The Siemens 5SL1250-7MB is a SENTRON miniature circuit breaker — 2-pole, C-curve, rated 50 A, with a 3 kA breaking capacity per IEC 60947-2. It's built for residential and infrastructure branch circuits: lighting, socket outlets, small distribution boards. IP20 with conductors connected means it's enclosed in a panel, not exposed to washdown.
Single-phase operation at 253 V AC and multi-phase at 440 V AC cover split-phase and three-phase distribution. The 50/60 Hz rating is universal for mains frequencies worldwide.
The 36 mm width occupies two modular spaces — standard for a 2-pole MCB. Any mounting position is allowed, so it can be oriented vertically or horizontally in tight enclosures. Sealable for tamper-proof applications. Halogen-free and silicon-free — relevant for clean-room or high-reliability environments where outgassing must be minimized.