The Siemens SENTRON 3VA2140-8HN46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, using an ETU350 electronic trip unit for line protection. It carries a 440 kA interrupting capacity at 240 V AC, dropping to 330 kA at 415 V and 220 kA at 500 V, with a symmetrical rating of 480 A. The insulation voltage is rated at 800 V.
Interrupting capacity and selectivity
That 440 kA at 240 V is the headline number, but what matters for panel coordination is the curve at your system voltage. At 415 V it still holds 330 kA — enough to sit upstream of most downstream breakers in a 400 V distribution board without cascading. At 690 V it drops to 52.5 kA, so if you're on a 690 V mining or marine supply, verify the fault level at the point of common coupling. The 480 A symmetrical rating tells you the breaker can handle a 480 A rms symmetrical fault current without damage — that's the mechanical withstand, not the interrupting rating.
Thermal performance and panel fit
The continuous rating holds at 40 A across the full operating temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. That's unusual for a molded case; most breakers start tapering above 40 °C. The IP40 front protection means it's fine for a clean indoor panel but not for washdown environments. Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a standard 4-pole MCCB footprint that drops into a SENTRON panelboard or DIN-rail adapter without reworking the busbar layout.