Siemens 6SE6440-2UC21-5BA1 Soft Starter Module

The Siemens MICROMASTER 440 6SE6440-2UC21-5BA1 is a compact soft-start drive module that enables controlled starting of small motors with reduced inrush, part of Siemens' MICROMASTER 440 family. This variant is rated for 200–240 V AC input at 47–63 Hz, delivering up to 1.5 kW of output (1/3 AC configuration) and is specified as without an integrated line filter. Its enclosure measures 202 × 149 × 172 mm (HxWxD) and carries IP20 protection, with an operating ambient temperature range of -10 to +50 °C. The unit supports overload conditions of 150% for 60 seconds and 200% for 3 seconds, consistent with its 1.5 kW rating and square-law torque characteristics. Identified by MLFB 6SE6440-2UC21-5BA1, this model lists a successor as SIOS ID 109746454.