Air Circuit Breakers (ACBs)
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New, Recertified & Obsolete Air Circuit Breakers — In Stock and Ready to Ship
Key Takeaways
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Essential Electric Supply stocks new, reconditioned, surplus, and obsolete air circuit breakers (ACBs) from major brands including Westinghouse, GE, Siemens, Eaton, ABB, and Square D.
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Air circuit breakers are fully serviceable draw-out protection devices designed for low-voltage power distribution systems in industrial switchgear, data centers, utilities, and commercial facilities.
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Unlike molded case or insulated case breakers, ACB circuit breakers can be withdrawn, inspected, maintained, and returned to service without replacing the entire unit.
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Every reconditioned ACB circuit breaker is tested and reconditioned to NETA and NEMA standards, backed by a two-year warranty, and can provide significant cost savings compared to new equipment.
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Essential Electric Supply offers same-day or next-day shipping, 24-hour emergency support, and sourcing assistance for discontinued or hard-to-find ACB circuit breaker models and retrofits.
Essential Electric Supply is a leading source for in-stock and hard-to-find air circuit breakers (ACBs), delivering new, reconditioned, surplus, and obsolete units with same-day and next-day shipping. When a high-capacity distribution system goes down and lead times on new equipment are weeks out, we help you secure the exact ACB you need fast, including discontinued models most suppliers can no longer source.
An air circuit breaker (ACB) is a fully serviceable, draw-out protection device used in low-voltage power distribution systems rated from 800 to 6300A. Unlike a molded case circuit breaker (MCCB), which is a sealed unit designed for branch-level protection, or an insulated case circuit breaker (ICCB), which offers a more compact footprint but limited serviceability, an ACB is designed to be withdrawn from its cradle, inspected, maintained, and returned to service without replacing the unit. This draw-out serviceability is the defining reason ACBs are specified for main distribution boards, large commercial and industrial switchgear lineups, utility substations, data centers, and any installation where scheduled maintenance access is an operational requirement.
We stock new, reconditioned, surplus, and obsolete ACBs from the industry’s most trusted brands, including Westinghouse, ITE, GE, Square D, Cutler-Hammer, Eaton, ABB, and Siemens, as well as discontinued lines that are increasingly difficult to source through standard channels.
Every order ships with:
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Same-day or next-day shipping on in-stock orders placed before 1:30 PM PT
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24-hour emergency support line for urgent needs
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Two-year warranty on all reconditioned units
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30-day return policy on all orders
Shop Our Air Circuit Breakers
We stock new, reconditioned, surplus, and obsolete ACBs from the industry’s most trusted names, all in one place and ready to ship:
Brands: Westinghouse, ITE, GE, Square D, Cutler-Hammer, Eaton, ABB, Siemens, and additional obsolete and discontinued lines
Our inventory covers a broad range of frame sizes, amperage ratings, and trip unit configurations for low-voltage main distribution applications. Whether you’re sourcing a current-production unit or tracking down a discontinued frame for an aging switchgear lineup, we have the stock and the sourcing depth to move quickly.
Every reconditioned ACB circuit breaker is tested and reconditioned to NETA and NEMA standards before it ships, ensuring the unit performs to OEM specifications when it arrives on site. Reconditioned units are backed by our two-year warranty. Reconditioned ACB circuit breakers typically cost 30–60% less than new. If the exact frame or model you need has been discontinued, our team can identify authorized replacements and retrofits compatible with your existing switchgear or distribution panel.
With same-day and next-day shipping on in-stock orders placed by 1:30 PM PT, multiple ship points across North America, and a 24-hour emergency support line for urgent orders, we’re ready when a distribution failure can’t wait.
For urgent orders or large-volume requests, call our 24-hour support line or submit a quote request today.
Frequently Asked Questions
Do you offer same-day or next-day shipping on air circuit breakers?
Yes. Orders placed by 1:30 PM PT on in-stock ACBs ship the same day or next day via UPS. Free UPS Ground shipping is available on orders over $250 within the continental United States, and expedited after-hours air delivery is available for time-critical situations. With multiple shipping points across North America, most customers receive their parts quickly regardless of location.
Do you stock obsolete ACB brands?
Yes. We carry obsolete and discontinued ACB circuit breakers from brands including Westinghouse, ITE, GE, Square D, Cutler-Hammer, Eaton, ABB, and Siemens, including frames that have been off the market for years. If you’re sourcing for an aging main distribution board or switchgear lineup and can’t find the part through standard channels, contact our team with your part number, and we’ll track it down.
Are your reconditioned ACBs tested before they are shipped?
Yes. Every reconditioned air circuit breaker is tested and reconditioned to NETA and NEMA standards before leaving our warehouse. Reconditioned units ship with our two-year warranty, the same coverage applied to new stock, and all orders are backed by our 30-day return policy.
What is the difference between a reconditioned, refurbished, and remanufactured ACB?
The terms are used inconsistently across the industry, but generally, a reconditioned unit has been inspected, cleaned, tested, and returned to OEM performance specifications with worn components replaced. A refurbished unit may have received only cosmetic attention with limited electrical testing. A remanufactured unit has been disassembled to the component level and rebuilt. At Essential Electric Supply, reconditioned means tested to NETA and NEMA standards and backed by our two-year warranty.
What if the exact ACB model I need is no longer available?
Reach out to our team, and we’ll help find what you need. Have your catalog number or part number ready, and if the breaker is still installed, photos of the nameplate from multiple angles — showing amperage, voltage rating, frame type, and interrupting capacity — will help our team move quickly. If the exact unit is no longer available, we can identify authorized replacements or retrofits compatible with your existing switchgear or distribution panel.
How do I identify my air circuit breaker before contacting a supplier?
Locate the nameplate on the breaker itself, not just the panel label. The nameplate should show the manufacturer name, catalog or part number, frame designation, continuous ampere rating, voltage rating, interrupting capacity (kAIC or kA), and number of poles. If the nameplate is worn or missing, note the panel manufacturer, switchgear model, and approximate installation date. Photos of the breaker from the front, sides, and nameplate will give a supplier the best chance of identifying a match or a compatible replacement quickly.
