Square D EDB24125 Miniature Circuit Breaker

This E-Frame breaker is designed exclusively for use in Square D NF series panelboards. It cannot be installed in NQ, NQOD, QO, or I-Line panelboards, which require completely different breaker frame types.

Yes. EDB series circuit breakers do not have specific line and load terminal designations, meaning they can safely be backfed and utilized as a main breaker in an NF panelboard. Because it is a bolt-on breaker, the bolted connection to the panel bus inherently satisfies the NEC requirement for physically securing a backfed main device.

The EDB, EGB, and EJB breakers share the exact same physical footprint, bolt-on mounting configuration, and thermal magnetic trip mechanisms. The difference is strictly their short circuit interrupting ratings at 480Y/277VAC. The EDB24125 provides standard protection at 18kA, while the EGB and EJB step up to 35kA and 65kA respectively.

Yes. The EDB24125 is UL Listed as HACR type, making it suitable for heating, air conditioning, and refrigeration equipment. It is also HID-rated for safely switching high-intensity discharge lighting circuits.

No. The 480Y/277VAC slash voltage rating limits this breaker to solidly grounded wye systems when operating at 480V. However, Schneider Electric does explicitly rate 2-pole and 3-pole EDB breakers for use on 240V corner-grounded delta systems (grounded B phase).

Yes, it features the Square D Visi-Trip indicator. When the breaker trips due to an overload or short circuit, the handle snaps to a middle position and a highly visible red flag appears in the indicator window, allowing electricians to quickly identify the tripped circuit in a fully populated panel.