Interrupting capacity is the headline: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V. That is enough headroom for most secondary distribution panels fed from a transformer in the 500–1000 kVA range. Below 415 V the interrupting rating climbs, so the same breaker covers 240 V split-phase or 208Y/120 V panels with substantial margin.
At 55 °C it derates to 19.2 A, at 60 °C to 18.8 A, at 65 °C to 18.4 A, and at 70 °C to 18 A. For a panel that runs warm — say a packed enclosure with multiple breakers in a row — the 50 °C flat rating is generous; the derating curve is linear above that, so a 60 °C internal ambient still leaves 18.8 A continuous, which is 94% of nameplate.
Auxiliary and shunt trip configuration
This variant ships with two HQ auxiliary switches and a shunt trip (STL) release. The HQ contacts are high-rupturing-capacity auxiliary switches rated for signal feedback — they indicate breaker position (open/closed/tripped) to a PLC or status lamp. The shunt trip allows remote tripping by applying a control voltage; it is wired separately from the main power circuit, so a safety relay or emergency-stop chain can open the breaker without requiring a manual visit to the panel. The integrated auxiliary trip order code is 3VA9688-0BL33, which is the factory-fitted internal accessory for this specific build.