Its breaking capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — covering most industrial fault-current scenarios without cascading upstream.
That means you can size it into a panel running at 70 °C and still count on the full 40 A without oversizing the frame. The 187 kA interrupting rating at 240 V is the headline figure for US 240 V delta or 277/480 V wye panels where the available fault current is high. The drop to 3 kA at 690 V means this frame is not intended for 690 V main feeders; that rating is for backup or motor-circuit duty where the fault level is low.
The 3-pole footprint matches existing SENTRON 3VA series busbar systems and plug-in adapters. That covers unheated warehouse storage and most outdoor-rated enclosures in temperate climates.