Siemens 3VA5112-4ED31-0AA0 Molded Case Circuit Breaker

While it fits natively into 3VA series panelboards, installing this breaker into legacy Siemens P1 or P2 panels requires a specific field-installable adapter mounting kit. You cannot mount this 3VA51 frame directly to the P1 or P2 bus without the proper conversion kit.

Yes. The 3VA5112-4ED31-0AA0 serves as a modernized, direct replacement for older 125-amp ED-frame breakers, such as the ED43B125. When upgrading legacy switchgear or P1/P2 panels, verify you have the correct 3VA retrofit mounting adapter.

The LI designation indicates a thermal-magnetic trip unit providing two distinct types of protection: Long-Time (L) for overload conditions and Instantaneous (I) for short circuits. Both the thermal and magnetic trip thresholds on this specific model are fixed.

Yes. In addition to its standard AC ratings, this breaker is rated for DC applications up to 500VDC, delivering an interrupting capacity of 50kA. This makes it highly versatile for mixed AC and DC industrial switchgear applications.

Yes. The Siemens 3VA51 frame is modular and features internal accessory pockets. It can be field-fitted with various auxiliary switches, shunt trips, or undervoltage releases directly under the front cover without increasing the overall footprint of the breaker.

The interrupting rating (AIC) indicates the maximum fault current the breaker can safely clear. Installing a replacement breaker with an AIC rating lower than the available fault current in your panel poses a severe explosion and fire hazard. The 3VA5112-4ED31-0AA0 must only be used in 480V systems where the maximum available short-circuit current is 25kA or less.

No. This specific breaker features fixed thermal and fixed magnetic trip settings. The overload and short-circuit thresholds are permanently calibrated at the factory for 125 amps and cannot be modified or dialed up or down in the field.

This breaker is rated for 600Y/347VAC systems with an interrupting capacity of 14kA, meaning it is suitable for 600V solidly grounded wye systems. It is not intended for 600V ungrounded delta configurations.