The 121 kA interrupting rating at 240 VAC gives it headroom on high-fault utility feeds or transformer secondaries; at 415 VAC it still clears 75.6 kA, and at 690 VAC it holds 11.9 kA. That SCCR range makes it suitable for panel main or feeder duty where fault current is substantial. The housing is sized at 130 mm high × 76.2 mm wide × 70 mm deep — a standard SENTRON 3VA fixed-mount footprint that fits the same panel cutout as other 3VA1140 frame sizes.
Auxiliary switching and monitoring
The auxiliary contacts follow the breaker position (ON/OFF); the trip alarm switch closes only on a fault trip, which gives a separate signal for remote annunciation without needing an external relay. The trip indicator flag on the front confirms whether the breaker opened on overload/short or was manually switched off.
At 55 °C it drops to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A.