IP30 marking. The minimum allowable temperature of the release is no more than -15 gr. The stabilizer is not provided in this configuration.
Model IEK PH47
This shunt trip (photo shown below) is pretty much in demand. First of all, it is important to mention its compactness. A small capacitor unit is used for connection to the shield. In total, the model uses two rectifiers. Contacts in this case are of a movable type. The expander itself is located at the bottom of the structure together with the relay. There is no transceiver in this case.
If we talk about the parameters of the release, it is important to note that it maintains the output voltage at 40 V. The threshold overload of the model is 30 A. The minimum permissible temperature of the release does not exceed -10 degrees. The model is not afraid of high humidity. The protection system is standardly applied with the IP30 marking. The wiring in this case is used with insulators for safe operation.
Model IEK PH48
This shunt trip (wiring diagram shown below) is manufactured with two diode type rectifiers. The relay in the device uses a high voltage. The parameter of the conductivity of the current is at the level of 4 microns. There are two resistors in the device. Contacts are installed on special plates. The actual opening is carried out quite quickly. It is also important to note that the device may be connected via a capacitor unit. The output relay is located at the bottom of the structure.
The modulator is of the orthogonal type. The model is suitable for phase switches. If we talk about the parameters, it is important to note that the threshold overload is at the level of 24 V. The output voltage on the relay reaches a maximum of 30 V. The minimum permissible modification temperature is -15 degrees. The protection system in the release is used with the IP30 marking.
Model IEK PH50
This shunt release is produced for impulse and phase switches. It suits well for ventilation systems and drives. The conductivity of the current is about 3 microns. The negative resistance parameter on the relay reaches a maximum of 46 ohms. The transceivers in the release are of two-pole type. In total, the model has three pairs of contacts.
They are mounted on special plates that are located above the relay. The modulator is provided by the manufacturer of the orthogonal type. It is prohibited to connect the model through the capacitor unit. For this, only the kenotron is suitable. The minimum allowable temperature of the release is -10 degrees. The output voltage to the relay reaches a maximum of 40 V.
Model SHUNT 230 VAC
This shunt release can only be used in conjunction with a phase breaker. The model is ideal for remote control of the drive. The expander is used here by the code type. Also of the features, it should be noted the presence of trimming resistors. Direct signal transmission is carried out thanks to a diode rectifier. The modulator is used in an orthogonal type circuit. The threshold overload of the system does not exceed 30 A. The minimum allowable temperature of the release is at around -20 degrees.
Model SHUNT 250 VAC
This shunt trip (wiring diagram is shown below) is made on the basis of a diode rectifier. It is located above the relay. If we talk about the parameters of the device, then the negative resistance of the system is 44 ohms. In this case, the threshold overload is no more than 24 A. To connect the modification, there is a compact capacitor unit. Conductors in this case are used with insulators. In total, the model has three pairs of resistors. They are located above the rectifier. The stabilizer in this case is not provided by the manufacturer. For small drives this model fits perfectly.
Model S2C-A
This shunt release can only be used with impulse switches. The rectifier in the device is of diode type. The relay is used with an expander. The current conductivity index is no more than 4.5 microns. The transceivers are installed above the relays.
The stabilizer is not installed in the presented release. The contacts of the model are located on the plates. Signal transmission is carried out thanks to an orthogonal type modulator. The release is connected via the kenotron. Capacitor units are not suitable for this purpose. The minimum allowable temperature of the release is at -10 degrees.
Finally took a moment to write a new article. The shunt release is an additional device to the circuit breakers. Now we will talk about the use of a shunt release in our projects and how to connect the shunt release correctly.
The shunt release allows the circuit breaker or load breaker to be tripped remotely. Shunt releases are most often used in ventilation design. According to regulatory documents, ventilation in the event of a fire must be turned off, therefore, in addition to the input device of the ventilation board, an independent release is installed. Boards up to 100A are equipped with modular circuit breakers. A load switch can be installed at the entrance to the switchboard. It is the input device that we disconnect with the help of an independent release. At a current of more than 100A, a BA88 series circuit breaker can be installed at the input to the shield. A shunt release can also be installed on this unit. In my projects, it was not yet required to remotely disconnect the VA88 =)
Now let's move on to the shunt trip connection diagram.
