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Federal Pacific NA40 Miniature Circuit Breaker
- 40A
- 1 Pole
- Plug-On
Federal Pacific
NA40
Miniature Circuit Breaker
Brand
Federal Pacific
SKU
NA40
Quantity
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Federal Pacific NA40 - 40A 1 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Federal Pacific NA40 - 40A 1 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NA40 |
| Series | NA |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | NA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Stab-Lok Load Centers |
| Wire Gauge | 14-2 AWG |
| Max Wire | 2 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Stab-Lok System, Full Size (1 inch per pole) |
Quantity
Federal Pacific NA40 - 40A 1 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NA40-R |
| Series | NA |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | NA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Stab-Lok Load Centers |
| Wire Gauge | 14-2 AWG |
| Max Wire | 2 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Stab-Lok System, Full Size (1 inch per pole) |
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Description
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.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NA40 |
| Series | NA |
| Amperage | 40A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | NA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Stab-Lok Load Centers |
| Wire Gauge | 14-2 AWG |
| Max Wire | 2 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Stab-Lok System, Full Size (1 inch per pole) |
Product FAQs
5 answersWhat panels are compatible with the Federal Pacific NA40?
The NA40 is designed exclusively for legacy Federal Pacific Stab-Lok load centers. It features the proprietary Stab-Lok plug-on connection and will not fit in standard interchangeable panels from other manufacturers.
What is the difference between Federal Pacific NA and NC series breakers?
The NA series, including the NA40, are full-size breakers that require 1 inch of space per pole. The NC series are half-size, or thin, breakers that require only 0.5 inches of space per pole. Ensure your panel has the appropriate physical space for a 1-inch breaker.
Is there a modern replacement or cross-reference for the FPE NA40?
Yes, the Connecticut Electric UBIF0140N is a direct aftermarket replacement designed to fit the same Stab-Lok panels and match the specifications of the original NA40.
How does the NA40 connect to the panel busbar?
It uses the proprietary Stab-Lok plug-on mechanism. The breaker features a specialized jaw that clips directly onto the FPE busbar. It must be seated firmly to ensure a secure electrical connection and prevent overheating.
Are there safety concerns when replacing breakers in Federal Pacific Stab-Lok panels?
Yes. Legacy FPE Stab-Lok panels have a documented history of breakers failing to trip under overcurrent conditions and busbar arcing. When installing a replacement NA40, thoroughly inspect the panel busbars for pitting, burn marks, or loose connections. Many licensed electricians recommend a complete panel upgrade for long-term safety.
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