What the ratings mean for fit
The 3VA2025-7KQ36-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — that is, it sits at the feeder or branch to protect cables and buswork, not a specific motor. Its 25 A continuous rating holds flat across the full ambient range from 40 °C to 70 °C (–), which means no derating in a hot panel. The adjustable thermal overload band of 38 A minimum to 300 A maximum covers a wide range of downstream loads, but the breaker frame itself is sized for the 25 A continuous path — the 300 A top end is the magnetic trip setting, not the continuous ampacity. The interrupting ratings are the real headline: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3 kA at 690 V. That 330 kA at 240 V is a high-fault rating — it tells you this breaker can safely clear a bolted fault on a large transformer secondary without welding its contacts or rupturing the case. At 690 V the rating drops sharply to 3 kA, so if your system runs at 690 V, verify the available fault current stays under that limit. Rated insulation voltage is 800 V, and the breaker includes a communication function plus ground-fault monitoring via summation current formation on the L-conductor. That ground-fault feature is useful for detecting leakage on ungrounded or high-resistance-grounded systems without an external GF relay.
Panel integration
The 3VA2025-7KQ36-0AA0 measures 86 mm deep, 105 mm wide, and 181 mm high (–). It mounts on a DIN rail or panel-mount via the standard SENTRON footprint. The 3-pole design means it occupies three module widths — plan for a 105 mm slot in your enclosure layout.