The shunt release can trip both single-phase and three-phase devices. To activate the shunt release, it is enough to apply a voltage pulse to the release coil. For the construction of the machine in the initial state you must manually press the "return" button. This allows signaling from what the circuit breaker has tripped: either from overload (short-circuit) or from remote shutdown.
The shunt trip control circuit is shown below.
It is very important here that the phase conductor is connected from one of the phases from under the lower terminals. circuit breaker... At wrong connection the shunt release will fail. After turning off the machine, the voltage from the release coil disappears.
The control signal for the operation of the shunt release can be a normally open contact from a fire alarm device or a conventional button with a normally open contact.
Sometimes a situation may arise when it is necessary to disconnect several shunt releases with one signal at once. For example, you have 2-3 fans, which there is no point in separating them into a separate cabinet. Therefore, we put our own shunt release for each group. This topic was raised on the forum ...
The control circuit of several shunt releases from one signal is presented below.
The main thing here is that the same phase is used.
It is worth noting that a shunt trip is not a cheap pleasure. Its size is the same as that of a single-pole machine (1 module), but it costs an order of magnitude more.
In every modern unit, which is used as a reliable protective mechanism for power grids in the household industry, there is always a circuit breaker with an independent release. The principle of the device of such an element implies the presence of a mechanical connection with the switch. Its main task is to disconnect the power supply in a timely manner when exposed to one or another negative factor.
a brief description of
Universal shunt releases are multifunctional units that are always installed with circuit breakers. Most often, such devices are used in the design process of a high-quality ventilation system. A huge advantage is that the releases can be freely operated with a variety of load break switches. Modern manufacturers specialize in the industrial production of those models that are designed for 20, 24 and even 30 A. The design of each unit may differ.
In order for the acquired shunt release to complete all the tasks and not break down, you need to figure out the scheme of its functioning. The thing is that such a unit, which is designed for an automated switch, always equipped with a diode rectifier... Manufacturers are accustomed to using powerful dinistors of various capacities. The efficiency of their operation depends on the built-in modulators.
Standard models for phase switches are necessarily equipped with special transceivers. The controlled relay is mounted in the lowest compartment of the structure, which greatly simplifies the operation of the unit.
To protect the consumer from electric shock, experts have provided for the availability of high-quality insulators. Reliable contacts are located above the main modulator. But the transistors are installed parallel to each other. With a standard outer winding, kenotrons are often used, which are fixed behind the modulator.
General device
Each model of the shunt release is presented as a high quality unit used for remote tripping of protective equipment. Such a unit is operated together with modern circuit breakers that have one, two, three or even four poles. Most often, the masters connect the release to the input circuit breaker, and in case of any emergency there is a complete de-energization of the electrical panel.
The design of the unit is more like a magnet. When a short-term impulse affects it, the device acts with a special lever on the working mechanism, which turns off the automated protective device. Besides, the design provides for the presence of an electromagnetic coil, which can have different power indicators. The product can be designed for direct or alternating current with a voltage of 110-415 V and 12-60 V. It all depends solely on the chosen model. The method of attachment to the machine also depends on the modification.
It is worth noting that the timely operation of the entire system depends on the correct connection of the release with the protective device. The master must comply with all the requirements of the connection diagram. For example, phase conductors should go from the lower phase terminals of the machine.
If this rule is not followed, then this is fraught with premature failure of the installation. When everything is working correctly, the shunt trip circuit breaker is disconnected in a timely manner, and the voltage from the coil of the device completely disappears.
Principle of operation
To protect household electrical circuit from adverse effects, craftsmen use high-quality automated switches modular design... The great demand for such units arose against the background of the fact that they have compact dimensions, and are also easy to install and repair.
