The Siemens SENTRON 3VA2140-0MS36-0AA0 is a 3-pole molded case circuit breaker (MCCB) designed for motor protection, carrying a continuous current rating of 40 A across the full ambient range from 40 °C through 70 °C — no derating needed up to that ceiling. The rated insulation voltage is 800 V, and the breaker delivers a breaking capacity of 440 kA at 415 V AC and 187 kA at 690 V AC, so it can handle high-fault-current scenarios common in industrial distribution.
The ETU310M trip unit is electronic — more precise than a thermal-magnetic for motor protection, with adjustable pickup and time delays. Power loss is only 1.2 W maximum, negligible for panel thermal budgeting.
