QO 40 Amp 3-Pole 240V Plug-in Circuit Breaker
SKU: EQO340
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Features
Specifications
Built for commercial and industrial applications, the Square D QO340 delivers 40 amps of thermal-magnetic protection in a three-pole configuration. This miniature circuit breaker is designed to integrate seamlessly into QO load centers and NQ panelboards. The plug-on mounting style ensures a secure connection, while the box lug terminals accommodate 8-2 AWG copper or aluminum wire. A standout feature is the signature Visi-Trip indicator, which provides a highly visible red flag when tripped.
| Brand | Square D |
|---|---|
| Date Added | May 28, 2026 |
| UPC | 785901695851 |
| Store Location (Lititz, PA) | Aisle 08, Section D2 |
| Package Length (in) | 3.80" |
| Package Width (in) | 2.30" |
| Package Height (in) | 3.40" |
| Manufacturer Part Number | QO340 |
| Series | QO |
| Part Number | QO340 |
| Amperage | 40A |
| Voltage | 240VAC, 120/240VAC, 48VDC |
| Poles | 3 |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 120/240VAC, 5kA @ 48VDC |
| Mounting Style | Plug-On |
| Terminal Type | Box Lugs |
| For Use With | QO Load Centers, NQ Panelboards |
| Trip Technology | Thermal Magnetic |
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Wire Gauge | 8-2 AWG (Cu/Al) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated |