Thermal Overload Relay

We know that ensuring the integrity of an industrial process is extremely important, it is necessary to think about devices that help protect it. As an electric motor is the most important machine in a process, there needs to be protection against a possible overload in it, as we will talk about thermal overload relay.

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The thermal overload relay is a protection device that is responsible for protecting electric motors from possible anomalies. The most common are electric motor overheating.

When the motor locks its shaft or is working with a lot of loads, it requests more current from the network to try to compensate for the required weight, so the motor ends up having to work with specifications that do not fit it. So there can be damage to its coils causing heating and even a probable melting of its insulation, an action that is capable of closing a possible internal short circuit.

It is at the moment where the possible heating is taking place that the relay comes into action. When this overheats, the bimetallic blades with different temperature coefficients heat up, causing the blades to deform and causing them to activate the relay, disarming the motor circuit, as well as the control circuit through its auxiliary contacts.

This relay is a great protection component because once activated, it locks, preventing the motor from starting again. This way, the motor can only be started when a manual reset action occurs. See below for the main parts of a thermal overload relay.

This device manages to signal through the insertion of beacons and alarms or even provide a signal for the disarming of a circuit breaker.
The amount of current that a thermal overload relay supports can be adjusted in the equipment itself through a dial that is manually adjusted.
It has a test button, to identify if the component will work in case of an anomaly.

The thermal overload relay thus proves to be a very effective component that protects electric motors ensuring the integrity of their windings, in addition to being an easy-to-install component.