The Schneider K1D024MLH is a voltmeter cam switch with a stable position of 4 and a current rating of 12A. It is designed for use with an 0-L1L2-L2L3-L3L1 circuit, which means that it supports switching between multiple levels of voltage. This switch is designed to isolate the circuit from the power source when all levels of voltage have been switched off. It is also designed with a safety switch to avoid electric shocks or other related hazards.