The Siemens SENTRON 3VA2140-6HN42-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, with no derating across its full ambient range from -25 °C to 70 °C — a flat thermal curve that simplifies panel design in warm enclosures. Its ETU350 electronic trip unit handles line-protection duty with a breaking capacity that starts at 242 kA at 240 V and steps down through 187 kA at 415/440 V, 121 kA at 500 V, to 3.7 kA at 690 V — the high SCCR at the lower voltages means it can serve as a main or branch breaker in high-fault panels without cascading upstream. The 86 mm depth, 140 mm width, and 181 mm height fit the standard SENTRON 3VA footprint, so it mounts into existing panel layouts sized for the series without re-drilling gland plates or re-routing bus bars.
Integration notes
Rated insulation voltage of 800 V gives headroom for 480 V and 600 V class panels. The IP40 front protection means it is suited for enclosed switchgear — not washdown or outdoor exposure without a secondary enclosure. Power loss is 1.6 W maximum, negligible for thermal budgeting inside a multi-breaker panel. No undervoltage release, no ground-fault monitoring, no communication function — this is a straight line-protection breaker with the trip indicator omitted. Storage range of -40 °C to 80 °C covers shipping and warehouse extremes; the operating range of -25 °C to 70 °C matches the flat 40 A rating.