Why the high-voltage circuit is equipped with isolation switch and circuit breaker
The disconnector has a clear break point, but only acts as an isolated circuit and can not be operated when the line has current. When disconnecting the circuit, be sure to disconnect the circuit breaker and disconnect the disconnector.
For the safety of electrical work, in the front of the circuit breaker should be installed disconnector.
The circuit breaker has an overload protection function that can operate with current. But the contact is covered by the arc extinguishing device, the break point is not visible.
So the isolation switch installed in front of the circuit breaker, open, so that between the power supply and the circuit breaker has a clear point
The high voltage isolating switch is designed to be able to secure a safe disconnect from the power point when the circuit breaker is overhauled
