Federal Pacific NA2P100 Miniature Circuit Breaker

This device fits Stab-Lok load centers manufactured by Federal Pacific Electric, Federal Pioneer, and American Circuit Breaker Company. It is specifically designed for panels accepting thick NA-type profiles.

As a thick NA-series breaker, it measures 1 inch per pole. The total width of this 2-pole component is 2 inches, meaning it requires two full-size spaces on the panel bus bar and cannot be installed in narrow 1/2-inch thin NB-series slots.

Yes. Connecticut Electric manufactures a UL-listed direct replacement for this 100-amp Stab-Lok breaker under the UBI brand. The modern equivalent is typically found under part number UBIF2100N.

Yes. Because Federal Pacific, Federal Pioneer, and American all shared the same Stab-Lok design, this breaker serves as a direct cross-reference for any 100-amp, 2-pole NA-type breaker from those legacy brands.

Due to its high capacity, this device is frequently installed as a main disconnect in small Stab-Lok panels, a subpanel feeder breaker, or to supply power to large residential loads like whole-home electric heating systems.

It utilizes the proprietary Stab-Lok plug-on design. The back of the breaker features specialized slotted metal prongs that push directly onto the panel bus bar, which differs from standard stab-in or bolt-on mounting mechanisms used by other legacy manufacturers.

Yes. Industry professionals frequently note that original FPE Stab-Lok breakers have a documented history of failing to trip during overloads or short circuits. While replacing a faulty breaker restores immediate function, many electricians recommend a full panel upgrade for long-term safety.

Older original Federal Pacific breakers are sometimes known to show the handle in the off position while the internal contacts remain closed and energized. Always use a reliable multimeter to verify the circuit is dead before performing any electrical work downstream of this breaker.