Siemens 5SY8525-7 SENTRON MCB — 25 A, C-curve, 2-pole, 30 kA
The Siemens 5SY8525-7 is a current-production SENTRON miniature circuit breaker (MCB) rated 25 A at AC with a C-curve trip characteristic, 2-pole (1P+N) design, and a 30 kA breaking capacity per IEC 60947-2.
At DC, the same standard gives 15 kA, but note the max DC operating voltage is 72 V — this is a DC-rated MCB for control circuits, not for 125 V DC battery banks. The 5 kA rating per UL 1077 and CSA C22.2 No. 235 covers North American supplementary protection applications. Derating matters in a warm panel: at 45 °C ambient it still carries the full 25 A, but at 50 °C it drops to 24.38 A, and at 55 °C to 23.72 A. If your enclosure runs hot, size the upstream load accordingly.
Snap-on DIN-rail mount, any position, 36 mm wide (2 MW). IP20 with connected conductors; touch protection is built in. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz — fine for most rotating machinery. Compliance documentation: the SENTRON series carries IEC 60947-2 (main standard), UL 1077, CSA C22.2 No. 235, and RoHS/REACH declarations are standard from Siemens. The product is classified as function F per IEC 81346-2 and DIN EN 61346-2.