Siemens 3VA2140-0KP42-0AA0 SENTRON MCCB, 40 A, 4-Pole, ETU85

The Siemens SENTRON 3VA2140-0KP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) carrying a 40 A continuous current rating and an ETU850 electronic trip unit. The ETU850 is a microprocessor-based release that gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — meaning you can coordinate this breaker downstream of a larger feeder without nuisance tripping, and set the N-conductor protection anywhere from OFF to 40%–160% of the phase rating. The headline breaking capacity is 440 kA at 415 V AC and 187 kA at 690 V AC. At 690 V the 187 kA rating still covers most industrial distribution bus faults. The adjustable trip range spans 60 A minimum to 480 A maximum, so while the breaker is rated for 40 A continuous (the frame size), the electronic trip can be dialed up to protect a circuit drawing up to 480 A — typical for a feeder feeding multiple downstream sub-panels or a large motor control center. The 40 A continuous rating holds flat across the full ambient temperature range from -25 °C to 70 °C, with no derating needed. Panel footprint: 181 mm high, 140 mm wide, 86 mm deep. IP40 front protection is standard for switchboard mounting.