Each device that functions as a protective mechanism for electrical networks in the home has a shunt release for the circuit breaker. Such a device implies a mechanical connection with the switch and is considered built into the machine.

The task of this device in an automatic device is to help disconnect the electrical network in the event of an approaching negative factor, such as a short circuit or current leakage from the device itself or household units.

Attention! Use the equipment strictly in the specified temperature conditions. Deviation from the norm is not recommended.

In fact, scientists have registered a large mass of cases why the shunt trip tripped, but the most common and most often encountered in front of you:

• decrease in voltage in the electrical circuit;
• increase in voltage, change in the state of the current;
• changing the specified characteristics;
• incomprehensible failure and dysfunction of machines.

Shunt release

For so many reasons, modern devices are usually equipped with several mechanisms that allow a favorable disconnection of the network. They are made mainly from electromagnetic and mechanical, sometimes electronic particles. The release of the circuit breaker will allow you to leave all existing equipment in the household intact. It is customary to divide these built-in devices into two types.

Types of built-in releases

The first variety is household. Their mechanism is triggered exclusively by the voltage that passes through the main circuit of the circuit breaker. Such devices are capable of working remotely, unlike other protective systems for electrical networks. The release actively helps to disconnect from the network all devices and sources that regularly consume power, in the event of a noticeable voltage deviation from the specified norm. However, such an installation also has a drawback that converts the loss of energy into heat release and conducts it through the insulating conductor. Sometimes this factor will lead to incorrect disconnection of the circuit breaker.

In the piggy bank electrician! Watch the characteristics of the mechanism, in some cases deviations from the norm may be observed.

Release appearance

In the latest designs and systems, this drawback is eliminated due to the presence of a bimetallic plate, which were not previously used in the formation of an automatic protective device. This helps prevent the machine from overheating.

Procedure for checking the operation of circuit breakers

Often there are disputes that require clarification of how to properly check the performance of the releasers, in particular, amateur installers are interested in this, that is, people who manage on their own when installing automatic equipment.

• First, carry out a visual check, that is, inspect the entire box. It is important that the body is intact with no deformation;
• Try the switch key, make sure that it takes shape without difficulty in the on position, also in the opposite meaning;
• It is required to carry out a loading, in other words, a check of the automatic device for the disconnection of the network under unfavorable conditions. This experiment is carried out on specialized equipment under the guidance of experienced electricians. With the help of certain abilities, the operation time of the release from the moment the overvoltage arrives is elementary.
• Free the trip unit from the walls of the case and observe it under the influence of the equipment. When a current leak occurs, the plate should heat up and deform in a fraction of a second, and this is a signal to turn off the machine lever.

Attention! Checking circuit breakers for operation should be carried out strictly in overalls and under the supervision of an experienced specialist.

When checking the thermal response, the time during which the machine will go into the off state under the influence of voltage is recorded.

Induction coil release

What is the purpose of the release? First of all, its tasks are considered to be the implementation of protection in relation to the electrical network from voltage, which may even in the minimum indicator, but exceed the value of the rated current indicated in the device's passport. Do not forget to pay attention to the class of the device, it indicates at what stage the supply of electricity through the circuit should stop.

Hello, dear readers and guests of the "Notes of an Electrician" website.

In this article, I will continue talking about modular releases and today the next step is the RN47 shunt release.

And already by tradition, first I will make a brief overview of the RN47 shunt release, tell you about its scope, technical characteristics and 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.

Shunt trip unit RN47 is required for remote tripping of a 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 shops, 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 contactor coil switching circuit.

I do not argue that both options have the right to life, but with the use of a shunt release, this is much easier, more compact and even cheaper.

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 releases have been increasingly used in many residential buildings. In the event of a fire, an impulse from the fire alarm panel comes to the shunt release, which in turn turns off the automatic power supply of the electromagnetic door lock.

I have given 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 on-off cycles (VO) - 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 on 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 case 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 circuit breaker VA47-29 looks like, assembled with an RN47 shunt release.

A three-pole circuit breaker is mated in the same way.

Attention! The spatial arrangement of the circuit breaker with a 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.

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 the control key is turned (its contact is closed), the shunt release trips 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 won't 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.

In general, the electrical circuit of the shunt release is very simple - it is a coil connected via a microswitch contact and two terminals for connecting the release to an AC voltage source.

Therefore, there will be no mistakes 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 the C2 terminal of the PH47 release, and from the C1 terminal 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 an external 220 (V) source.

For interest, we will check the operation of the RN47 release paired with a three-pole automatic device.

And here everything is the same. By turning the control key (closing the contact), 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 and compactness.

As I said at the beginning of the article, the release takes only one module in the shield. 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 has already 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 1100 rubles.

Again, how to look at this situation ?! For example, I purchased one complete PH47 device with the size of one module, connected it according to the simplest scheme and it is ready for operation.

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 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 exactly, 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. Thanks 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!

", here I want to tell you how to correctly connect the S2C-A1 shunt trip unit from ABB. Of course it is not used at home, since it is not necessary, but you can meet with it at work, in the office, etc. It is used to de-energize panel of air conditioners and other electrical equipment when a "Fire" signal from a fire alarm appears. Therefore, this article may be useful to you. I was prompted to write it by the incorrect connection of this release by installers in our panel. Also, after looking at the Internet, I realized that this problem occurs quite often. The forums often write that the release does not turn off the input circuit breaker, because there is not enough current for it. This is fundamentally not true. This release may not disconnect the input circuit breaker only because of the poor competence of the installers in working with these devices.