Outwardly, such devices are presented in the form of a conventional housing made of heat-resistant plastic. The main on / off button is located on the front surface. On the rear panel there is a latch-lock for installation on a DIN rail, and on the bottom and top there are screw terminals.
During normal operating conditions, a current less than or equal to the rated current flows through the unit. The supply voltage from the external network is supplied to the upper terminal (this node is reliably connected to a fixed contact). Further, electricity is supplied to the main thermal release, and after it - to the lower terminal and the load network connected to it. In emergency situations, the circuit breaker disconnects the protected circuit. An independent device is responsible for this function. The reason for such a trigger may be some kind of emergency:
- Overload voltage - short circuit in the chain.
- The occurrence of overcurrents - an increase in the current strength in the mains, exceeding the rated value of the circuit breaker.
- Voltage drops.
Varieties of the lineup
Many DIYers prefer to use the time-tested shunt releases. Such units are triggered exclusively by voltage, which gradually passes through the main circuit of the circuit breaker. The great popularity of such installations arose against the background of the fact that each master can control the system remotely, which is not provided for in other categories of releases.
An automated switch helps to timely disconnect absolutely all devices and other sources that operate on electricity from the mains. This function is especially important in situations where there is a noticeable voltage deviation in the network from the norm set by the consumer. But it is important to take into account the disadvantages that are associated with the conversion of energy into heat release. The presence of such a factor may be fraught with the fact that the switch will be disconnected in an improper way.
Modern Z-ASA / 230
Manufacturers note the fact that the shutdown of ventilation in the event of a fire through an independent switch of this series occurs extremely quickly. This model is available with high quality mobile modules and six pairs of contacts. Such a device is especially relevant in relation to impulse switches. The unit works well in extreme conditions where high humidity is observed. The device is often used by specialists for remote control. The level of current conductivity is equal to 4.5 microns.
The unit supplies the relay with a voltage of 30 V. A powerful stabilizer is mounted without any adapter. The long service life is due to the presence of dual-type transistors. It should be noted that the kenotron is not provided in this model.
Advanced modifications for 30A
This type of trip unit for the circuit breaker is manufactured with a special code expander. The final indicator of the output voltage is equal to 35 V. The well-coordinated work of the unit is associated with diode rectifiers. All contacts are mounted on movable plates.
Experts have provided for the presence of transceivers with trimming resistors. Many models in this category are connected to the mains panels via high quality capacitor banks. To prevent the negative impact of unplanned overloads on the network, expansion dinistors are used.
Unit IEK PH47
Experts say with confidence that this release is one of the most demanded. The compactness of this model is of great importance. A secure fit with the flap is ensured by the small condensing units. In addition, the model has only two rectifiers, and all contacts are movable.
The expander itself is located in the lower compartment of the structure along with the relay. The presence of a transceiver is not provided.
Increased attention should be paid to the operating parameters of the shunt release - the output voltage is within 40 V. The maximum network load should not exceed 30 A. In addition, numerous studies have been carried out by manufacturers, which have shown that the minimum tripping temperature is within -10 ° C ... The unit is absolutely not afraid of exposure to high humidity. All wiring is insulated in a special way for safe operation of the device.
Household SHUNT 250 VAC
This model of shunt release is produced on the basis of a diode rectifier located above the relay. Attention should be paid to the operating parameters of the system, which are 44 ohms. The standard threshold overload is equal to 24 A. A miniature capacitor unit is used to connect the modification.
All conductors are equipped with heavy-duty insulators. The unit is equipped with three pairs of resistors at once, securely fixed above the rectifier. Manufacturers have not provided only for the presence of a stabilizer. This makes this model ideal for low-power drives.
Sudden shutdown of the mechanism
Experts have recorded a lot of cases when the trip unit of the circuit breaker tripped. This situation requires a quick response from the master. To prevent negative consequences, experts have identified the main list of reasons that provoke the shutdown of the mechanism:
Since there are so many negative factors in the household industry, all modern devices began to be equipped with several working mechanisms at once, which allow you to quickly disconnect the network. They are released from mechanical, electromagnetic or electronic particles. Rational use of such a release helps to keep all home appliances intact and safe.
