The integrated shunt trip (STL) allows remote tripping for emergency-stop or supervisory control circuits.
Rated 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — these are the maximum fault currents the breaker can safely interrupt at each voltage level. For a 415 V distribution board, the 121 kA figure gives substantial headroom over typical utility fault levels (often 25–50 kA), meaning the breaker stays selective with downstream devices and avoids a blackout on a single branch fault.
Rated 250 A from 40 °C up to 50 °C ambient; above that it derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. Maximum power loss is 37.5 W — that figure matters for enclosure heat calculations, especially in a sealed panel with multiple breakers ganged together.
Auxiliary and alarm contacts
The trip alarm signals a fault condition independently of the aux contacts, which is useful for remote annunciation in an MCC or PLC-driven monitoring system. The base switch itself is order code 3VA2325-5HN32-0AA0; the auxiliary trip module is 3VA9688-0BL32.
Physical fit
Panel cutout and busbar spacing should match the 3VA2 footprint — if you are replacing an older frame, verify the mounting hole pattern against the existing backplate.