The 644H/21R is a double-pole toggle switch from the 600H-600NH series designed for high amperage panel-mount applications. It features a metal brass lever with nickel plating, screw terminals, and an ON-ON electrical function with a 33° angle of throw. The switch is constructed with a polyester UL94-V0 case, brass nickel-plated bushing, and silver/nickel alloy contacts, providing robust performance and excellent contact reliability. It is rated for 15 A at 250 VAC with an electrical life of 10,000 cycles, operates across a temperature range of -20°C to +55°C, and meets UL 1054, CSA 22-2, and EN 61058-1 approvals. This switch is ideal for industrial control panels, machinery, and equipment requiring reliable high-current switching with durable mechanical construction.