Miniature Circuit Breakers

By 1 August 2017

During a normal operation, it works as a switch; while during overload or short-circuit condition, it works as a protection device, isolating the faulty section.

Miniature circuit breakers (MCBs) are used widely, as protective devices for switching and protection in domestic, commercial, and industrial applications. They are popular because they replace the conventional fuse-and-switch and give more flexibility.

Magnetic or thermal sensing devices provided within it actuate a tripping mechanism.

Typical voltage ratings: 240 V/415 V AC; 50 V/110 V DC
Typical current rating: 1–55 A