Siemens 3RW4026-1BB15 Soft Starter 15 kW 25 A

Siemens SIRIUS soft starter 3RW4026-1BB15 provides reduced-voltage starting for three-phase motors, rated for 15 kW at 500 V with a continuous current rating of 25 A, and supports 400–600 V AC mains with a control coil rated for 110–230 V AC/DC. This S0‑class device includes an integrated bypass contact system, allowing main current to bypass the thyristor stack after ramp-up, and it offers intrinsic device protection, motor overload protection, external reset, and an adjustable current limit. It uses screw terminals and is rated for insulation up to 600 V, with a 50–60 Hz operating range and a minimum load of 20% of Ie. The unit weighs about 0.696 kg and measures roughly 156 × 182 × 58 mm in an IP20 enclosure, suitable for indoor installation. Designed for standard applications for soft starting and running of three-phase induction motors, it is commonly used to control conveyors, fans, or pumps by limiting inrush current and controlling ramp times to protect mechanical systems.