Serviceability check
Sooner or later, every master has situations when it is necessary to make sure of the integrity of the releases. This question is of particular interest to amateur installers and novice craftsmen. You can make sure that the unit is working in this way:
It should be noted that any tests of the operation of the shunt trip units for tripping must be carried out exclusively in specialized clothing and under the supervision of a qualified specialist.
I never wrote about releasers, because I thought that everything was clear and understandable with them. But my adored syncs told me the world wants this post because three different people asked me about these releases earlier this week. As usual, I'm tired of writing the same thing to everyone - and I'm making a post! =)
What is this release? This is the thing you need to get the machine to fire and shut down. And what is this for? Initially, this is a confusion for firefighters: when the "Fire" signal comes to the shield, then it is necessary to turn off any ventilation so that it does not fan the fire (if this is not so, then correct me in the comments, please). In order not to put contactors for this (which is more expensive and heats up), we found a simple solution in the form of a release.
Basically, these releases are used in this way: it is irreversible (until you come and turn it on with your hands) to disconnect any circuit. One of the customers asked me to put a release for him directly on the main switch, so that, on an external command, he would cut the input in the shield. Yes! Switch! Since ABB's modular circuit breakers have been upgraded to the SD200 () series, they have been fitted with the same accessories as the S200 series.
Be careful! The releases are suitable ONLY for circuit breakers and circuit breakers of the full series - S200, SD200. Household series SH200 (L), SHD200 are not suitable!
And the same ABB shunt releases are installed on the trainer of the OKA carriage in the UOC Metro at the Vystavochnaya station. There they are used in order to simulate the triggering of automatic devices in a carriage - this is how various emergency situations are worked out (in the metro they are called "cases") when train drivers are trained.
Here are the order codes for them:
- 2CDS200909R0001 ABB S2C-A1 Remote release for S200 AC / DC 12..60V (right connection)
- 2CDS200909R0002 ABB S2C-A2 Remote release for S200 AC 110..415V (right connection)
There is a weak electromagnet inside the release, which pulls the lever inside the machine and thereby makes it work and turn off. It's that simple! Here is a connection diagram for you ( the release circuit would be very well protected with a fuse):
See how the release is cleverly connected here: it shuts itself off. Why is this done? That is why: the first models of releases (and especially Chinese ones) had only an electromagnet inside. It is clear that if in this case you constantly apply power to the electromagnet, then it will continue to work and overheat and die. Then the releases were modified so that he could turn himself off, but the circuit has historically remained.
If the external signal with which the release should be disconnected is a normal dry contact, then take a 230V release and do as it is shown in my diagram. If you want to reset the machine with a low-voltage signal, then take a low-voltage release, but it is better to make the control signal pulsed. Just in case.
Well, the third option is to untie everything we want with the help of intermediate relays, of course. And the inversion of the signal, if necessary, and the control voltages.
The release must be connected to the circuit breaker or circuit breaker before we put them on the DIN rail in the switchboard. The trip unit comes with a small lever and instructions. At a machine or a circuit breaker, you need to peel off the plug near the handle and insert this lever there. The instructions were very muddy, and I succeeded on the fourth try. Therefore, I tried to take a picture of how this lever is in the machine's drive:
And after the lever is inserted, it should look like this:
You can even check its operation: cock a machine gun or a circuit breaker, press a lever, and the machine will immediately turn off.
After that, in the off position, we snap the release to the machine or, in our case, the switch:
And this is how it all looks in, where this release must turn off a dozen lines of small single-phase fan coil units. In the photo, a test power is thrown to the switch on top - I was just checking whether I put the control lever in the switch correctly.
It was originally thought here that the fan coil units will be powered by three phases - so I ordered a three-pole switch. Then the customer insisted that all fan coil units should be hung on one phase, and the switch began to break L-N. That's the whole trick with trip units!
Hello, dear readers and guests of the "Notes of an Electrician" website.
In this article, I will continue the conversation about modular releases and today the next step is the RN47 shunt release.
