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Molded case circuit-breakers (MCCB)

Keywords
MCCB, protection against overcurrents, devices, circuit breaker, tripping characteristics, breaking currents, trip unit
Abstract

Accessories for switchgear materials

Switchgear protective devices like MCCBs and MCBs support the addition of extra accessories.
ElectricalDesign 16.5 allows you to add accessories modules to switchgear materials used in a circuit.

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Among the devices used as protection against overcurrents, there are circuit breakers which, in case of fault, open the circuit in a mode depending on their tripping characteristics and on the overcurrent value.
The circuit breaker is a mechanical switching device, capable of making, carrying, and breaking currents under normal circuit conditions and also, making and carrying for a specified time and breaking currents under specified abnormal circuit conditions such as those of short circuit.
Each circuit breaker is equipped with a trip unit which actuates the circuit breaker release mechanism and allows opening on the basis of the current flowing through it.
Two types of trip units are used in low voltage circuit breakers:

Thermomagnetic trip unit

Electronic trip units

MCCB series title=

MCCB series (SOURCE: Hager)

TiSoft,