What this MCCB delivers and where it fits
The SENTRON 3VA1140-5ED42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated 40 A continuous at 40 °C, built for line protection in distribution panels. Its TM210 thermal-magnetic release handles overload and short-circuit trip curves without external controls. With a 187 kA interrupting rating at 240 V AC — dropping to 121 kA at 415 V and 75.6 kA at 440 V — this breaker provides serious fault-current headroom for high-capacity feeders where selectivity with downstream devices matters. Rated insulation voltage is 800 V, and the breaker carries a maximum power loss of 10.8 W at rated load. The front face is IP40-protected, so it's suited for panel-mount applications where the enclosure provides the environmental seal.
Current derating and thermal limits
At ambient temperatures up to 50 °C the breaker holds a full 40 A rating. From 55 °C it derates to 39 A, and at 70 °C it drops to 37 A. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If your panel runs hot — near a transformer or in a sun-loaded enclosure — the 3VA1140-5ED42-0AA0 still delivers most of its rated current without needing a larger frame.
Interrupting capacity across voltage levels
The interrupting ratings span from 187 kA at 240 V down to 17 kA at 500 V and 690 V. That steep drop-off means at higher voltages the breaker's available fault-current handling is much lower — coordination studies should use the 500 V / 690 V figure where applicable. At 415 V (common in European industrial systems) the 121 kA rating still exceeds most transformer-fed fault levels.