What this MCCB carries and where it fits
The Siemens 3VA2440-5MN32-0CH0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection — the product designation and design-of-product fields both confirm it is a motor-protection MCCB, not a general-purpose feeder breaker. That means the thermal-magnetic trip curve is shaped to handle motor inrush without nuisance tripping while still clearing a locked-rotor fault. Rated 400 A continuous across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel sizing in hot environments like pump houses or near furnace lines. Short-circuit current ratings step down from 187 kA at 240 V to 121 kA at 415/440 V, 75.6 kA at 500 V, and 9 kA at 690 V. For a 400 A frame that SCCR headroom at 240 V is unusually high — it lets you place this breaker close to a large transformer without worrying about through-fault coordination. Comes with an undervoltage release (UVR) factory-fitted, plus two auxiliary switches and one trip alarm switch (HQ type). That complement covers remote status and undervoltage protection out of the box — no separate purchase for basic signaling.
Dimensions and panel fit
Physical footprint: 248 mm height × 138 mm width × 110 mm depth (9.76 × 5.43 × 4.33 in). Three-pole construction with a trip indicator and phase-failure detection built in — no add-on module needed for phase-loss protection on the motor circuit.
Operating limits and auxiliaries
Ambient operating range -25 °C to 70 °C; storage range -40 °C to 80 °C. Maximum power loss 66 W at full load — factor that into enclosure ventilation if the panel is sealed. The supplied basic switch is order code 3VA2440-5MN32-0AA0; the auxiliary release is the undervoltage release (UVR). No communication module or voltage-trigger option on this variant.