Miniature Circuit Breakers Switchgear

We supply huge range of Miniature Circuit Breakers Switchgear from Bengaluru, Karnataka, India. Miniature circuit breakers (MCB) are characterized by their low current ratings and fixed trip settings. Normally, MCBs have current ratings below 100 Amperes and, as their name implies, they have a compact size. There are three main types of MCBs, classified according to the current range at which they trip instantly.
Type B - Trips at 3 to 5 times rated current, suitable for resistive or slightly inductive loads.
Type C - Trips at 5 to 10 times rated current, suitable for moderate inductive loads.
Type D - Trips a t 10 to 20 times rated current, suitable for loads with a high inductive component.

Working Principle Miniature Circuit Breaker
There are two arrangement of operation of miniature circuit breaker. One due to thermal effect of over current and other due to electromagnetic effect of over current. The thermal operation of miniature circuit breaker is achieved with a bimetallic strip whenever continuous over current flows through MCB, the bimetallic strip is heated and deflects by bending. This deflection of bimetallic strip releases mechanical latch. As this mechanical latch is attached with operating mechanism, it causes to open the miniature circuit breaker contacts. But during short circuit condition, sudden rising of current, causes electromechanical displacement of plunger associated with tripping coil or solenoid of MCB.