Siemens 5SY4180-6 SENTRON MCB — B-curve, 10 kA, 1-pole
The Siemens 5SY4180-6 is a 1-pole SENTRON miniature circuit breaker (MCB) with a B tripping characteristic, rated to interrupt 10 kA at 400 V AC per IEC/EN 60898-1 and 15 kA at 60 V DC per IEC/EN 60947-2.
The 10 kA breaking capacity at 400 V AC is the figure that governs fault clearance under the EN 60898-1 standard — it means this MCB safely interrupts a short-circuit current up to 10,000 A without welding its contacts or rupturing the case. For DC circuits, the 15 kA rating at 60 V (max 72 V operating) covers battery-backed control buses and solar combiner boxes. The dual-standard listing (IEC 60898-1 for residential/commercial distribution, IEC 60947-2 for industrial switchgear) gives the 5SY4180-6 a wider compliance envelope than a domestic-only MCB; it is accepted in both a lighting sub-panel and a machine control cabinet. The B-curve avoids nuisance tripping on cable charging currents but still clears a hard fault fast enough to protect downstream wiring.
The 18 mm width (1 modular unit) and 70 mm installation depth leave room for adjacent devices in a crowded enclosure. The halogen-free and silicon-free construction matters in environments where outgassing during a fault could corrode nearby contacts or contaminate clean-room air. Ambient operating range spans -40 °C to 75 °C, with humidity derating above 55 °C (95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C).