Issue:
Subfeed circuit breaker compatibility and wire size requirements for SB324QR Speed D Switchboard

Product Line:
Schneider Electric Speed D Switchboard – SB324QR

Resolution:
The SB324QR Speed D Switchboard includes provisions for installing two HLP or JLP subfeed circuit breakers. The loadside lug capabilities vary depending on the frame and ampacity of the breaker selected:

• H Frame (100–150A): Accepts wire sizes from #14 to 3/0 AWG
• J Frame (175A): Accepts wire sizes from #4 to 4/0 AWG
• J Frame (200–225A): Accepts wire sizes from 3/0 to 350 kcmil

These provisions allow for flexible subfeed configurations based on your specific load requirements and the selected breaker type.

For additional technical documentation, including dimensions and drawings, refer to the online Digest or Schneider Electric’s product selector tools.

Released for: Schneider Electric USA