The 645H is a double-pole momentary toggle switch with an insulated lever designed for high-amperage panel-mounted applications. It features a robust mechanism with a 26° angle of throw and is rated for up to 15 A at 250 VAC with an electrical life of 10,000 cycles at full load. The switch has an initial contact resistance of 10 mO maximum, insulation resistance of 1,000 MO minimum at 500 VDC, and dielectric strength of 2,000 Vrms between terminals and 2,500 Vrms between terminals and frame. It is UL, CSA, and NF-VDE (EN 61058-1) approved, making it suitable for industrial control panels, machinery, and equipment requiring reliable high-current switching with momentary operation.