Siemens 5SY6625-8CC SENTRON MCB — 25 A, D-curve, 4-pole, 6 kA
The Siemens 5SY6625-8CC is a SENTRON miniature circuit breaker rated 25 A with a D tripping characteristic, 4 poles (3P+N), and a 6 kA breaking capacity per EN 60898 at 400 V AC. The 6 kA rating at 400 V AC (per EN 60898) covers most industrial panel fault levels; for UL/CSA jurisdictions it carries a 5 kA interrupting capacity per UL 1077 and CSA C22.2 No. 235. The 4-pole design with switched neutral (3P+N) is built for 3-phase + N applications where you need overcurrent protection on all three phases and the neutral is switched but not protected — common in European-style distribution boards feeding mixed single-phase and three-phase loads. Neutral conductor switching is confirmed, and the supply can be fed from top or bottom (any position).
Environmental and compliance details
Sealable design allows tamper-proof locking after installation. The operating temperature range spans -40 °C to 75 °C, with humidity derating: max 95% RH at 55 °C, tapering to 35% at 75 °C. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. Power loss is 2.1 W per pole in hot operating state at rated current — useful for thermal budget calculations in densely packed enclosures. The combined terminal design (top and bottom) accepts both busbar and cable connections without adapter plates.