Siemens 3VA5212-6EC31-0AA0 Molded Case Circuit Breaker

Yes, this 3VA5 series breaker is the direct modern replacement for the discontinued Siemens FD63B125. It serves the same 125A applications but requires the correct 3VA mounting adapter for your specific panelboard.

This breaker can be installed in Siemens P1, P2, and P3 panelboards, as well as standard switchboards. You will need the appropriate 3VA mounting adapter kit, as it does not mount using legacy FD-frame hardware.

The thermal overload protection is permanently set at 125 amps. However, the magnetic instantaneous trip threshold can be adjusted in the field. This allows you to fine-tune the breaker to handle specific inrush currents without nuisance tripping.

Yes, it is rated for DC systems up to 750VDC. It provides a high interrupting capacity of 85kAIC across 250VDC, 500VDC, and 750VDC applications, making it suitable for industrial DC networks.

A feed-thru breaker is designed to be wired directly in line using lugs on both the line and load sides, rather than plugging or bolting directly onto a panelboard busbar. To use this in a Siemens panelboard, a separate mounting adapter is required.

The maximum interrupting rating is 100kAIC at 240VAC. For higher voltage industrial systems, it provides 65kAIC at 480VAC and 25kAIC at 600VAC.

In the Siemens 3VA nomenclature, this section of the catalog number indicates the specific trip unit type and interrupting class. It specifies a thermal-magnetic trip unit with a Class H breaking capacity, which corresponds to the 65kAIC rating at 480V.

No, the Siemens 3VA5 series features non-interchangeable trip units. If your load requirements change from 125 amps, the entire circuit breaker must be replaced.

Yes, Siemens 3VA molded case circuit breakers include a push-to-trip feature on the front face. This allows maintenance personnel to manually test the mechanical tripping mechanism to ensure proper operation.