Siemens 6SE6440-2UD21-1AA1 Soft Starter Module

Siemens Micromaster 440 drive is a compact three-phase variable-speed drive designed to control a motor from a 380–480 V AC supply without an input filter. This 'without filter' variant matches installations that do not require an external line EMI filter. The unit is rated at 1.1 kW and accepts a 3-phase input of 380–480 VAC with a tolerance of +10% / -10% and a supply frequency range of 47–63 Hz. By modulating output voltage and frequency to the connected motor, the Micromaster 440 provides precise speed control and smooth acceleration and deceleration, helping to match motor performance to changing process requirements. The 6SE6440‑series designation identifies this specific configuration within Siemens’ Micromaster 440 family, a line of compact drives commonly used in automation and equipment retrofit projects where reliable 1.1 kW motor control at 380–480 VAC is needed. As a Siemens product, it integrates with broader control systems and can be swapped in for similar MM440 configurations in compatible installations. When selecting a drive for a 1.1 kW, 3-phase motor, the 6SE6440-2UD21-1AA1 offers a compact, proven solution from a global automation leader, designed to enable scalable speed control within standard industrial power networks.