Siemens SENTRON 3VA2125-8JQ46-0AA0 — 25 A 4-Pole MCCB with Ground-Fault Monitoring
The Siemens 3VA2125-8JQ46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current across a 4-pole configuration, designed for line protection in distribution panels. Its 800 V rated insulation voltage and breaking capacity of 440 kA at 240 V — derating to 330 kA at 415 V and 52.5 kA at 690 V — give it the headroom for high-fault industrial services where selectivity and SCCR coordination matter. The unit includes a communication function for integration into monitored power systems and a summation-current ground-fault monitoring scheme that reads L + N conductor imbalance. This makes it suitable for feeder circuits where ground-fault detection is required without a separate relay. The 25 A rating holds flat across the full ambient range from 40 °C to 70 °C — no derating needed in a warm enclosure. The operating temperature floor is -25 °C, storage range -40 °C to 80 °C.
Mounting and Integration
Dimensions are 140 mm wide by 181 mm tall by 86 mm deep — a standard MCCB footprint for 4-pole SENTRON units. Panel cutout and busbar spacing match the SENTRON 3VA family; verify the existing mounting plate accommodates the 140 mm width before ordering.