How to connect a Thermal Relay for an Electric Motor. The device and diagram of a thermal overload relay.

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Published on Jan 28, 2024
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#thermalrelay #relay #overload In the educational film, I talk about the device and operating principle of a thermal overload relay, which is used to protect an electric motor from overload, unphased mode. The operating principle of a thermal relay is based on heating a bimetallic plate when a current greater than the nominal one passes through. We connected the motor through a contactor (starter), it will rotate, but it is not at all protected from overload or phase loss. There is a device - a thermal relay, it is connected to the contactor, and the electric motor, accordingly, is connected to the output terminals of the thermal relay. The load current passes through the relay, and now you will see how it works. So, let's start the connection. We connect the phase terminals to the output terminals of the contactor. From the terminal of the normally closed contact, I lay the wire to the terminal A2 of the contactor, this is the output of the electromagnet coil. Let me remind you that there is also a parallel output A2 at the top. So, I connected one neutral wire to the thermal relay, now I disconnect the old neutral wire from the contactor and connect it to the relay. Now the neutral wire goes from the busbar, through the normally closed contact of the relay to the A2 terminal of the contactor. Nothing is connected to the upper terminal of A2. All that remains is to connect the cable going to the electric motor to the thermal relay. I press the Start button. Now voltage is supplied to the motor through the contactor and the thermal relay. When the load is exceeded or in an unphased mode, the relay is triggered and breaks the circuit of the neutral conductor going to the electromagnet coil.

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