Federal Pacific 3P50 NA350 - 50A 3 Pole Molded Case Circuit Breaker
- 50A
- 3 Pole
- Plug-On
Quantity
Federal Pacific NA350 - 50A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Restoring commercial and industrial electrical systems requires exact-fit components like this 50A three-pole breaker. It provides reliable thermal-magnetic protection for aging infrastructure. Designed specifically for Federal Pacific Stab-Lok load centers, it installs without the need for aftermarket adapters. Facility managers can use this unit to replace discontinued UBIF350N models seamlessly.Specifications
| Brand | Federal Pacific |
|---|---|
| Series | NA |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific Stab-Lok Load Centers |
| Wire Gauge | 8-2 AWG (Cu/Al) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, HACR Rated |
Product FAQs
6 answersWhat load centers are compatible with the Federal Pacific NA350 circuit breaker?
The NA350 is designed exclusively for use in Federal Pacific Electric (FPE) Stab-Lok load centers. It features a plug-on mounting style that fits directly into the original FPE busbar without aftermarket adapters.
Is there a modern replacement for the Federal Pacific NA350 or 3P50 breaker?
Yes. The Connecticut Electric UBIF350N is a direct, modern replacement for the original Federal Pacific NA350 and 3P50 circuit breakers. It is manufactured to fit the same Stab-Lok panels while meeting current safety standards.
Are there safety concerns associated with Federal Pacific Stab-Lok breakers?
Yes. Original Federal Pacific Electric (FPE) Stab-Lok panels and breakers have a documented history of failing to trip during overloads or short circuits, which poses a significant fire hazard. Many electrical inspectors and insurance carriers recommend replacing the entire Stab-Lok panel rather than installing replacement breakers.
What wire sizes are accepted by the lugs on the NA350 breaker?
The terminal lugs on this 50-amp breaker accept copper or aluminum wire ranging from 8 AWG to 2 AWG. Ensure proper torque specifications are followed during installation to prevent loose connections.
What type of trip mechanism does the Federal Pacific 3P50 use?
This breaker utilizes a fixed thermal-magnetic trip mechanism. It includes both long-time (thermal) protection for sustained overloads and instantaneous (magnetic) protection for short circuits.
Can the NA350 breaker be used on systems with high fault currents?
The NA350 has a maximum interrupting rating of 10kAIC at 240VAC. It is not suitable for applications where the available fault current exceeds 10,000 amps.
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