Thermal relay protects three-phase motors
An
E-T-A Circuit Breakers product story
Edited by the Engineeringtalk editorial team
Aug 8, 2003
A novel compact relay will simultaneously disconnect all three phases of a three-phase motor in the event of overheating in the motor windings.
A novel relay is designed to simultaneously disconnect all three phases of a three-phase motor in the event of overheating in the motor windings.
PCB mountable, the compact relay offers a cost effective and highly reliable motor protection solution with optional status indication.
The E-T-A 3620 thermal relay has been designed specifically to provide cost-effective protection of three-phase motors and thus protection of the equipment in which they are fitted.
All four poles of the relay are disconnected simultaneously within 30s of a motor winding temperature sensor sending a signal to the relay.
Thus all three phases of the motor supply can be disconnected at once.
The fourth pole can be used for remote signalisation.
The use of a single 3620 provides an elegant and controlled solution, based on temperature rise, to prevent motors overheating and possibly burning out.
Instead of requiring additional electronics, to break the second and third phases and to provide signalisation, the compact relay provides simultaneous three-phase disconnection and clearly defined status indication.
The 3620 is rated for auxiliary circuit currents of up to 10A per phase at 400V AC.
Two versions are available which enable resetting within an 80s period at 23C.
The standard E-T-A 3620-10 has an integral manual reset button, whereas the E-T-A 3620-20 automatically resets itself after a controllable delay.
The relay has a footprint of just 35 x 35mm.
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