Siemens 3RT2027-1BW40 Overload Relay

Siemens 3RT2027-1BW40 is a three‑pole power contactor from the Sirius 3RT2 family designed for AC‑3 motor switching. It provides a 32 A main current rating and can switch motors up to 15 kW at 400 V, with a 48 V DC coil for control. The unit includes one normally open and one normally closed auxiliary contact for interlocking and signaling, and it uses screw terminals in size S0. It is rated to switch up to 690 V AC, making it suitable for use in industrial control panels and machine wiring where compact, reliable motor control is required. Typical applications include starting and stopping three‑phase motors in manufacturing lines, conveyors, and processing equipment, especially when a compact, 3‑pole control device with built‑in signaling is advantageous. As part of Siemens’ motor‑starter ecosystem, it can be combined with standard protection and interlock accessories to form complete motor‑control circuits.