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Leave a comment. Switchgear refers to electrical tool that regulates the flow of electricity within an electrical system. It is used by utility providers and hidden facilities alike for two reasons: to prevent overloads and short circuits, and to de-energize circuits for testing and maintenance.
However, the energy in the relay or solenoid âopposes the original change in magnetic fluxâ, which is now trying to collapse. The coil can do this only by keeping the current flowing across the gap in the switch. The only way it can do this is by creating a Back EMF high enough to generate an arc across the gap.