Siemens 3RW3046-1AB04 Sirius Soft Starter System

The Siemens SIRIUS 3RW3046-1AB04 soft starter is a size S3 three-phase motor soft starter designed to reduce inrush, control torque, and limit electrical stress during start/stop cycles. It handles up to 100 A and is rated for 55 kW at 400 V, with a wide operating voltage range of 200–460 V AC and a 24 V AC/DC control supply accessible via screw terminals. This unit uses screw-terminal connections for both power and control wiring and is specified for ambient operation up to 40 °C, making it suitable for compact panels and space‑constrained installations. Marketed as part of the SIRIUS 3RW soft-starter family, the 3RW3046-1AB04 provides soft-start and soft-stop functionality to protect motors such as fans, pumps, conveyors, and other 3-phase loads where reduced mechanical stress and smoother acceleration are beneficial. Important product notes indicate this specific model is no longer available and its successor is the 3RW4047-1BB04, with the 3RW30 family offering fewer functions and differing dimensions, so compatibility should be verified if replacing an existing installation.