Square D EDB24025 Miniature Circuit Breaker

This E-frame breaker is designed exclusively for Square D NF series panelboards. It features a bolt-on connection that secures directly to the NF panel bus.

No. Square D NQ panelboards require QO or QOB series breakers. The EDB24025 is built specifically for the 277/480V-rated NF panelboard architecture.

The 480Y/277V rating indicates the breaker is approved for use on solidly grounded wye systems where the line-to-ground voltage does not exceed 277V. It is not suitable for ungrounded 480V delta systems.

Yes. While it has a maximum rating of 480Y/277VAC, it is fully rated for 120/240VAC and 240VAC systems. When used at these lower voltages, it provides a higher 25kA interrupting rating.

All three are E-frame breakers that share the same physical dimensions and NF panel compatibility. They differ only in their interrupting capacity (AIC). EDB is the standard tier (18kA at 480Y/277V), EGB is high-interrupting (35kA), and EJB is extra-high-interrupting (65kA).

Square D E-frame breakers require one inch of space per pole. This 2-pole breaker will occupy two inches of bus space in an NF panelboard.

The factory-installed lugs accept both copper and aluminum conductors. The approved wire range is 14 to 6 AWG for copper and 12 to 6 AWG for aluminum.

Yes. Standard EDB circuit breakers do not have Line and Load markings, meaning they can be safely backfed in AC applications like solar or generator inputs. Note that they are not DC rated.

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 midpoint position and a highly visible red indicator appears to help quickly identify the faulted circuit.

This breaker utilizes a thermal-magnetic trip unit with fixed Long-Time and Instantaneous functions. The thermal element provides overload protection, while the magnetic element protects against short circuits.