Miniature circuit breakers used to protect control circuits or small appliances may not have sufficient interrupting capacity to use at a panel board; these circuit breakers are called " supplemental circuit protectors " to distinguish them from distribution-type circuit breakers.
12.
A circuit breaker controls the lamp and alarm bell in the locomotive cab; in cases where defective equipment causes the lamp and bell to go off, the driver can disable them by placing the MCB ( miniature circuit breaker ) in the " Off " position.
13.
In these miniature circuit breakers, the current is run through a solenoid, and, in the event of excess current flow, the magnetic pull of the solenoid is sufficient to force open the circuit breaker's contacts ( often indirectly through a tripping mechanism ).
14.
Therefore, RCDs are often used or integrated as a single product along with some kind of circuit breaker, such as a fuse or miniature circuit breaker ( MCB ), which adds protection in the event of excessive current in the circuit ( RCBO, " RCD w / overcurrent protection " ).
