SENTRON 3VA2 MCCB with ETU550 Trip Unit
The Siemens 3VA2125-7JP42-0AA0 is a SENTRON 3VA2 series molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous rated current of 25 A across the full ambient temperature range from 40 °C to 70 °C, with no derating required. The 4-pole configuration and electronic ETU550 trip unit make it suitable for applications requiring adjustable protection curves and communication capability.
Breaking Capacity and Selectivity
Breaking capacity is rated at 330 kA at 240 V AC, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. These figures give the panel designer substantial headroom for high-fault-current scenarios typical in industrial main feeders. The 800 V rated insulation voltage supports use in 690 V systems where phase-to-phase clearance is critical.
Communication and Monitoring
This MCCB includes a communication function, enabling integration with higher-level energy management or SCADA systems via the SENTRON portfolio's communication modules. The ETU550 trip unit provides electronic overcurrent protection with adjustable settings, though this variant does not include a ground-fault monitoring version or undervoltage release. The front face carries IP40 protection, suitable for installation in enclosed switchgear.
Physical Dimensions and Installation
Dimensions are 181 mm height, 140 mm width, and 86 mm depth. The 4-pole width of 140 mm fits standard Siemens 3VA2 panel cutouts and busbar arrangements. No trip indicator or voltage trigger is fitted on this variant — the ETU550's electronic status is read via the communication interface.