The Siemens 5SL4414-7 is a 4-pole SENTRON miniature circuit breaker (MCB) with a C-curve tripping characteristic, rated at 0.3 A at 400 V AC. It delivers a 10 kA breaking capacity per both EN 60898 and IEC 60947-2, which means it can safely interrupt fault currents up to that level without upstream damage — critical for coordination in a residential or infrastructure distribution board.
Ratings and what they mean for the panel
The 0.3 A rating is temperature-sensitive: at 30 °C it holds 0.3 A, but at 55 °C it derates to 0.26 A. If this breaker lands in a warm enclosure — say, above a transformer or in a sunny meter cabinet — the effective continuous current drops. The C-curve means it trips at 5 to 10 times rated current, so it handles motor inrush or capacitive loads without nuisance tripping, but still clears a hard short fast. On the DC side, the maximum rated voltage is 72 V. That limits its use in DC sub-distribution unless the string voltage stays under that. For multi-phase AC operation, the maximum voltage is 440 V, so it fits standard 400 V three-phase networks with headroom. Mechanical service life is 10 000 operating cycles typical — fine for a distribution board that sees infrequent switching, but not for a daily-use disconnect under load.
Mounting and integration
Occupies 4 modular width units (72 mm wide) on a standard DIN rail. Installation depth is 70 mm, overall depth 76 mm. Mounting position is any, so it fits vertical or horizontal busbars without derating. IP20 with connected conductors — suitable for enclosed distribution boards, not for wet or washdown areas. Sealable, halogen-free, and silicon-free — meets the material restrictions for clean-room-adjacent or food-beverage zones where silicone outgassing can contaminate product. Touch protection is built in, and overvoltage category III with pollution degree 2 means it's rated for fixed installation downstream of the main panel.