What is Medium Voltage Circuit Breakers?


Medium Voltage Circuit Breaker

A medium voltage circuit breaker is an automatically operated electrical device designed to protect an electrical circuit from damage caused by overload or short circuit.Its basic function is to interrupt a high momentary current flow. Unlike a fuse,which operates once and then must be replaced,a MV circuit breaker can be reset to resume normal operation. Control and detection of the main circuit to be protected is provided by an external relay.

How Medium Voltage Circuit Breaker (MVCB) works?

A circuit breaker uses a mechanical means to separate two contacts in an arc quenching medium to interrupt the flow of electricity.

Several different type of arc quenching technologies are available-
Vacuum Interrupters
SF6 interrupters
Air magnetic

Two main type of mechanisms-

Components of MVCB

1.Upper contact terminal
2.Vacuum interrupter
3.Epoxy resin enclosure
4.Lower contact terminal
6.Movable contact assembly
7.Contact force spring
8.Insulated push rod
9.opening spring
9.Travel adjuster
10.Transmission rod.
11.Main shaft
12.Operation assembly
13.Mechanism frame