Federal Pacific NA40 – 40A 1 Pole Miniature Circuit Breaker Top Pick

Maintaining older residential panels is straightforward with the NA40 single-pole breaker. Operating at 120/240VAC, it delivers essential thermal-magnetic trip functions for 40-amp branch circuits. It fits seamlessly into classic Federal Pacific Stab-Lok enclosures, eliminating the need for complex retrofits. This full-size, one-inch component serves as an exact match for the UBIF0140N substitute. Built to UL 489 standards, it ensures safe operation with a standard 10kA interrupting capacity.