Line protection MCCB — 40 A, 2-pole, high interrupting capacity
The Siemens 3VA1140-4ED26-0AA0 is a 2-pole SENTRON molded case circuit breaker rated 40 A continuous at 40 °C, with a TM210 thermal-magnetic overcurrent release. It delivers 121 kA interrupting capacity at 240 V AC and 75.6 kA at 415 V AC — figures that cover most industrial service-entrance and feeder applications without needing an upstream current-limiting fuse. The compact 50.8 mm wide footprint fits standard panel layouts, and the IP40 front protection suits enclosed distribution boards.
Thermal derating and operating range
Current rating holds flat at 40 A from 40 °C through 50 °C, then steps down to 39 A at 55–60 °C, 38 A at 65 °C, and 37 A at 70 °C (–). The operating temperature range spans -25 °C to +70 °C, with storage from -40 °C to +80 °C. Maximum power loss is 7.2 W.