Siemens 3RT2017-1BB42 Industrial Three Phase Contactor

The Siemens 3RT2017-1BB42 is a compact three-pole power contactor from the Sirius 3RT2 family, engineered for AC-3e/AC-3 duty with a 24 V DC control coil and a 12 A continuous current rating that can switch up to 5.5 kW at 400 V for three-phase loads. It provides three normally open (NO) main contacts and one normally closed auxiliary contact (NC), all wired via screw terminals, and it ships in the small S00 size for easy panel mounting. Typical uses include starting and stopping three-phase motors in industrial control circuits, with the auxiliary NC contact available for interlock, signaling, or control logic. This model, 3RT2017-1BB42, is a direct-match for Siemens' Sirius lineup and is designed for compact installations where wiring space is limited.