The 639H is a single-pole toggle switch from the 600H-600NH series featuring a metal lever with a 36° throw angle and screw terminals. It is designed for ON-OFF-ON electrical function with robust mechanism and high current/voltage rating capability. The switch carries a maximum current rating of 15 A at 250 VAC for ON-OFF function with 10,000 cycles electrical life, and supports peak current of 30 A during 1/2 sine at 250 VAC. It features 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. Operating temperature range is -20 °C to +55 °C with a polyester UL94-V0 case, brass nickel-plated actuator and bushing, and silver/nickel alloy contacts. This switch is ideal for panel-mounted applications requiring reliable high-amperage switching in industrial control systems, power distribution panels, and equipment requiring durable ON-OFF-ON functionality.