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Forward/reverse rotation control of electric motors
Figure 1 shows an example of forward/reverse rotation control of an 
electric motor, in which magnetic contactors control the forward/reverse 
rotation. The molded case circuit breaker (MCCB) is a device that breaks 
and protects the circuit aganinst an overcurrent or short circuit. It can 
open and close larger current than magnetic relays, and interlocks main 
contacts with auxiliary contacts.

When the MCCB is closed, and the forward rotation switch (PBS1) is turned 
on, the main contact of the forward magnetic contactor (F-MC) closes and the 
motor rotates forward. At the same time, the auxiliary contact (F-MC-a) 
closes and forward rotation switch is self-held, and the similar auxiliary 
contact (F-MC-b) opens and the reverse circuit is interlocked. When the 
stop button switch (PBS3) is pressed, the magnetic contactors are reset, and 
the motor stops.

If there is no interlock circuit and the both magnetic contactors work 
simultaneously, the R-phase and the T-phase are short-circuit, and a large 
short-circuit current flows, leading to a burnout accident. 

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