Overview
The Square D QO320VH is a 20A, 3-pole QO miniature circuit breaker with plug-in mounting, rated for 120/240V AC and a 22kA interrupting capacity. Its thermal-magnetic mechanism provides overload and short-circuit protection for compatible three-phase equipment.
Key Features
-
Protection: Thermal-magnetic overcurrent protection with a common-trip, three-pole configuration.
-
Installation: Plug-in mounting uses three panel spaces; pressure-plate terminals accept 14–8 AWG copper or aluminum conductors.
-
Compatibility: Designed for compatible Square D QO load centers, NQ panelboards, and Speed-D switchboard distribution panels. Verify the equipment label before installation.
-
Performance: 20A rating with 22kA interruption at 120/240V AC and VisiTrip indication for faster fault identification.
Specifications
- Manufacturer part number: QO320VH
- Brand and family: Square D QO
- Current: 20A
- Poles: 3
- Phase: 3 phase
- Voltage: 120/240V AC
- Interrupting capacity: 22kA at 120/240V AC, 50/60 Hz
- Mounting: Plug-in
- Terminals: Pressure plate
- Conductor range: 14–8 AWG copper or aluminum
- Ambient rating: 40°C (104°F)
- Certifications and ratings: UL Listed, CSA certified, HACR rated
Common Applications
Overcurrent protection for compatible three-phase commercial and light-industrial QO distribution equipment, including HVAC and motor-group applications within the breaker rating. Follow the panel label, conductor requirements, and manufacturer installation instructions.
