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.
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. 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.
Sealable, halogen-free, and silicon-free — meets the material restrictions for clean-room-adjacent or food-beverage zones where silicone outgassing can contaminate product.