Siemens 3RW4028-1TB04

Soft starter SIRIUS 3RW40

Soft starters 250 kW are suitable for standard 3-phase applications and are designed for soft on/off of three-phase induction engines. It's avoid current peaks and torque that happen when utilization "star-delta" starters. Soft starters are appointed with optimum serviceability. The built-in bypass contact system diminishing the power losses within exploitation, whereby the components do not overheat. With the 4-step rotary switch, the overload trip time can be set. Thanks to the managed current limitation, the engine is surely protected yet from an unexpected growth in current strength. Three LEDs are utilized to display the operating mode, ineffective trip times (trip class), phase failure, overheating. The main typical applications: construction machines, air conditioning systems, conveyors, chillers, centrifuges, mixers.