63 A RCBO with D-curve and AC-type residual current — what it means on the panel
The Siemens 5SU1444-2RC63 is a 4-pole RCBO (residual current breaker with overcurrent protection) from the SENTRON family, rated 63 A at 415 V AC, 50 Hz. It combines a D-curve MCB with an AC-type 100 mA residual current device in one 7-module-wide unit.
Mounting and integration — 7 MW footprint, any orientation
Occupies 7 modular width units (126 mm) on a DIN rail; depth is 70 mm. Mounting position is unrestricted — install upright, sideways, or inverted inside the distribution board. Supply can enter from top or bottom. The IP20 rating applies with the distribution board closed and conductors connected — standard for enclosed panel installation, not for exposed mounting. The 70 mm installation depth matches standard SENTRON RCBO dimensions; check your enclosure's door clearance if using a shallow box. Four poles protected (all poles switched and monitored for residual current). The 4-pole design covers three-phase-plus-neutral circuits; for single-phase or three-phase without neutral, a 1P+N or 3P variant would be the correct choice.