L21MD03-3E20 is a non-illuminated selector switch featuring 3 positions with spring return action at 45° rotation and a black knob handle. The switch is equipped with 2 normally open (NO) contacts rated for AC15 at 10 A continuous current and DC13 at 2.5 A, with a rated insulation voltage of 690 V AC (IEC/EN 60947-1) and 600 V AC (UL 508). It supports electrical operating life of 1 million cycles under specified AC15 and DC13 conditions, with applicable wire sizes from 0.5 mm² to 2 × 2.5 mm² for rigid or flexible wires without ferrules. This selector switch is designed for industrial control panels and machinery requiring reliable position selection with automatic return to neutral, offering positive opening NC contact capability and compliance with IEC 60947-5-1 standards.