These Tork P47 on/off trippers are replacement parts for astronomic or scheduled mechanical timers used to control lights, appliances, and machinery. These trippers are for use with NSI Industries' 1100, 7000, and 1800 series timers, or they can be used for new cycle timers within the correct series for flexibility in custom installations. This replacement pack includes one on tripper and one off tripper.

NSi Industries manufactures electrical components and sensors, lighting products, and energy management products. The company, founded in 1975, is headquartered in Huntersville, NC.