Overview
The Square D QO120 miniature circuit breaker delivers dependable overcurrent and short-circuit protection for QO load centers and panelboards. This 1-pole breaker is rated at 20A at 120/240VAC and provides 10kA breaking capacity with plug-in mounting. Commonly used in residential and light commercial electrical systems, the QO120 offers proven reliability and fast switching action.
Key Features
- Over-center, trip-free toggle mechanism with quick make, quick break action and positive handle indication
- VisiTrip trip indication provides visual confirmation that the circuit breaker has tripped
- Plug-in mount design for secure installation in QO load centers
- Thermal magnetic trip design for overcurrent protection on AC and DC systems
- Switching Duty (SWD) rated for controlling fluorescent lighting loads
- Compatible with optional factory-installed accessories including shunt trips and auxiliary switches
Technical Specifications
The Square D QO120 meets industry standards for electrical protection equipment:
- Current Rating: 20A
- Voltage: 120/240V AC
- Interrupting Rating: 10,000 AIR (10kA)
- Poles: 1
- Mounting: Plug-in
- Dimensions – Height: 3.0 in (76 mm); Width: 0.7 in (19 mm); Depth: 2.9 in (74 mm)
- UL-listed under File E84967 and CSA-certified under Master Contract 153555
- Mechanism: Thermal Magnetic
- Switching Duty (SWD) Rated: Yes
Typical Applications
The Square D QO120 is built for residential and commercial applications, snapping firmly into Square D QO load centers, NQ panelboards, and Speed-D switchboards. Common uses include:
- Lighting and receptacle circuits in homes and small businesses
- Appliance circuits requiring 20-amp protection
- Light commercial installations
- Retrofit and maintenance of existing QO panelboards
- Bulk circuit protection for new construction or system upgrades
Compatibility & Replacements
Compatible With
- Square D QO load centers and panelboards
- Square D NQ panelboards
- Square D Speed-D switchboards
- CSED (Circuit Switching Equipment Devices)
- NQOD panel boards
Replaces / Drop-In Replacement For
The Square D QO120 is a direct replacement for any standard Square D 1-pole, 20A, 10kA QO-series miniature circuit breaker. Verify part compatibility with your load center manufacturer before ordering.
Works With
- Square D QO electrical distribution systems
- Standard 120/240V single-phase electrical panels
- Thermal magnetic overcurrent protection strategies
- Auxiliary switches and shunt trip devices (optional accessories)
