Load isolation switch to be placed on the back of the total circuit breaker

The main function of isolation switch is used for maintenance, repair parts of the charged part and there is a clear disconnect, no arcing device, cannot disconnect the short circuit current and load current; as for the installation at the front and back of the circuit breaker, my analysis is: 1, when the misoperation caused arc and short circuit, due to circuit breaker installed in the isolation switch front, circuit breakers will promptly tripping, which can avoid the accident; 2, if the occurrence of misoperation, isolating switch arc production can not be extinguished, if the circuit breaker fails to trip automatically, the operator can timely open circuit breaker, isolating switch loss after the power production will automatically extinguish arc. So the isolation switch should be installed at the back of the circuit breaker. There is a case is that if the power distribution cabinet installation of reactive power compensation device, usually from the circuit breaker outlet test T, when the open circuit breaker, then open the isolation switch, the residual voltage of the capacitor will be cut off. Also the isolation switch is installed in the circuit breaker in front of the power distribution device, the load control is generally used contactor control, does not appear with load pull gate phenomenon. .