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The working principle of a DC isolator switch is quite simple. The switch is installed in a DC electrical system, typically between the PV panels and the inverter or charge controller. When the switch is in the “on” position, it allows the flow of DC current through the system. When the switch is in the “off” position, it interrupts the flow of current, effectively isolating the PV array or other DC source from the rest of the system.

The DC isolator switch consists of a set of contacts that can be manually opened or closed. When the switch is closed, the contacts are pressed together, allowing current to flow through the system. When the switch is opened, the contacts are separated, breaking the circuit and stopping the flow of current.

DC isolator switches are typically designed with a number of safety features to prevent accidental operation and to ensure that they can withstand the high voltages and currents present in DC electrical systems. These features may include lockable handles, visible isolating contacts, and weatherproof and UV-resistant enclosures.

Overall, the working principle of a DC isolator switch is to provide a means of safely isolating a DC electrical source from the rest of the system for maintenance, troubleshooting, or emergency purposes.