Reliance Controls 24-Hour Mechanical Time switches are used for controlling pumps and compressors, pools and spas, heating and air conditioning, commercial lighting and signs, or electric motors. Industrial grade high impact cabinets provide reversible door hinges for tight spaces and best-fit installation. Each model is a low-profile cabinet that has a lockable, tamper-resistant enclosure and inside cover instruction labels. Features up to 16 ON-OFF operations per day. With clearly marked terminals and circuit ID labels, installation and operation are seamless. Our 601P model is made from industrial strength polycarbonate and intended for outdoor use, NEMA 3R rated. Additional specs are SPST switch, 120V/60Hz/4W timing motor. Universal multi-voltage contacts 120-277 - 4 time switches in 1. Combination 1/2" - 3/4" nominal one on back and on each side and two on bottom (Note - Only the 600P series has reusable knockouts).