Siemens 3VA2140-5MN32-0AE0 — 40 A SENTRON MCCB with ETU350M
It carries a breaking capacity of 187 kA at 240 V AC and 121 kA at 415 V and 440 V AC — figures that place it in the high-interrupting class, sized for fault currents typical at the main distribution board or large motor branch circuit. The breaker ships with four HQ auxiliary switches and no undervoltage or shunt release fitted, so those functions must be added externally if required.
Rated insulation voltage is 800 V, and the interrupting ratings step down across the voltage range: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. The 40 A continuous rating holds from 40 °C through 50 °C ambient; above that it derates to 38.4 A at 55 °C and 36 A at 70 °C (–). Mounted in a panel that runs warm — near other breakers or a transformer — factor that derate into the load calculation. Maximum power loss is 75 W. No trip indicator is fitted, so a blown breaker requires a multimeter or auxiliary contact feedback to confirm state.