Cam switch 16A, circuit switch 0-1-2-3, mounted to the desk gray front black knob. Cam switches are electric rotary multi-circuit switches adapted to switch on and off currents. Cam switches are used in the circuits of low voltage electrical installations, especially as circuit breakers, disconnectors, switches and control switches. Cam switches can be installed indoors (pollution degree 3 - industrial use) at -40...+70°C.