Square D is one of the most recognized and trusted names in the American electrical industry. Founded in 1902 and now owned by Schneider Electric, Square D produces a comprehensive range of circuit breakers for residential, commercial, and industrial applications. If you have Square D breakers to sell, or if you need to understand the value of your Square D inventory, this guide covers everything you need to know.
Square D Product Lines
QO Series (Residential) is Square D's premium residential line. QO breakers are known for their distinctive "Qwik-Open" mechanism, which trips the breaker to a visible middle position when it trips — making it easy to identify a tripped breaker in a panel. QO breakers are available in 15A to 200A ratings and include standard, AFCI, GFCI, and dual-function AFCI/GFCI versions.
Homeline Series (Residential Value) is Square D's more affordable residential line. Homeline breakers are compatible with Homeline load centers and are available in 15A to 200A ratings. They are not interchangeable with QO breakers or load centers.
I-Line Series (Commercial) is Square D's workhorse commercial product line. I-Line breakers use a plug-on connection that allows them to be installed and removed without tools, making them popular in commercial panelboards. They are available from 15A to 1200A.
PowerPact Series (Industrial) is Square D's industrial molded case circuit breaker line. PowerPact breakers are available in B-frame (15–125A), H-frame (15–250A), J-frame (70–400A), L-frame (125–600A), M-frame (200–800A), P-frame (400–1200A), and R-frame (600–2000A) configurations. These are high-value breakers with strong secondary market demand.
Masterpact Series (Large Industrial) covers Square D's air circuit breakers for main distribution applications. Masterpact NT and NW series breakers handle from 800A to 6300A and are among the most valuable circuit breakers on the secondary market.
Square D Model Numbers Explained
Square D model numbers encode key information about the breaker. For QO breakers, the model number typically starts with "QO" followed by the number of poles and the amperage rating. For example, QO120 is a 1-pole 20-amp breaker, QO230 is a 2-pole 30-amp breaker, and QO260 is a 2-pole 60-amp breaker.
For PowerPact breakers, the model number is more complex and encodes the frame size, interrupt rating, trip type, and amperage. The catalog number is the most reliable way to identify a specific PowerPact breaker.
Value of Square D Circuit Breakers
Residential QO and Homeline breakers have modest individual value — typically $5 to $25 each depending on amperage and type. However, they sell well in quantity. A lot of 50 to 100 residential breakers can add up quickly.
Commercial I-Line breakers are worth more — typically $20 to $200 each depending on amperage and configuration.
Industrial PowerPact breakers are where the real value lies. A PowerPact H-frame 250A breaker might be worth $150 to $400. A PowerPact P-frame 1200A breaker could be worth $500 to $2,000 or more. Masterpact air circuit breakers can be worth $1,000 to $10,000+ depending on the model and amperage.
Selling Your Square D Breakers
Electrical Breaker Buyers purchases Square D circuit breakers of all product lines and amperage ratings. We buy QO, Homeline, I-Line, PowerPact, and Masterpact breakers — new in box, new without box, and tested used. Call us at 951-733-6603 for a free quote. We respond within 24 hours and arrange free pickup for large lots.