Its job is to clear faults fast and keep the rest of the bus alive. Breaking capacity is the headline number for an MCCB — and this one delivers 52.5 kA at 240 V AC, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500/690 V.
Above that, it derates: 24 A at 55–60 °C, 23 A at 65–70 °C. The 8.5 W maximum power loss also contributes to the internal heat rise. Dimensions are 76.2 mm wide (3 in), 130 mm tall (5.12 in), 70 mm deep (2.76 in). It fits existing SENTRON 3VA mounting bases and busbar systems.
The closest sibling is the 3VA1020-3ED36-0AA0. Both are 3-pole SENTRON MCCBs with the same TM210 release and the same physical footprint. The difference is the continuous current rating: this 3VA1025 is a 25 A frame; the 3VA1020 is a 20 A frame. Everything else — breaking capacity, dimensions, accessories — is identical. If your BOM calls for 20 A and you have 25 A in hand, it will physically install and the higher rating won't cause a problem as long as the downstream conductors and load are sized for 25 A. Going the other way (substituting a 20 A into a 25 A circuit) is a code violation unless you also downsize the OCPD coordination.