Siemens 5SY5425-7CC — SENTRON 4-pole MCB, C-curve, 25 A
The Siemens 5SY5425-7CC is a SENTRON miniature circuit breaker with a 4-pole design and C-curve tripping characteristic, rated 25 A at 35 °C. It carries a DC breaking capacity of 10 kA at 880 V per IEC 60947-2, making it suitable for DC circuits in industrial control panels and machinery. The C-curve (5–10× In) handles moderate inrush loads like motor starters and small transformers without nuisance tripping. Rated for 4-pole DC operation, this MCB mounts on a DIN rail via the quick assembly system in any position. The IP20 protection class (with connected conductors) suits enclosed panel installation. Dimensions are 76 mm depth, 72 mm width, 90 mm height — 4 modular width units.
DC breaking capacity and thermal derating
The 10 kA DC breaking capacity at 880 V (IEC 60947-2) is the headline rating for DC bus or battery-string protection. For AC applications, the UL 1077 / CSA C22.2 No.235 interrupting rating is 5 kA. Ambient temperature derates the continuous current: 25 A at 35 °C, 23.3 A at 40 °C, 22.4 A at 45 °C, 21.45 A at 50 °C, 20.47 A at 55 °C. The surrounding temperature influence curve (max 95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C) governs humidity limits.
Sourcing and availability
This MCB is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time. The part is specified for mechanical engineering and industrial applications per its design designation.