Siemens 6SE6440-2UD21-1AA1 Variable Frequency Drive

Siemens 6SE6440-2UD21-1AA1 MICROMASTER 440 without filter is a compact three‑phase variable frequency drive (VFD) designed to control small motors from a 380–480 V supply with precise speed and torque. It delivers a rated output of 1.1 kW with a nominal current around 4.9 A at 400 V and offers a constant‑torque rating alongside overload capacity of 150% for 60 seconds and 200% for 3 seconds, enabling short‑term surge handling. The drive accepts unfiltered 3‑phase input in the 380–480 VAC range and supports 47–63 Hz operation, with a compact enclosure measuring 173 x 73 x 149 mm (H x W x D), IP20 protection, and an ambient operating range from -10 to +50°C, without AOP/BOP options. Typical uses include motor control in automation setups such as machine tools, pumps, and fans where reliable speed regulation and torque response improve process stability and energy efficiency.