Motor protection circuit-breakers
What is a motor protection circuit breaker? A motor protection circuit-breaker is an electric switching device that turns power off as soon as an overheating danger is suspected.
Magnetic-only circuit breakers switch off when a short-circuit arises in the motor, or somewhere in its supplying and controlling chain. Thermal-magnetic circuit breakers switch off in case of a short-circuit, and also when the motor is mechanically overloaded, or when the supplying line is electrically overloaded (for instance in case one of the three phases is accidentally disconnected).
To mitigate the main electrical risks of fire and burns, regulations in force make mandatory dedicated protection for every electric motor with rated power 500 W and above, which is achieved:
Either by a thermal-magnetic circuit breaker. Or by a magnetic circuit breaker (or a fuse carrier) combined with a motor protection overload relay or an advanced motor protection relay.
To mitigate the main electrical risks of fire and burns, regulations in force make mandatory dedicated protection for every electric motor with rated power 500 W and above, which is achieved: