The Siemens SENTRON 3VA1025-4ED32-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for 25 A continuous current, with a TM210 thermal-magnetic overcurrent release and an integrated shunt trip (STL). Its interrupting capacity hits 121 kA at 240 V and 75.6 kA at 415 V — numbers that matter when you're coordinating selectivity downstream of a transformer or a large motor branch.
Breaking capacity and thermal derating
At 240 V this breaker clears 121 kA symmetrical; at 415 V it's 75.6 kA, at 440 V it's 52.5 kA, and at 690 V it's 11.9 kA. That's a steep voltage-dependent drop — if your panel feeds a 690 V motor circuit, the available fault current must stay under 11.9 kA or you need a higher-rated frame. The 25 A rating holds flat from 40 °C to 50 °C, then derates to 24 A at 55 °C and 22.5 A at 70 °C. In a hot enclosure near the top of a panel, that 70 °C figure governs the actual load you can protect.
Physical fit and panel integration
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep. Front protection is IP40 — fine for a dry indoor panel, but not rated for washdown or outdoor exposure. The 3-pole block mounts on a DIN rail or direct panel; no auxiliary contacts are fitted (without auxiliary contact version), and there is no trip indicator on the front. The shunt trip (STL) is the only integrated auxiliary release, so if you need undervoltage release or ground fault monitoring, this variant does not carry them.