●Made of flame retardant PC material, good insulation performance, high heat resistance, and will not deteriorate over time ●Plate and rotary switch covers are removable, square plates, easy to control ●Universal cam replacement switch is convenient to replace damaged switches ●Connect an ammeter and voltmeter to measure another electrical circuit ●The switch is mainly suitable for power switches and asynchronous motors to activate, reverse and speed switches electrical wiring can also be converted to control circuits