What this MCCB carries and where it fits
The Siemens SENTRON 3VA1125-5ED42-0AA0 is a 4-pole molded case circuit breaker rated 25 A at 40 °C, with a TM210 thermal-magnetic release tuned for line protection — no undervoltage release, no ground-fault monitoring, no communication module. That 187 kA interrupting rating at 240 V (121 kA at 415 V) means it can clear a high-fault bolted short without upstream coordination headaches; the 70 mm depth and 101.6 mm width keep it in a standard panel footprint.
Interrupting capacity and derating — what the numbers mean for a panel
At 240 V the breaker holds 187 kA SCCR — that is the full rated short-circuit capacity, not a conditional rating. At 415 V it still delivers 121 kA, dropping to 75.6 kA at 440 V and 17 kA at 500 V or 690 V. The TM210 release is fixed thermal-magnetic; no trip indicator, no voltage-trigger accessory. Current derating starts above 55 °C: 24 A at 55 °C, 23 A at 70 °C. Insulation voltage is rated 800 V, so the breaker is comfortable on 480/277 V or 400/230 V systems with headroom.