Siemens AG 3RT2018-1BB41 Electrical Contactor

Siemens Sirius 3RT2018-1BB41 is a compact 3-pole power contactor (size S00) built for AC-3e/AC-3 motor control duties. It switches three-phase loads up to 16 A and 7.5 kW at 400 V, using three main normally open contacts and a 24 V DC coil, with an integrated auxiliary contact (1 NO) for signaling or interlocking and screw-terminal wiring for secure connections. Weighing roughly 0.29 kg, this 3RT20-series device is suited to space‑constrained panels and equipment such as conveyors, fans, pumps, and machine tools where reliable startup and shutdown of motors is required. The part number 3RT2018-1BB41 places it squarely in Siemens’ Sirius line of 3-pole contactors, designed for straightforward installation in compact control layouts, with the coil and contact arrangement tailored to standard control circuits and motor loads in industrial applications. Its 3-pole main contacts and single NO auxiliary contact provide essential control signals without adding extra coil power, while the screw terminals support durable field wiring in demanding environments. The S00 form factor emphasizes a minimal footprint while maintaining Siemens’ typical build quality and compatibility with common 3RT accessories and control schemes.