And according to tradition, first I will do short review shunt release RN47, I will tell you about its scope, specifications and the connection diagram, and at the end I will check its performance in tandem with the machine.
The article will focus exclusively on the RN47 release from the IEK company (article MVA01D-RN), although similar releases are available in catalogs from other manufacturers.
So let's go.
Independent voltage release RN47 is required for remote disconnection of the modular circuit breaker.
What is it for ?!
Yes, for various reasons! But most often, RN47 releases are used in the event of a fire to turn off the corresponding machines supplying the ventilation system (SNiP 41-01-2003, clause 12.4), for example, in schools, offices, production workshops, etc.
True, in many projects, an independent release is usually replaced by a ventilation supply circuit through a contactor, and an output contact from a fire alarm station is cut into the switching circuit of the contactor coil.
I do not argue that both options have the right to life, but with the use of an independent release, it is much easier, more compact and even cheaper to do this.
The circuit with the RN47 shunt release has a minimum of commutations (I will return to it a little later in the text), the device itself occupies only one module in the shield, and its cost at the time of this writing is about 1100 rubles.
Recently, RN47 trip units have increasingly begun to be used in many residential buildings. In the event of a fire, an impulse from the fire alarm panel arrives at the shunt release, which in turn turns off the automatic power supply of the electromagnetic door lock.
I gave just a couple of examples. In fact, the use of a shunt release can be thought up as much as you like, according to your needs and requirements.
Brief technical characteristics of RN47:
- rated supply voltage 230 (V)
- operating voltage range 161 - 253 (V)
- number of "enable-disable" (VO) cycles - not less than 10000
The RN47 release is compatible with single-pole, two-pole, three-pole and even four-pole circuit breakers VA47-29 and VA47-100, and as you can see, it even has a similar design with them. By the way, the RN47 release under consideration is a sample of a new series.
Like the RMM47 overvoltage and undervoltage release, the RN47 release is connected to the machine on its right side. In this case, the machine must be in the off position without fail, and the "Reset" button of the release is pressed.
The trip unit has 3 guide rods that fit snugly into the corresponding holes in the circuit breaker body.
In addition to the rods, the release has a moving rod, which, when docked, is placed in the side opening of the machine.
In the event of activation of the RN47, the rod acts on the disconnecting mechanism of the machine, thereby turning it off.
The release is inserted into the circuit breaker all the way - there are no latches.
This is how a single-pole automatic circuit breaker VA47-29 looks like, assembled with an RN47 shunt release.
The three-pole circuit breaker mates in the same way.
Attention! The spatial arrangement of the circuit breaker with the release can be at least vertical, at least horizontal - this does not at all affect the performance.
Connection diagram of the RN47 release
The RN47 release has two terminals, designated as C1 and C2.
In total, there are two schemes for connecting RN47.
1. Scheme No. 1 (power supply from the terminals of the machine)
We connect the release, as per the diagram above, and check its performance. Instead of the SB1 button contact, we connect the control key using its normally open contact.
The supply phase comes to the upper terminal of the machine, and from the lower terminal goes to the load. From the same lower terminal of the machine, we make a jumper (phase) to terminal C2 of the RN47 release. From terminal C1 we make a jumper to the terminal of the normally open contact of the control key or button. From the other terminal of this contact we make a jumper to the zero bus N.
When you turn the control key (close its contact), the shunt release is triggered and turns off the circuit breaker. On the front side of the release, the "Reset" button popped up, which symbolizes that the circuit breaker tripped due to the influence of the shunt release on it.
To turn on the machine, you first need to press the "Return" button, and only then cock its power-on handle, otherwise the machine simply will not turn on.
It is very convenient that there is no need to guess the reason for turning off the machine. If the machine is disconnected from the influence of the shunt release on it, it will be immediately visible by the "Return" button. If the circuit breaker has disconnected from its protections (), then, accordingly, the "Return" button on the release will remain in its original pressed state.
For clarity, I will give an example of a circuit board with the connection of the RN47 release on one outgoing line.
