Overview
The Square D QO220 is a 2-pole, 20-amp miniature circuit breaker designed for thermal-magnetic overcurrent protection in 120/240VAC distribution systems. Built on the industry-leading QO platform since 1955, this breaker combines reliability with fast, tool-free installation via its plug-on connection to QO load centers and compatible panelboards.
Key Features
- Thermal-magnetic trip mechanism — quick make, quick break action with positive handle indication for reliable protection
- Visi-Trip indicator — visual red indicator snaps to midpoint position when breaker trips, enabling rapid fault identification
- Plug-on mounting — secure, tool-free connection to busbar for faster installation and service
- 10kA interrupting rating — rated for both 120/240V AC (50/60 Hz) and 48V DC applications
- UL and CSA certified — meets industry safety standards for residential and light commercial installations
Technical Specifications
- Current Rating: 20A
- Voltage Rating: 120/240V AC, 120V AC, 48V DC
- Interrupting Capacity: 10,000 AIR (10kA)
- Poles: 2
- Trip Type: Thermal-Magnetic
- Connection: Plug-In (Common Trip)
- Mounting: Plug-on to QO panelboards
- Certifications: UL Listed (File E84967), CSA Certified (Master Contract 153555)
- Dimensions: 3″ H × 1.50″ W × 3″ D
- Frequency: 50/60 Hz
Typical Applications
The QO220 is widely used in residential and light commercial electrical distribution for branch circuit protection. Common applications include:
- General-purpose branch circuits in homes and small commercial buildings
- Disconnect boxes and Wi-Fi installations
- Kitchen, bedroom, and bathroom outlets requiring 20A protection
- HVAC systems, water heaters, and other load-protected circuits
- Equipment serving as backup to main distribution centers
Compatibility & Replacements
Compatible With
- Square D QO load centers
- Square D NQ and NQOD panelboards
- Standard QO plug-on distribution systems
- Schneider Electric QO-series electrical panels
Replaces / Drop-In Replacement For
The QO220 is the standard 2-pole, 20A breaker in the QO family. Common alternate model numbers include QO220CP. Verify exact compatibility with your load center before ordering, as panelboard configurations vary by manufacturer and vintage.
Works With
- QO and QOB thermal-magnetic circuit breaker series
- Factory-installed accessories: shunt trips, auxiliary switches, alarm switches
- Standard electrical panel load balancing and overcurrent protection systems
- Both AC and DC electrical systems (within rated specifications)
