SENTRON 3VA1 MCCB — 40 A, 3-Pole, High Interrupting Capacity
It carries a 220 kA breaking capacity at 240 V AC, stepping down to 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V — meaning it can clear high-fault currents upstream of a distribution panel without cascading to the main breaker, provided the SCCR coordination study supports it. The supplied basic switch carries order code 3VA11406EF320AA0.
Thermal Derating and Ambient Constraints
Rated current holds at 40 A from 40 °C through 50 °C ambient, then derates to 39 A at 55 °C and 60 °C, 38 A at 65 °C, and 37 A at 70 °C. Maximum power loss is 10.8 W.
Width 76.2 mm (3 in), height 130 mm (5.12 in), depth 70 mm (2.76 in). Three-pole footprint matches the standard SENTRON 3VA1 cutout; verify the existing DIN-rail or screw-mount backplate accommodates the 70 mm depth behind the panel door — shallower enclosures may need a spacer.