GE THQL vs Square D QO: Complete Comparison Guide

GE THQL and Square D QO are both popular residential circuit breaker lines, but they serve different market segments. The GE THQL is a standard 10,000 AIC plug-in breaker for GE residential loadcenters, while the Square D QO is also a 10,000 AIC plug-in breaker for QO panels. Both are widely available, but they differ in features, pricing, and upgrade paths. This guide compares every specification to help you understand which line fits your needs.

GE THQL vs Square D QO Comparison

NOT Interchangeable — Different Manufacturers, Different Panels

GE THQL breakers will NOT fit in a Square D QO panel, and QO breakers will NOT fit in a GE panel. The bus stab geometry, clip design, and panel slot dimensions are completely different between manufacturers. If you already have a panel installed, your choice is made — look at the panel door label to confirm the manufacturer and buy matching breakers.

The High-AIC Upgrade Path (GE THQL)

GE’s biggest advantage is the THHQL series — a high-interrupting version rated at 22,000 AIC that is a direct drop-in replacement for standard THQL breakers. Same panel, same slot, same wiring — just swap the breaker. This is critical if your available fault current exceeds 10,000A (common near utility transformers). Square D QO does not offer a high-AIC version in the same plug-in form factor, so you’d need to change panel types entirely to get higher AIC protection.

The Visi-Trip Advantage (Square D QO)

Square D QO breakers include the patented Visi-Trip indicator — a small orange flag that appears when the breaker has tripped. This makes it instantly obvious which breaker tripped in a crowded panel. GE THQL breakers don’t have this feature. You need to carefully inspect each handle position to find the tripped breaker. For homeowners who rarely open their panel, Visi-Trip is a genuine convenience.

Price Comparison

GE THQL breakers are typically $1–$3 cheaper per unit than equivalent Square D QO breakers. A standard THQL1120 (20A single-pole) runs $6–$10, while a QO120 runs $8–$12. The difference is smaller than BR vs QO, but still meaningful on a full panel build-out. GE panels are also competitively priced. The THHQL high-interrupting version adds about $5–$8 per breaker over standard THQL.

Availability and Parts Supply

Square D QO has the largest installed base and the widest parts availability — you can find QO breakers at virtually any hardware store in North America. GE THQL is the third most common residential breaker (behind QO and Eaton BR) and is available at Home Depot, Lowe’s, and electrical supply houses. However, in some rural areas, GE breakers may be harder to find than QO. Both lines have been manufactured for decades and show no signs of discontinuation.

GE to ABB Transition

In 2018, ABB acquired GE’s industrial solutions division, including the THQL breaker line. The breakers are now manufactured by ABB but retain the GE catalog numbers and are fully backward-compatible with all existing GE panels. If you see breakers labeled ‘ABB’ or ‘GE’ with THQL numbers, they’re the same product. This transition has not affected quality, availability, or compatibility.

Verdict

If you already have a panel, buy matching breakers. For new construction, choose GE THQL if you want the THHQL high-AIC upgrade path (important near transformers) or prefer the lower price point. Choose Square D QO if you want the Visi-Trip indicator, the largest parts availability network, or your electrician prefers Square D. Both are quality 10,000 AIC breakers meeting identical UL standards.

Frequently Asked Questions

Can I use a GE THQL breaker in a Square D QO panel?

No. THQL and QO breakers have completely different bus stab designs and mounting clips. They are NOT interchangeable. Using the wrong breaker is a code violation and fire hazard.

Is GE still making THQL breakers?

Yes. ABB acquired GE's breaker division in 2018 and continues manufacturing THQL breakers with the same catalog numbers. They are fully backward-compatible with all existing GE panels.

What's the advantage of THHQL over QO?

THHQL has a 22,000 AIC rating (vs 10,000 AIC for QO) and is a direct drop-in replacement for standard THQL in GE panels. If you need high fault current protection, GE panels with THHQL breakers are an excellent solution without changing panel types.

Which is more reliable, GE or Square D?

Both are manufactured by major multinational corporations (ABB and Schneider Electric) with extensive quality control. Neither has a meaningful reliability advantage. Both meet identical UL standards and have similar service life expectations.