Siemens 3VA4120-4ED34-0AA0 Circuit Breaker

It is compatible with Siemens P1, P2, and P3 panelboards, but it is not universally backward-compatible with older P1 interiors. To install this in a P1 panel, the interior must have been manufactured after October 2020 (designated by an "NGB" suffix) or you must use a specific 3VA41 field-installable strap kit.

The 3VA41 series is the modern upgrade and replacement for several legacy commercial breakers, including the BQD, GB, and older ED-frame series (such as the ED4 and HED4). When upgrading from these legacy models, always confirm you have the correct panelboard strap kit to accommodate the 3VA physical footprint.

Yes. The 3VA41 frame features modular internal pockets next to the trip handle. This allows you to field-install compatible 3VA internal accessories, such as shunt trips, auxiliary switches, undervoltage releases, and alarm switches, without increasing the overall width of the breaker.

Yes. This unit is HACR rated, meaning it is certified for heating, air conditioning, and refrigeration equipment. It is also HID rated, making it approved for switching high-intensity discharge lighting circuits.

Yes, the 3VA4120-4ED34-0AA0 is rated for reverse-feed installations. This allows it to be used safely as a back-fed main breaker or in alternative energy setups where the power flow direction is inverted.

No. Because this is a bolt-on panelboard breaker, the line side fastens directly to the panel bus and does not use wire lugs. Factory-installed mechanical lugs are included on the load side only for your outgoing branch circuit wiring.