Wiring diagram for 3-phase voltage control relay for home

The task of circuit breakers is to protect against overloads and short circuits, and the RCDs installed with them protect against current leaks. But, these devices are effective only in single-phase networks, but there are also three-phase networks with their own operating characteristics. To prevent possible negative consequences, in such networks a three-phase voltage relay is used, which is triggered when a phase cable or neutral wire breaks, during pulse surges and other faults.

Application of devices

Three-phase voltage relay ZUBR 3F
Three-phase control relays are used to protect the electric motor from load in everyday life and industrial areas. They help to work correctly:

• air conditioning systems;
• refrigeration equipment;
• compressor units.

The device is indispensable for any equipment with an ATS circuit and other devices operating on an electric motor load. Helps avoid emergency situations.

Device Features

There are different types of relays. They are produced taking into account the needs of problematic networks in which power outages and interference are possible. The devices are capable of delaying if a voltage sag occurs.

The three-phase voltage relay is installed in the panel on a special DIN rail. It weighs very little and has simple settings.

Installation is carried out parallel to the load, but the operation does not depend on power. At the outputs, the relay is equipped with closed and open groups of contacts, which are independent of each other and switch loads up to 5A.

Entry 3

Below are photos of the assembly and installation of the shield on the third input.

3 – assembly process.

Pay attention to the color sequence of the wires. Question: Which country am I a patriot?

I decided to use a flexible PVS 4x4 cable, because I had suffered in the first previous cases with solid cores. But in this case it is necessary to use tips, because... for screw terminals, which are used in Barriers, the strand is not comme il faut.

3 – Electrical panel assembled and installed

In the previous two versions, the wires went from top to bottom under the DIN rail, which is a little annoying.

Therefore, here I expanded the consciousness and the distance between the phases, and laid wires into the resulting gaps. The fact is that the Barrier block occupies approximately 2.8 modules on the DIN rail, and there will be gaps in any way. So why not use them for convenient installation?

3 – Shield with Barriers installed

3 – General view

3 – Complete

Principle of operation

The principle of load distribution between consumers
The operation of the device is based on the principle of self-return. If an emergency occurs, the equipment is switched off. When the relay receives three-phase voltage, it checks all parameters. If everything is normal, the built-in electromagnetic device turns on.

If there are malfunctions, the relay turns off, and after the parameters return to normal, it turns on without delay.

During the entire service life, the device monitors the voltage level and turns off the load in the event of:

• loss of any phase;
• phase imbalance;
• phase rotation violations.

The device is designed to control the quality of electrical energy. It provides reliable protection of equipment from sudden changes in voltage in the network.

Product range

The three-phase voltage control relay is represented by the following model range:

• RNPP-311 - the device ensures the operation of the consumer under the condition of possible main types of accidents in the electrical network, such as exceeding permissible thresholds of mains voltage values, phase sticking or changing their sequence, full-phase failure;

• RNPP-311M – three-phase voltage control is performed under the same conditions as in the case of using the RNPP-311 device. However, the LED display panel in this model has been improved and, in addition to the presence of mains voltage, as well as the load state, indicates the type of emergency, which greatly facilitates subsequent user actions.

• RNPP-301 - in this modification, a three-phase voltage and phase control relay, ensures operation of the device in linear and phase voltage modes, has 6 potentiometers for setting parameters and adjusting the operation of the device.

• RNPP-302 - the device has a more advanced menu, which, in addition to the main functions, allows you to set a delay time interval in case of violation of the specified parameters, with the possibility of automatic start after restoration of acceptable network values.

• RNPP-311-1 - this device is two-channel and in addition to the main functions assigned to the three-phase voltage relay, it can control the network frequency.

• RNPP-311-2 is a two-channel device that monitors a 3-phase 380V/50Hz network with high accuracy, and is also equipped with signal indicators that provide information to the user about the full-phase network or partial phase loss.

The device comes with a warranty from the manufacturer, as well as full detailed instructions that will help the user to correctly install the device, maintain it in operation and correctly “read” the indications of the display panel.

Connection diagram and installation of voltage relay

Relay elements
The device will perform its functions regardless of the position. But each model has its own connection diagram. You can see it on the body.

For all devices, there are the same rules that are designed to control the process of connecting the relay to the electrical circuit.

The input contacts are connected to the network through a contactor or starter. The conductors of all phases are combined with the terminals, which are located on the top of the device. Elements are marked like this:

1. Phases with letters A, B and C.
2. N – neutral wire terminal.
3. 1,2,3 – lower terminals.

First, from terminal 1, the conductor is connected to the output of the coil, which is located in the contactor. Terminal 3 is connected to any phase. The second output is connected to the neutral conductor of a three-phase network.

