JUNGHYUN ELECTRIC CO.,LTD.

A Vacuum Circuit Breaker (VCB) is a circuit breaker with a vacuum interrupter (VI) that uses a vacuum as the arc suppression medium. It is an important protection device with the responsibility of automatically shutting off the power system in case of a failure, in addition to intentionally performing power transmission/reception, switchover, and stopping.

An Air Circuit Breaker uses air as the arc suppression medium and is an important protection device with the responsibility of automatically shutting off the power system in case of failure, in addition to intentionally performing low voltage system power transmission/reception, switchover, and stopping.

It is a switch that automatically switches to the standby power supply in case of a power outage of the main power (regular power) or when the voltage is below the standard value by securing the power dually.