The main function of the isolation switch

Update date:2018-03-18 Source:MAXGE

Switch disconnectors are mainly used in low-voltage equipment for residential, building and other low-voltage terminal distribution systems. Main function: Split and connect lines without load.


1. For isolating the power supply, disconnect the high voltage inspection equipment from the live equipment, so that there is a clearly visible disconnection point.

2. The isolating switch cooperates with the circuit breaker and performs the switching operation according to the needs of the system operation mode to change the system operation wiring mode.

3. Used to turn on or off the small current circuit.


The isolating switch is mainly used to reliably isolate the part that needs to be cut off from the live part in the high-voltage power distribution device to ensure the safety of the overhaul work. The contacts of the isolation switch are all exposed in the air, have a distinct disconnection point, and the isolation switch does not have an arc extinguishing device, so it cannot be used to cut off the load current or short-circuit current. Otherwise, the breaking point will generate a strong arc under high pressure. , And it is difficult to extinguish itself, and may even cause arcing (relative to ground or short-circuit), burning equipment, endangering personal safety, this is the so-called "with load pull isolation switch" serious accident.


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