NF Panelboards are versatile panelboards that feature a wide selection of circuit breakers, accessories, and ready to install kits. NF Panelboards have modular construction to accept field installable accessories and conversion kits. This panelboard accessory is a breaker kit used for sub feed systems. This kit is rated at 250A and for H frame breakers. This sub feed breaker kit is UL listed and CSA certified by UL.