The power elements are connected as follows:

1. Each phase that supplies current is connected to the input terminal of the contactor.
2. The conductors are connected to the output terminals.
3. To connect neutral conductors, a common neutral bus is installed in the distribution panel.

To ensure reliable contact, special tips are used.

How to read labels

When choosing a voltage relay, you need to learn how to correctly read the markings and understand them. Such knowledge is necessary so that upon purchase you do not receive a device with other technical characteristics.

All necessary markings are present on the device on its front side. The device indicates, first of all, the response thresholds, which are indicated in volts. There can be two of these values, provided that the voltage relay has the function of adjusting the lower and upper thresholds. Next, the device indicates the rated current. This value indicates the maximum current that can pass through the device. A prerequisite is to indicate the degree of protection and its power on the device body.

The 63A voltage relay DIGITOP MP-63 is a multifunctional and powerful device

Also, the terminal numbering must be indicated on the device.

RCD connection diagram

In apartments, connecting a three-phase network is rare. This option is popular for private homes. The protection device is connected in several ways:

• A 380 V 2-pole voltage relay is not suitable for home use. Use 4-pole analogues. 1 neutral conductor and 3 phase conductors are connected to them. The circuit is complicated by the fact that each line is equipped with its own RCD device. It is important to choose the right wires. For a single-phase network, the standard VVG version is suitable, but for a 3-phase network you need a fire-resistant VVGng.
• General RCD for 3-phase network + meter. The circuit contains an electricity meter. Group RCDs are located in the system for servicing individual lines. This scheme requires the installation of a large electrical panel with many wires and electrical appliances.

If an apartment or house has a large number of lighting and socket circuits, as well as a variety of household appliances, it is advisable to install double protection with a common RCD.

General settings of three-phase relay

In order for the 3-phase voltage control relay to work, you need to make some settings. After connecting the device to the electrical circuit, power is supplied to it, and the following information appears on the display:

• If the image on the display blinks, this indicates a lack of voltage.
• The appearance of dashes indicates a violation of the phase sequence or the absence of one.
• If the display flashes for a long time, you should suspect that the contactor is not connected.

You can set up a three-phase voltage control relay using two built-in buttons; they have triangles on them. They are located on the right side of the device: the top button with a triangle up, and the bottom button down. To get the maximum shutdown limit, you need to press the top button. She lingers for a few seconds. After this, a number appears in the central screen displaying the factory level. The button must be pressed until the desired value appears. After settings, the device will be automatically programmed within ten minutes.

How to set the restart time

On the right side of the display there is a control button with a drawn clock. It must be pressed and held until the factory value appears. The time interval is 15 seconds. This means that after the voltage normalizes, the device will turn on the electricity again after this period of time.

Indicators can be reduced. A few clicks on the top or bottom button are enough for the necessary parameters to appear.

How to adjust phase imbalance

To configure, you must simultaneously press both triangular buttons. After this, you can see 50V on the display. This means that power will not be supplied to the network when the phase imbalance reaches this value. To decrease or increase a parameter, you need to set the time of one of the buttons.

Features of common types of voltage relays

Types of voltage relays
Thanks to the voltage relay, during power surges the device will not burn out, the board will not melt, or the electric motor will not fail. The cost of the devices is considerable, but they pay for themselves. It is better to prevent accidents than to buy new equipment.

There are several types of control relays on the market from different manufacturers. They have the same principle of operation, although the design and set of additional functions may differ.

Modern devices have a digital display. It allows you to monitor the voltage level in three phases. There are also additional settings. With their help, they regulate the operation of the device and ensure simplicity and ease of use.

A three-phase voltage control relay is an indispensable thing in the household. It is not difficult to connect and configure. This will take no more than half an hour, after which all electrical appliances will be protected from voltage surges.

Model differences

As described earlier, the basis for the difference between phase control relays on the market is the breadth of capabilities. In this device, the digital component is not very important; a conventional electronic circuit is sufficient to monitor the network characteristics. But the ability to set the initial parameters for protection operation is often necessary.

Table of several models of phase control relays:

Note: the circuit breaker can also detect an error of incorrect phase rotation due to voltage imbalance, so correct installation of it in any type of design to a three-phase network is mandatory.

The above list does not include all the models that are widely used, but it allows us to estimate the average price of protection devices with the same functionality.