The Siemens 3VA2140-6HL42-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) for line protection, carrying 40 A continuous through four poles with an ETU320 electronic trip unit. The interrupting ratings are the headline: 242 kA at 240 V AC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V — so it handles high available fault current on the low-voltage side of a distribution transformer without cascading upstream. The 40 A rating holds flat across the full ambient range from 40 °C to 70 °C, which means no derating in a warm enclosure.
The breaker measures 181 mm high by 140 mm wide by 86 mm deep, which is the standard 3VA2 four-pole footprint.
Rated insulation voltage is 800 V, and the power loss at rated current is 1.6 W maximum — negligible for panel thermal budgeting. The operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.