What this MCCB is and what it does
The Siemens SENTRON 3VA2440-5MN32-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuously at 40 °C, designed specifically for motor protection. It carries an undervoltage release and phase failure detection, so it drops the motor offline if a phase is lost or the control voltage dips — a standard requirement for pump and conveyor protection in industrial panels.
Breaking capacity — what it means for your fault level
This breaker interrupts 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. The 187 kA figure at 240 V is high enough for most low-voltage transformer secondaries; the 9 kA at 690 V still covers typical motor-starting faults on 690 V systems. If your panel's available fault current at the line side exceeds these numbers, you need a current-limiting upstream device — but for the vast majority of 400 V industrial distribution, the 121 kA rating gives comfortable headroom.
Panel fit and dimensions
The breaker measures 110 mm deep, 138 mm wide, and 248 mm high. That 138 mm width is a standard 3-pole MCCB footprint for this current class — it fits the usual DIN-rail or backplate mounting pattern without surprises. The 110 mm depth leaves room for rear-connected busbars or cable lugs in a typical 600 mm deep enclosure.
Protection features and auxiliaries
The breaker is designed for motor protection duty, with an integrated undervoltage release (UVR) and phase failure detection. The UVR trips the breaker when the control voltage drops below a set threshold — common in safety circuits that need a loss-of-voltage shutdown. No auxiliary switch is fitted as standard; if you need remote status feedback, you will add an auxiliary switch block separately. The base switch is 3VA2440-5MN32-0AA0.