The 637NH/2 is a single-pole toggle switch with an insulated black polyamide lever and solder lug terminals, designed for high-amperage panel-mount applications. It features a 33° angle of throw with momentary-off/momentary electrical function, providing OFF in the center position and MOM in both the up and down positions. The switch is rated for a peak current of 30 A maximum during 1/2 sine at 250 VAC, with an initial contact resistance of 10 mO maximum and insulation resistance of 1,000 MO minimum at 500 VDC. It offers dielectric strength of 2,000 Vrms at 50 Hz between terminals and 2,500 Vrms at 50 Hz between terminals and frame, with an electrical life of 10,000 cycles at full load. The switch operates over a temperature range of -20°C to +55°C and is approved to UL 1054, CSA 22-2, and EN 61058-1 standards, making it suitable for industrial control panels, machinery, and equipment requiring robust momentary switching functionality.