A few words about the device itself. Shunt release S2C-A1 is designed for remote tripping of protective devices. It connects to ABB S200 series circuit breakers and DS200 series difavtomats. Usually it is connected to the input automatic devices for the possibility of remote shutdown of the entire power supply panel.

There are two types of release according to the voltage level of its coil. These are S2C-A1 and S2C-A2. Their abbreviations differ only in the last digits. The S2C-A1 requires a direct or alternating voltage of 12 to 60 V. Usually this voltage is taken from fire alarm devices. The S2C-A2 requires a constant or alternating voltage from 110 to 415 V. As you can see, the difference is only in the voltage level. These types of releases are connected to the circuit breakers only on the right side. If suddenly, for some reason, you need to connect the shunt release to the machine on the left side, then you already need to order S2C-A1L or S2C-A2L. This is indicated by the last letter "L" in the designation.

The shunt release connection diagram is very simple. He has only two contacts to which the wires are connected. But installers often miss one trifle, because of which the circuit does not work and the shields do not de-energize.

I'll tell you about our case. It all started with the fact that when a fire signal was sent to S2C-A1, he did not turn off the input automatic device, but something clicked in the release inside. One got the feeling that he simply did not have the strength to move the handle of the machine.

Below is a photo of the introductory circuit breaker of our air conditioning power panel. It is a 3-phase circuit breaker with an S2C-A1 shunt release connected on the right side.

It was decided to dismantle all this economy in order to find an answer to the question: what could be the matter?

S2C-A1 is detached from the machine with little effort. To do this, you need to pull them in different directions. For help, insert a slotted screwdriver between them.

It turned out that this shunt trip acts on the machine only through a thin metal pin that connects their control knobs. This is not enough to turn off the machine remotely. Do you yourself try to turn off the 3-pole circuit breaker by hand? Here you need strength. Therefore, the automaton must be affected by something else that is not here.

It turns out everything is simple. As the people say: "It was not the bobbin." There was no harmless little plastic fork. Against the background of these powerful devices, she looks somewhat helpless.

Its length is about 16 mm.

This plug must be inserted into both devices in the special grooves. On the machine, this groove is initially sealed with a round plug. It can be easily removed with a screwdriver.

I cocked the machine gun and with a screwdriver slightly pressed on its mechanism through the open hole and the machine immediately turned off. Hooray! It remains to find such a fork.

As it turned out, it is not sold separately and you only need to buy a new S2C-A1 release, which costs about 1250 rubles. It was useless to look for the old one, since it has been in the trash for several months. Where to go - bought.

ABB's S2C-A1 shunt trip is sold in plastic packaging. The fork we need is in the same package, but in a special compartment. Be careful!

You can clearly see it in the bottom photo.

When the installers open the package, the fork flies away and no one has any problems. Something like this! These are our installers!

I do not understand why, during the development of this device, it was impossible to foresee its initial attachment to the release. That is, to make it so that it is one with this fork and it does not disconnect from it. He already has three pins sticking out. We would have done the fourth and there would have been no problems. Or at least write a warning on the packaging in big letters: "Attention! There is a small thing inside! Don't lose it!"

Everything is ready for assembly ...

This fork has a triple fork on one and a double fork on the other. So, the triple plug must be inserted into the machine itself. She sits well there. And the double plug must fit into the S2C-A1 release.

It looks something like this ...

Snap in and you're done!

Retesting the shunt trip with the plug installed showed that the S2C-A1 very easily and quickly bounces off a powerful three-phase circuit breaker. As you can see, more current is not needed here, as advised in some forums.

Thanks for attention!

Let's smile:

Strange people are electricians!
They stand on the ground and look for the ground!

I never wrote about releasers, because I thought that everything is 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! \u003d)

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 that go with 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 to simulate the triggering of automatic devices in a carriage - this is used to train various emergencies (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 trip and shut down. 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's 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 make the control signal a pulse. Just in case.

Well, the third option is to untie everything that we want using intermediate relays, of course. And signal inversion, if necessary, and 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 the 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.

Here, it was initially thought that the fan coil units would 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!

This is an external version of the circuit breaker release - an additional device designed for manual or automatic remote control of the circuit breaker.

Perhaps the most common example of their use today can be called the use in protection and control circuits of ventilation systems - the initiation of the operation of a circuit breaker supplying the ventilation system when a fire detector is triggered.

Turning off the machine, in the example given, in the event of a fire, will de-energize the electric motors that blow air into the room.

Structurally, the devices are quite simple. Their main element is a coil (solenoid) with a core (stem) inside. Applying a control signal to the coil - a working one, as a rule, with a fairly wide voltage range leads to the retraction of the core, which affects the circuit breaker mechanically connected (through a special lever) with an external release (or, depending on the design of the machine, built into it).

As you can see, the scheme is not particularly complex. The device is triggered when the contacts of the sensor or button are closed.

Please note that in the proposed scheme, the release coil is powered from an automatic machine, in conjunction with which the device works. It is very important that the circuit breaker breaks the power supply circuit of the shunt release coil when it is disconnected.

The fact is that the voltage applied to the coil for a long time can simply burn it out and the release will fail. Some modern devices have protection in the form of microswitches that open the coil supply circuit in the off switching position.

Using the scheme proposed here, you can protect the release from failure: when the machine is turned off, the supply phase voltage will be guaranteed to be removed from the contact of the solenoid coil of the device.

The diagram above shows the possibility of implementing remote shutdown of several machines. In both schemes, the circuit breakers are single-pole, however, using shunt releases, you can also control a three-phase load using three- and four-pole circuit breakers.