What this SENTRON 3VA1 MCCB is and what it protects
The Siemens 3VA1025-3ED32-0HA0 is a SENTRON 3VA1 molded case circuit breaker (MCCB) designed for line protection — the primary feeder or downstream branch in a distribution panel. It carries a 25 A continuous rating at 40 °C, holds that rating steady through 50 °C, then derates by 1 A per 5 °C step up to 23 A at 70 °C. That thermal curve means you size the breaker for the load at the panel ambient, not the nameplate ampacity. Three poles, rated insulation voltage 800 V. The interrupting ratings climb with system voltage: 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 480 V panel, the 32 kA at 440 V is the closest published figure — expect similar headroom at 480 V, but verify the coordination study against the available fault current. The overcurrent release is a TM210 — thermal-magnetic, fixed thermal, fixed magnetic. No trip indicator, no communication function, no ground-fault monitoring. This is a straightforward thermal-magnetic breaker for basic feeder or branch protection where you don't need adjustable pickup or remote status.
Shunt trip and auxiliary release
This variant includes a shunt trip (STL) release — designated as the auxiliary release type. That means you can remotely trip the breaker by energizing the shunt coil, which is useful for emergency-stop circuits or interlocking with a fire-alarm system. The undervoltage release is not fitted on this order code. If you need undervoltage protection, you'd spec a different 3VA1 suffix.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width (3 in), 70 mm depth (2.76 in). Standard 3-pole MCCB footprint for a 25 A frame. Mounts on a DIN rail or direct panel-mount via the lugs. The 70 mm depth is shallow enough for most 200 mm deep enclosures without crowding the gland plate. Power loss is 8.5 W maximum — negligible for thermal rise in a typical panel, but worth noting if you're packing multiple breakers in a sealed box.