The 2GK721-D-3B-B is a nylon toggle switch from Carling Technologies' G-Series, designed for reliable switching applications with single or double pole configurations. This switch features a slow-make, slow-break contact mechanism and is rated for 20A at 250VAC operation, with a dielectric strength of 1,000V minimum and insulation resistance of 100 Megohms minimum. The switch incorporates a nylon bushing and black nylon actuator, with a 15/32-32UNS-2A thread and keyway dimensions of 0.072 inches [1.82 mm]. It is certified by UL, CSA, and VDE, ensuring compliance with international safety standards. This switch is commonly used in industrial control panels, appliances, and equipment requiring reliable on-off switching with maintained contact positions.