What this RCBO carries
The Siemens 5SU1444-8RC32 is a 4-pole RCBO rated 32 A with D characteristic overcurrent protection and Type A residual current detection at 100 mA. It occupies 7 module widths on a DIN rail, standard for a 4-pole unit in the 5SU4 line. The Type A residual detects pulsating DC fault currents, which standard AC-only RCDs miss; common on variable-speed drives and electronic loads. At 32 A and 4-pole, this unit handles three-phase plus neutral in a single enclosure — typical for a sub-distribution board feeding a small machine or a lighting circuit in an industrial panel.
Snap-on DIN rail mount, 7 module spaces at 18 mm each — 126 mm total width. Standard for a 4-pole RCBO in a Siemens 5SU4 or 5SM6 enclosure system. Busbar-compatible with the Siemens 5ST3 series for feed-through or splitter configurations.