What this MCCB delivers
The Siemens SENTRON 3VA2140-5MN32-0CC0 is a 3-pole molded case circuit breaker rated at 40 A continuous current (at 40 °C ambient) with a breaking capacity of 187 kA at 240 V AC. This is a motor-protection version with an integrated undervoltage release and two HQ auxiliary switches. The undervoltage release drops the breaker if control power falls below a threshold — useful for coordinated shutdown sequences on a line.
Panel fit and derating
At 55 °C it derates to 38.4 A, and at 70 °C to 36 A. Maximum power loss is 75 W — that's the heat the breaker dissipates at full load; account for it in enclosure thermal calculations.
Breaking capacity across voltages
Breaking capacity varies with system voltage: 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.