Siemens 3TF40-22-0BB4 Three Phase Industrial Contactor

Siemens 3TF40-22-0BB4 is a three-pole industrial contactor with a 24 V DC coil and main contacts rated for 380 VAC and 4 kW motor loads, complemented by a 20 A rating. It provides 2 normally open and 2 normally closed auxiliary contacts for signaling and interlocking within motor-control circuits. As part of the 3TF4 family, the contactor employs Siemens’ arc-quenching system in the arc chute to divert arcs away from contact surfaces and into splitter plates, extending life during frequent switching. This model is designed to switch three-phase induction motors in industrial control panels, commonly used for drives, conveyors, pumps, and fans.