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
Power loss is 1.6 W maximum, negligible for thermal budgeting inside a multi-breaker panel. 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.