In photovoltaic applications, PV DC isolators are used to manually disconnect solar panels for maintenance, installation or repair. The solar panel dc isolator switch is an electrical safety device that can manually disconnect itself from the modules in the solar photovoltaic system. In electric power applications, circuit breakers and isolation switches are mostly used in combination, and the circuit breakers are used to switch and cut load (fault) current, and the isolator switch forms an obvious disconnection point. Only voltage transformers, lightning arresters, no-load transformers with excitation current less than 2A, and no-load circuits with current no more than 5A can be directly operated with isolation switches. It is strictly forbidden to operate with load to avoid serious equipment and personal accidents. Therefore, the isolation switch can only be operated when the circuit has been disconnected by the circuit breaker. Because it has no special arc extinguishing device, it cannot cut off the load current and short-circuit current. It can reliably pass the normal load current and short-circuit fault current in the closed state. It is a switchgear without arc extinguishing device, mainly used to disconnect the circuit without load current, isolate the power supply, and have an obvious disconnection point in the open state to ensure the safe inspection and repair of other electrical equipment. Isolator switch is a high-voltage switchgear, mainly used in high-voltage circuits.
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