Unlike the RMM47 overvoltage and undervoltage release, the PH47 shunt release can be connected both before and after the circuit breaker.
The fact is that inside its case there is a microswitch that breaks the power supply circuit of the electromagnet coil.
When the release coil is triggered, the "Return" button bounces off and, with its rod, opens the contact of the built-in microswitch installed inside the release case.
This is confirmed by the fact that when the "Return" button is pressed, we can measure the resistance of the coil, which is 88.6 (Ohm).
But when the button is released, the coil resistance cannot be measured, because its circuit is open by a microswitch contact.
All in all, electrical circuit of the shunt release is very simple - it is a coil connected through a microswitch contact and two terminals for connecting the release to an AC voltage source.
Therefore, there will be no errors in how exactly the release will be connected - it can be safely connected both before and after the machine! In any case, the coil opens itself after operation and provides protection against prolonged exposure to voltage.
Shunt release RN47 can be connected and vice versa, i.e. connect the phase to the C1 terminal, and to the C2 - zero N through the normally open contact of the control key or button. The device will not burn from this, because the release coil is designed for operation on an alternating voltage network and has no polarity.
There are situations when it is necessary to disconnect several lines at once with one signal. In this case, a separate shunt release is installed on each line (machine), and they are controlled by one signal. The scheme in this case will be as follows. Here, be careful that the phase on all releases is of the same name!
2. Scheme No. 2 (independent power supply)
Scheme No. 2 differs from the previous one in that the power for the release is not taken from the same phase from which the load is connected, but from a separate AC voltage source, for example, from the same assembly, but only from a different phase or completely from a third-party source 220 (V ).
We connect the phase to terminal C2 of the PH47 release, and from terminal C1 we make a jumper to the terminal of the normally open contact of the control key or button. From the other terminal of this contact we make a jumper to the zero bus N.
An example of a circuit board with power supply of the RN47 release from a third-party source of 220 (V).
For interest, we will check the operation of the RN47 release paired with a three-pole automatic device.
And here everything is the same. When the control key is turned (contact closure), the shunt release is triggered, thereby opening the circuit breaker.
Conclusion
The advantage of the RN47 shunt release is undoubtedly the simplicity of its connection diagram and compactness.
As I said at the beginning of the article, the release takes up only one module in the switchboard. This advantage mainly applies to those who have limited space in the shield for additional devices.
Also, the RN47 release has a simple wiring diagram, and, as it turned out, with protection against prolonged exposure to voltage on the solenoid coil.
Well, we smoothly moved on to the shortcomings, about which I have nothing special to say, only if we mention its cost, which at the time of the article's release is about 1,100 rubles.
Again, how to look at this situation ?! For example, I purchased one complete RN47 device with the size of one module, connected by the simplest scheme and it's ready for use.
In the case of the circuit on the contactor, which I mentioned at the beginning of the article, then it is somewhat more complicated there, because first it is necessary, then to embed the contact from the fire alarm panel into the power circuit of the contactor coil. In addition, it is necessary to connect the power contacts of the contactor to the machine and the load cable, and this is again additional extra connections in the circuit.
The contactor itself has dimensions incommensurate with the RN47 shunt release, even if we take into account the dimensions. And in general, the contactor at the time of operation has an inherent property, like "hum", naturally, within reason.
And how much will it cost us to assemble a circuit on a contactor with control buttons ?!
I will not say for sure, tk. this will all depend on the manufacturer chosen, as well as the power of the contactor itself. After all, the RN47 release does not matter - it can turn off the machine with a rated current, at least 2 (A), at least 100 (A). And in the case of a contactor, it will need to be selected for the power of the load, and the more powerful the load, the more in size and cost the contactor will cost you.
If you have been using such shunt trip units for a long time and in the process some shortcomings have come to light, then you can tell about them in the comments. Thank you in advance.
Video on the material of the article:
P.S. And when modular machines have already been published, which can not only be turned off remotely, but also turned on. As far as I know, IEK is already developing in this direction. So let's wait. And this is where I conclude my article. Thank you all for your attention, see you soon!
