Miniature circuit breakers (MCBs) are fitted as protection units - TopicsExpress



          

Miniature circuit breakers (MCBs) are fitted as protection units in place of fuses. They have the advantage that they can be manually reset without having to replace wire as in the case of the traditional fuse. The MCBs have either a button or lever that can be flicked to reset it. The MCB tripping is an indication either that the circuit has been overloaded or that a short circuit has occurred somewhere in the system. Depending on their type they can rated for different applications - B type - General Domestic Consumer Unit use C type - Motor Rated And others - Inductive, Capacitance, Reactive loads, etc. The Motor Protection Circuit Breakers (MPCBs) provide short circuit protection, overload protection, and motor disconnect functions. The MPCBs may be combined with a magnetic contactor to provide 2 component combination starters and with the addition of an overload relay. They generally provide contacts to indicate position (Trip, Not Tripped) and also axillaries contacts normally open closed - Operational range usually from 0.11 A to 100 A and this is usually adjustable from the front of the unit as opposed to MCB which are generally set. They are also more expensive -
Posted on: Sat, 04 Oct 2014 04:55:25 +0000

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