It uses the ETU310M electronic overcurrent release, designed specifically for starter protection — meaning it coordinates with motor contactors and overload relays to clear faults quickly while riding through inrush. The interrupting ratings climb to 330 kA at 240 V and hold 242 kA at 415 V and 440 V, dropping to 187 kA at 500 V and 3.7 kA at 690 V.
Thermal performance — flat derating up to 70 °C
That means no derating curve to calculate for typical panel environments; the breaker delivers its full nameplate current even in a hot enclosure near a drive or transformer.
The 105 mm width is the standard 3-pole MCCB pitch for SENTRON 3VA breakers — it fits the same mounting base and busbar system as other 3VA frames, so a panel laid out for a 160 A or 250 A 3VA will accept this 40 A unit without re-drilling. Depth of 86 mm leaves clearance behind the panel door for wiring and accessory modules.