The 5SY6625-6 is a Siemens SENTRON 4-pole miniature circuit breaker — 3P+N, B-curve, rated 25 A at 35 °C and 400 V AC. Breaking capacity sits at 6 kA per EN 60898 and 15 kA per IEC 60947-2 — the higher figure applies when the breaker is installed per the industrial standard, giving you a 15 kA SCCR at 400 V for fault interruption without upstream cascade. Current derates with ambient temperature: 25 A at 35 °C, 24 A at 40 °C, 23.5 A at 45 °C, 22.98 A at 50 °C, 22.45 A at 55 °C. If your panel runs hot, size the load to the derated value at the actual ambient — the 25 A nameplate is only good at 35 °C.
Installation depth is 70 mm; total depth including the front arc is 76 mm. Mounting position is any — vertical, horizontal, upside down in a tight enclosure — no derating needed for orientation. Sealable with a lead seal or adhesive label for tamper-proofing in metering or critical circuits.