Siemens 5SL4125-6CC — SENTRON 1-pole MCB, B-curve, 25 A
Rated for 230/400 V AC single-phase and multi-phase operation respectively, with a maximum multi-phase voltage of 440 V AC. Energy limiting class 3 keeps let-through energy low, reducing stress on downstream wiring and equipment during a fault.
The 18 mm width (1 width unit) matches the standard modular grid; no special end-plate or spacer needed for adjacent breakers. Terminals accept 0.75 mm² to 25 mm² solid or stranded copper — covers the full range from 1.5 mm² lighting circuits up to 6 mm² feeder tails. IP20 protection with connected conductors; suitable for dry indoor enclosures only. Sealable with a lead seal or adhesive label to prevent unauthorized reset after commissioning.
Rated for ambient temperatures up to +55 °C with 95% humidity, and vibration resistance of 50 m/s² at 25 to 150 Hz per IEC 60068-2-6. Overvoltage category 3, pollution degree 2 typical for fixed-installation distribution boards.