SENTRON 5SY4404-5 — 4-pole MCB, Characteristic A
Rated 400 V AC with a breaking capacity of 10 kA per EN 60898-1 and 35 kA per IEC 60947-2 — the higher figure under the industrial standard gives you headroom for high-fault panels where the utility transformer is close. DC side handles 60 V at 15 kA per IEC 60947-2, and UL 1077 listing at 5 kA covers North American panel acceptance. Snap-on mount to DIN rail, 4 MW width (72 mm), any mounting position.
Breaking capacity and selectivity — what the dual rating means
The 10 kA rating under EN 60898-1 is the domestic / light commercial ceiling; the 35 kA under IEC 60947-2 is the industrial rating that matters when you're coordinating downstream of a transformer or a high-capacity upstream breaker. Not for motor starting; that's C or D territory.
That -40 °C floor makes it usable in unheated enclosures or cold-chain facilities.
Sealable cover option available for metering or tamper-proof installs. Quick assembly system for ganging multiple poles or adding auxiliaries. Pollution degree 3, overvoltage category III — rated for fixed installations inside industrial panels, not for outdoor weatherproof use.