Molded Case Circuit Breakers (MCCB)
Molded Case Circuit Breaker
The circuit breaker is a mechanical opening- closing device, which is used for closing, breaking, separating circuit and carrying current of that circuit under ordinary conditions and for automatically breaking the circuit under extraordinary conditions like short circuit and overcurrent.
Operating Principle of the Circuit Breaker:
The most important function of the circuit breaker, in addition to opening-closing the circuit, is to protect the circuit under extraordinary conditions.
There are some units inside the device to let the breaker fulfill its protection functions.
Opening units of LV circuit breakers are described as release mechanism in TS EN 60947-2 standard.
-Over current releases (Over current opening unit)
-Under voltage releases (Low voltage opening unit)
-Shunt Trip releases (Remote release unit)
All the circuit breakers are equipped with over current releases. However, under voltage and shunt trip-release coil is not a standard accessory and added to the circuit breaker as per requirement.
Over Current Option:
All the values exceeding rated current value are called over current.