Overview
The Square D QO220 is a thermal-magnetic miniature circuit breaker engineered for overload and short-circuit protection in residential and commercial electrical systems. This 2-pole, 20-amp breaker operates at 120/240 VAC and delivers a 10 kA interrupt rating, making it suitable for standard branch circuits in QO load centers, NQ panelboards, and NQOD panelboards. The plug-on design enables tool-free, secure installation without additional hardware.
Key Features
- Thermal-Magnetic Trip: Provides reliable overload and short-circuit protection for conductors and equipment.
- Visi-Trip Indicator: Red visual trip flag offers immediate visual confirmation when the breaker has tripped and interrupted the circuit.
- Quick-Make, Quick-Break Action: Overcenter toggle mechanism ensures positive handle indication and rapid fault clearing.
- Plug-On Mount: Tool-free connection to busbar simplifies installation and replacement in QO distribution systems.
- HACR Rated: Suitable for heating, air conditioning, and refrigeration applications.
- UL 489 Listed: Meets safety standards for miniature circuit breakers.
Technical Specifications
The Square D QO220 combines compact design with robust electrical performance. All poles trip simultaneously on any overcurrent condition, ensuring coordinated protection across the circuit.
Typical Applications
- Residential branch circuits in single-phase or multi-phase distribution panels
- Commercial electrical distribution systems
- HVAC circuits requiring HACR-rated breaker protection
- General-purpose electrical load protection in QO panelboards
- Equipment replacement and panel upgrades
Compatibility & Replacements
Compatible With
- Square D QO load centers and distribution panels
- NQ and NQOD panelboards
- OEM mounting bases compatible with QO breaker design
- Speed D switchboard distribution panels
- Standard single-phase 120/240 VAC electrical systems
Replaces / Drop-In Replacement For
- Other Square D QO-series 20A 2-pole breakers (standard QO220 base model)
- Legacy thermal-magnetic 20A breakers in compatible QO frames
- QO220CP (consumer-packaged variant of standard QO220)
Works With
- Pressure-plate wire terminals compatible with 14–8 AWG copper or aluminum conductors
- Standard electrical distribution design practices per UL 489
- Thermal-magnetic protection coordination in branch-circuit applications
