Overview
The Square D QO140 is a 40 Amp, 1-pole thermal-magnetic circuit breaker for compatible Square D QO load centers and NQ panelboards. It is rated 120/240 VAC with a 10 kA interrupting rating and uses a compact plug-in design with the QO Visi-Trip indicator for quick identification of a tripped circuit.
Key Features
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Safety: UL Listed, CSA Certified, and HACR rated, with thermal-magnetic overload and short-circuit protection.
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Installation: Plug-in mounting and box-lug terminals accept 8-2 AWG copper or aluminum conductors.
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Compatibility: Designed for compatible Square D QO load centers and NQ panelboards; QO and Homeline breakers are not interchangeable.
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Performance: 40 Amp, single-pole protection at 120/240 VAC with 10 kA interrupting capacity and a 104°F (40°C) ambient rating.
Specifications
- Manufacturer: Square D by Schneider Electric
- Model: QO140
- Series: QO
- Amperage: 40 A
- Poles: 1
- Phase: 1
- Voltage: 120/240 VAC
- Interrupting Rating: 10 kA
- Protection: Thermal Magnetic
- Mounting: Plug-In
- Terminal: Box Lug
- Wire Range: 8-2 AWG copper or aluminum
- Ambient Rating: 104°F (40°C)
Common Applications
- Residential branch-circuit protection in compatible Square D QO load centers.
- Light-commercial circuits in compatible NQ panelboards.
- HVAC and other HACR-rated applications requiring a 40 A single-pole breaker.
- Replacement or expansion work where the exact QO140 configuration is specified.
