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Eaton / Westinghouse QNP3050 Miniature Circuit Breaker
- 50A
- 3 Pole
- Plug-On
Eaton / Westinghouse
QNP3050
Miniature Circuit Breaker
Brand
Eaton / Westinghouse
SKU
QNP3050
Quantity
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Eaton / Westinghouse QNP3050 - 50A 3 Pole Miniature Circuit Breaker
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Description
Maintaining older electrical distribution systems requires exact-fit components like the Eaton QNP3050. This 50-amp, three-pole plug-on breaker provides essential thermal-magnetic protection with a 10kAIC interrupt rating at 240VAC, making it ideal for commercial facilities. It installs into legacy Westinghouse, Quicklag, and Eaton Pow-R-Line panels without modification. For users seeking current-generation equivalents, this legacy model is officially replaced by the QP3050 substitute.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | QNP3050-R |
| Series | QNP |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Eaton Pow-R-Line Panelboards, Westinghouse Panelboards, Quicklag Panelboards |
| Wire Gauge | 14-4 AWG |
| Max Wire | 4 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Visual Trip Indicator |
Product FAQs
9 answersWhat panelboards are compatible with the QNP3050?
This breaker is designed for use in legacy Westinghouse, Quicklag, and Eaton Pow-R-Line panelboards that accept plug-on Quicklag breakers.
Can I install this breaker in a residential Eaton BR or CH load center?
No. The QNP series is specifically designed for commercial Pow-R-Line and legacy Westinghouse panelboards. It will not fit standard residential BR or CH load centers.
How does this breaker mount into the panel?
The QNP3050 features a plug-on mounting style. It snaps directly onto the busbar of compatible Quicklag or Pow-R-Line panelboards, unlike the BAB series which requires bolted connections.
What wire sizes are accepted by the terminals on this 50A breaker?
The box lugs are designed to accept conductors ranging from 14 AWG to 4 AWG. Always verify the correct torque specifications based on the wire size and material used.
What does the LI trip function mean for this model?
The LI designation indicates a thermal-magnetic trip unit providing Long-Time (thermal overload) and Instantaneous (magnetic short-circuit) protection. Both trip settings are fixed and non-adjustable.
Can this 50A breaker be used on a 480V system?
No. The maximum voltage rating for this component is 240V AC. It is not rated for use on 480V or 277V electrical systems.
Is this breaker still manufactured under the Westinghouse brand?
Westinghouse electrical distribution equipment was acquired by Eaton. Depending on the production year, this exact component may be branded as Eaton, Cutler-Hammer, or Westinghouse.
What is the current-generation replacement for the QNP3050?
For users seeking a current-generation equivalent, this legacy model is officially replaced by the Eaton QP3050 circuit breaker.
What is the maximum continuous load permitted for this 50A breaker?
Standard molded case circuit breakers are rated for 80 percent continuous load unless marked otherwise. For this 50A breaker, the maximum continuous load should not exceed 40 amps.
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