Siemens 3TB5217-0A Three-Phase Motor Contactor Starter

Siemens 3TB5217-0A is a heavy-duty, three-phase motor starter contactor (frame size 4) designed for direct control of industrial motors up to 600 V. It is a 3-pole device rated for 135 A with a 120 V AC coil, enabling reliable switching from standard control circuits. The unit includes 2 normally open and 2 normally closed auxiliary contacts, providing flexible signaling and interlocking options for start/stop control and basic wiring in motor circuits. This Furnas Electric Co. lineage, now part of Siemens, is well suited for applications such as conveyors, pumps, and fans where compact, robust motor switching is required.