Eaton / Westinghouse QNP3040 Miniature Circuit Breaker
- 40A
- 3 Pole
- Plug-On
Quantity
Eaton / Westinghouse QNP3040 - 40A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
Description
A drop-in replacement for older Westinghouse and Quicklag panelboards, the Eaton QNP3040 provides reliable thermal-magnetic protection for commercial applications. This 40-amp, three-pole breaker delivers 10kAIC interrupting capacity at 240VAC. Designed for plug-on mounting, it installs into Eaton Pow-R-Line enclosures without aftermarket adapters. While this QNP model is a legacy component, it serves as an exact fit for systems that have not yet transitioned to the newer QP3040 substitute.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | QNP3040-R |
| Series | QNP |
| Amperage | 40A |
| 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
4 answersWhat is the modern replacement for the legacy QNP3040 circuit breaker?
The Eaton QP3040 is the direct modern substitute for the QNP3040. It provides the same plug-on form factor and electrical ratings for systems that have not yet transitioned to the newer QP series.
Why is this breaker listed under both Eaton and Westinghouse?
Eaton acquired the Westinghouse electrical distribution business. Legacy Westinghouse breakers like the QNP series are now supported under the Eaton and Cutler-Hammer brands.
Does the QNP3040 require mounting adapters for Eaton Pow-R-Line panels?
No, this plug-on breaker installs directly into Eaton Pow-R-Line enclosures, as well as legacy Westinghouse and Quicklag panelboards, without the need for aftermarket mounting hardware.
What does the LI trip function code indicate on the QNP3040?
The LI designation means this breaker uses a fixed thermal-magnetic trip unit equipped with long-time (L) protection for sustained overloads and instantaneous (I) protection to quickly clear short circuits.
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