switch is a basic electronic component, a key component that can open a circuit, interrupt current or allow it to flow to other circuits, flexibly adjust the operating state of the circuit, ensure that the device gets power when it is needed, and cut power when it is not needed, to save energy and protect the device from potential damage. Its function is to control the current in the circuit, so as to realize the start, stop, switch state and other operations on the appliance or system. It changes the connectivity of the circuit by physical contact or non-contact, and is the bridge between connecting and disconnecting the power supply and the load.

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