Motor protection MCCB with UVR — what the ratings mean for fit
The Siemens 3VA2140-5MN32-0CA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) in the motor protection version, carrying a rated continuous current (Iu) of 40 A across the full 40 °C to 50 °C ambient range — no derate needed until you hit 55 °C, where it drops to 38.4 A. That 40 A continuous rating means it's sized for motor full-load currents up to that level, not for feeder or distribution duty where the thermal curve would be set differently. The interrupting capacity tells the real story: 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. Those are high-interrupt ratings — this breaker clears faults without cascading upstream, which matters when you're coordinating a panel with high available fault current. The ETU350M electronic trip unit handles the protection curve, and phase failure detection is built in.
Panel fit and mounting
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. Rated insulation voltage is 800 V. Maximum power loss is 75 W.
Environmental and storage limits
Operating temperature range is -25 °C to +70 °C. Storage range is -40 °C to +80 °C. Latching endurance is 20,000 operations.