The Siemens 5SU1324-8RC63 is a 2-pole RCBO rated 63 A with D characteristic and Type A 30 mA residual-current protection, packaged in a 4-module DIN-rail housing.
The 4-module width snaps onto a DIN rail in a standard distribution board or sub-distribution panel. D characteristic suits high-inrush loads such as motor starters or transformers, while Type A 30 mA residual-current detection covers pulsating DC fault currents from single-phase rectifiers or electronic loads.