Siemens RCJ44R Three Phase AC Electromagnetic Contactor

Siemens RCJ44R Three Phase AC Electromagnetic Contactor is a compact, 3-pole device designed to switch three-phase motors and similar loads in industrial control panels. In Siemens’ catalog, variants with a 24 V DC control coil are rated for AC-3e/AC-3 duty, and for example the model 3RT2018-1BB44-3MA0 specifies a main current rating of 16 A and a motor rating of 7.5 kW at 400 V. The unit includes two normally open and two normally closed auxiliary contacts, uses screw terminals for the main and auxiliary circuits, and is offered in frame size S00 with a captive auxiliary switch for straightforward wiring. Typical applications include starting and stopping three-phase motors in pumps, fans, conveyors, and other industrial equipment where reliable motor control and integrated auxiliary contacts support safe interlocks, sequencing, and control circuit feedback. The compact S00 frame and screw-terminal design enable space-efficient installation in control panels and align with common Siemens control architectures.