The 645NH is a double-pole momentary toggle switch with an insulated black polyamide lever designed for high-amperage panel-mounted applications. It features a 26° angle of throw and momentary function on the first pole with maintained ON positions on the second and third poles, providing versatile switching configurations. The switch is rated for 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 is approved to UL 1054, CSA 22-2, and EN 61058-1 standards, with an electrical life of 10,000 cycles at full load and dielectric strength of 2,000 Vrms between terminals and 2,500 Vrms between terminals and frame. The 645NH is commonly used in industrial control panels, machinery, and equipment requiring reliable high-current switching with momentary operation capability.