The Siemens 5SU1344-7RC63 is a 4-pole RCBO rated at 63 A with a C characteristic and Type A 30 mA residual current protection, packaged in a 7-module width for DIN-rail mounting in final-distribution boards.
Type A residual sensitivity detects pulsating DC fault currents (rectified AC waveforms) in addition to sinusoidal AC, which is the typical requirement for single-phase electronics loads downstream of a rectifier.
At 63 A and 4-pole, this unit covers three-phase + neutral final subcircuits up to that current. The 7-module width fits standard 18 mm per module DIN-rail enclosures; plan for the panel space before the BOM freeze.