The Siemens SENTRON 3VA2340-7JQ42-0AA0 is a 4-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with the ETU560 electronic trip unit providing adjustable long-time, short-time, instantaneous, and ground-fault protection. At 690 V the breaking capacity drops to 7.5 kA, which still covers most motor-circuit fault levels at that voltage.
Above 50 °C the curve steps down: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, 300 A at 70 °C. The 248 mm height, 184 mm width, and 110 mm depth fit standard MCCB mounting footprints; the IP40 front protection means the breaker face is protected against solid objects over 1 mm but not against dust ingress — mount inside a sealed enclosure for dusty environments.
Trip unit and communication capability
The ETU560 electronic trip unit supports adjustable long-time pickup (Ir), short-time pickup (Isd) with I²t on/off, instantaneous pickup (Ii), and ground-fault pickup (Ig) with adjustable time delay. The N-conductor protection is adjustable OFF or 20% to 100% of the phase rating — critical for 4-wire systems where the neutral must be protected. Communication function is built in (yes), enabling integration with energy management systems via SENTRON accessories like the COM module.