SENTRON 3VA2125-7MQ32-0AA0 — 25 A MCCB with Motor Protection and High Interrupting Capacity
The Siemens 3VA2125-7MQ32-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection, rated for 25 A continuous current across the full ambient range from 40 °C to 70 °C with no derating needed. Its interrupting capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V — giving the panel designer headroom for high-fault installations upstream of motor starters. The 3-pole design includes phase failure detection, a communication function, and an additional measurement function, making it suitable for integration into monitored motor control centers.
Motor Protection and Adjustable Trip Settings
This MCCB is configured for motor protection duty, with an adjustable thermal-magnetic trip that can be set from a minimum of 3 s to a maximum of 30 s at the overload threshold, and an initial value of 5 A. The full-scale value is 25 A, matching the continuous current rating, and the breaker does not include an undervoltage release or voltage trigger, so it relies on the trip unit alone for fault clearing. Ground-fault monitoring is available via summation current formation on the L-conductor, adding a layer of protection for personnel and equipment in grounded systems.
Panel Integration and Environmental Limits
The 3VA2125-7MQ32-0AA0 occupies a 105 mm width on the DIN rail, with a depth of 86 mm and height of 181 mm — a compact footprint for a 3-pole MCCB with this interrupting capacity. It operates from -25 °C to 70 °C ambient and can be stored from -40 °C to 80 °C, with maximum power dissipation of 0.6 W. The trip indicator is not present, so visual status confirmation requires a separate auxiliary contact or communication module.