The Siemens SENTRON 5SN6150-7CP is a 1-pole miniature circuit breaker (MCB) from the 5SN series, designed for DIN-rail mounting in distribution boards and control panels. Its 18 mm width occupies one modular unit, and the 76 mm depth fits standard enclosure depths with 70 mm installation depth clearance. Rated 400 V AC for multi-phase or single-phase operation, with a maximum of 440 V AC. On the DC side it handles up to 72 V. The breaking capacity is 6 kA per EN 60898 and 10 kA per IEC 60947-2 — the higher IEC figure matters when the breaker sits in an industrial panel with higher available fault current, not just a residential load center. Accepting solid conductors up to 35 mm², the terminals handle the larger wire sizes common in feeder circuits. Typical mechanical service life is 10,000 operating cycles, and the power loss per pole runs 3.8 W at rated current in hot condition — a number to check if the breaker is ganged with others in a sealed enclosure where heat buildup matters.
The 18 mm width (one modular unit) means it occupies a single slot in a distribution board.