Siemens 5SY4615-8 — SENTRON 4-Pole D-Curve MCB, 1.6 A
The Siemens 5SY4615-8 is a SENTRON 5SY4-series miniature circuit breaker with four poles configured as 3P+N, a D tripping characteristic, and a 1.6 A rated current at 400 V AC. It breaks fault currents up to 10 kA per EN 60898 and 35 kA per IEC 60947-2, with a DC rating of 15 kA per IEC 60947-2 and 5 kA per UL 1077 / CSA C22.2 No. 235. The D curve means it tolerates high inrush currents — typically used for motor, transformer, or lighting ballast circuits where the start-up surge would trip a B or C curve breaker. Rated for 400 V AC phase-to-phase and 72 V DC maximum, this breaker suits industrial control panels, machinery disconnects, and distribution sub-feeds. The 4-pole format (3P+N) protects all three phases plus the neutral against overcurrent and short-circuit — common in three-phase four-wire systems where the neutral must be switched or protected.
Breaking Capacity & Selectivity
The dual breaking-capacity rating is the key differentiator here: 10 kA under EN 60898 (the domestic / light commercial standard) and 35 kA under IEC 60947-2 (the industrial standard). That 35 kA IEC rating gives headroom for high-fault installations — substation secondaries, large motor control centers, or panelboards with upstream transformers above 500 kVA. The UL 1077 supplementary-protector rating of 5 kA means it's accepted in North American panels as branch-circuit protection for dedicated loads, not as a service disconnect.
Installation & Wiring
Mounts via the quick-assembly system (DIN rail 35 mm) in any position — horizontal, vertical, or upside-down — with an installation depth of 70 mm and overall dimensions 72 mm wide × 90 mm high × 76 mm deep. The 4-pole body occupies 4 width units (72 mm) on the rail. Terminals accept solid or stranded copper from 0.75 mm² up to 35 mm², with combined top and bottom terminals for through-wiring. Touch protection meets IP20 with connected conductors.
Environmental & Compliance
Rated for ambient temperatures from -40 °C to +70 °C, with storage down to -40 °C and up to +75 °C. Humidity tolerance: max 95% RH at 55 °C, derating to 55% at 70 °C and 35% at 75 °C. Halogen-free and silicon-free construction suits clean-room, food-processing, or marine environments where outgassing must be minimized. Lifecycle status is current production — no end-of-life notice on record. Approvals include EN 60898, IEC 60947-2, UL 1077, and CSA C22.2 No. 235, covering installations across Europe, North America, and most global markets. The product designation (F per DIN EN 61346-2 / 81346-2) aligns with standard protection-device labeling in panel schematics.