What this 1-pole MCB brings to the panel
The Siemens 5SN6132-7CP is a 1-pole miniature circuit breaker from the SENTRON 5SN family, rated for 400 V AC at 50 Hz. Single modular width unit (18 mm) means it snaps into a standard DIN-rail enclosure and occupies one slot, no different from any other 1-pole MCB in the same footprint.
Fit and environmental range
Depth of 76 mm (installation depth 70 mm) and height of 90 mm match the SENTRON 5SL and 5SY series, so swapping between them on a DIN rail takes no panel rework. Conductor cross-section up to 35 mm² solid accepts the feeder tails common in sub-distribution boards.
The dual breaking-capacity rating is the spec that decides selectivity. The 72 V DC maximum rating means it also handles control-circuit protection in DC auxiliary supplies, though the primary duty is AC branch protection.