Description

The ABB PSR45 is an electronic soft starter rated at 45 A for three-phase induction motors up to 22 kW at 400 V, providing controlled acceleration to reduce starting current and mechanical stress on the motor and driven load. As part of ABB’s PSR series, the PSR45 is suitable for the 22 kW motor size commonly used in larger pump drives, fan installations, compressor starters, and industrial process machinery. The thyristor voltage control circuit ramps the motor voltage from an adjustable initial level to full supply voltage over a set time, producing a smooth and controlled start that reduces peak demand on the supply network.

The PSR45 complies with IEC 60947-4-2 and is designed for 35 mm DIN rail mounting in industrial motor control panels. The two-parameter front-panel adjustment system (initial voltage and ramp time) enables simple field commissioning without specialist software. The device is designed for use with a bypass contactor, which is connected in parallel to short out the thyristor stage after motor run-up, eliminating losses and protecting the soft starter during continuous motor operation. ABB provides co-ordination data for selecting appropriate bypass contactors and protection devices.

The PSR45 is applied to larger pump installations, significant fan drives in building services and industrial HVAC systems, compressors, conveyor drives, and process machinery drives in manufacturing, water treatment, and energy applications. Its robust design and straightforward operation make it a practical and reliable choice for panel builders and electrical engineers requiring a proven soft start solution for 22 kW motor applications. The PSR45 is supported by ABB’s comprehensive motor control accessories and co-ordinated protection products for complete motor starter system design.