Siemens 3VA1025-4ED46-0AA0 — 25 A, 4-Pole MCCB with TM210 Release
The Siemens SENTRON 3VA1025-4ED46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 25 A and a TM210 thermal-magnetic overcurrent release. Its interrupting capacity reaches 121 kA at 240 V AC, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that govern selectivity coordination in a distribution panel. The rated insulation voltage Ui is 800 V, and the maximum rated operational voltage for DC circuits is 600 V. The thermal derating curve is flat from 40 °C to 50 °C at 25 A, then steps down to 24 A at 55 °C and 60 °C, and 23 A at 65 °C and 70 °C. That means in a warm enclosure — say a panel running at 55 °C ambient — you lose 1 A of headroom; at 70 °C you lose 2 A. The front face is rated IP40, so it's protected against tools and wires larger than 1 mm, but not against water ingress; mount it in a suitable enclosure for wet or washdown areas. No communication module is fitted, and there is no ground-fault monitoring or N-conductor protection built in. The power loss at full rated current is 8.5 W maximum — negligible for panel thermal budgeting, but worth noting if you're packing multiple breakers in a small sub-distribution board. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Panel Fit and Mounting Dimensions
The breaker measures 70 mm deep, 101.6 mm wide, and 130 mm high. The 101.6 mm width (4 inches) is the standard footprint for a 4-pole SENTRON 3VA frame at this rating — it occupies the same DIN-rail or mounting-plate space as other 4-pole 3VA breakers in the same frame size. If you're replacing a 3VA1020-3ED36-0AA0 or similar, the physical envelope is identical; no panel re-drilling or bus-bar rework is required.
Selectivity and Coordination Notes
With 121 kA at 240 V and 75.6 kA at 415 V, this breaker is sized for high-fault-current installations — typically a main or feeder position in an industrial distribution board where the available fault current exceeds what a standard MCB can handle. The TM210 release provides thermal protection for overloads and magnetic (instantaneous) protection for short circuits. For DC applications, the maximum rated operational voltage is 600 V; the manufacturer's device manual covers specific DC switching power values and should be consulted for DC coordination studies.