Thermal protection is used to guard the electric motor against overload. The basic working principle is similar to all other circuit breakers. The motor protection circuit breaker can be considered a subtype of a thermal magnetic circuit breaker, but with additional functions that are specially designed to protect electric motors. Motor Protection Circuit Breaker Working Principle 
An electric motor that is adequately protected with an MPCB will have a much longer service life. If a motor is not protected correctly, it may be necessary to carry out costly repair works or even replace the equipment completely.
Automatic Reconnection – Some MPCB models allow a cool down time to be input in case there is an overload, after which the motor will restart automatically.Įlectric motors are expensive equipment, so the role of the motor protection circuit breaker is very important. This is a visual indication for nearby personnel that a fault has occurred and the electric motor must not be connected again until the fault is addressed. Fault Signaling – Most models of motor protection circuit breakers have a LED display that is turned on whenever the MPCB has tripped. Motor Circuit Switching – MPCBs are normally equipped with buttons or dials for this purpose. An overheated motor can be permanently damaged if it is turned back on. Thermal delay to prevent the motor from being turned back on immediately after an overload, giving the motor time to cool down. Both conditions can severely damage a three-phase motor, so the MPCB will disconnect the motor in either case as soon as the fault is detected. Protection against phase unbalances and phase loss. Overload protection is normally adjustable in MPCBs. Motor overload protection, when a motor draws electric current above its nameplate value for an extended period of time. The MPCB can interrupt any electrical fault that is below its breaking capacity. 
Protection against electrical faults such as short circuits, line-to-ground faults and line-to-line faults. It has several functions that allow it to provide a safe electrical supply for motors: 
A motor protection circuit breaker, or MPCB, is a specialized electromechanical device that can be used with motor circuits of both 60 Hz and 50 Hz.
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