Air Circuit Breakers

While our website showcases a large assortment of our products, it does not reflect the complete inventory of products currently available. For real-time availability and to ensure we can meet your specific needs, please contact our sales team at 1-800-328-1842. New products arrive daily and our knowledgeable staff are happy to assist you in locating the exact item(s) you need.

DMB25 Federal Noark 600A Frame/200A Rated 600V MO/DO Air Breaker LI

Federal Noark DMB25 air circuit breaker; 600 amp frame, 200 amp trip. FPE solid state trip unit with L-I functions, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB25 EMSCO #21207

DMB25 Federal Noark 600A Frame/250A Rated 600V MO/DO Air Breaker

Federal Noark DMB25 air circuit breaker; 600 amp frame, 250 amp trip, dual magnetic over current trip 50L1, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB25 EMSCO #21205

DMB25 Federal Noark 600A Frame/400A Rated 600V MO/DO Air Breaker

Federal Noark DMB25 air circuit breaker; 600 amp frame, 400 amp trip dual magnetic, over current trip 50L1, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB25 EMSCO #21206

DMB-50 1600A 600V Federal Noark MO/DO Air Breaker

Federal Noark DMB-50 Air Circuit Breaker; 1600 amp, 600 volt, 3 pole. Manually-operated, draw-out. Used electrically OK.
SKU: DMB-50 EMSCO#20436

DMB-50 1600A 600V Federal Noark MO/DO Air Breaker

Federal Noark DMB-50 Air Circuit Breaker; 1600 amp, 600 volt, 3 pole. Manually-operated, draw-out. Used electrically OK.
SKU: DMB-50 EMSCO#20435

DMB50 Federal Noark 1600A Frame/175A Rated 600V MO/DO Air Breaker

Federal Noark DMB50 air circuit breaker; 1600 amp frame, 175 amp trip dual magnetic, over current trip 50H1, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB50 EMSCO #20441

DMB50 Federal Noark 1600A Frame/300A Rated 600V MO/DO Air Breaker

Federal Noark DMB50 air circuit breaker; 1600 amp frame, 300 amp trip dual magnetic, over current trip 50L1, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB50 EMSCO #20440

DMB50 Federal Noark 1600A Frame/300A Rated 600V MO/DO Air Breaker

Federal Noark DMB50 air circuit breaker; 1600 amp frame, 300 amp trip dual magnetic, over current trip 50L1, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB50 EMSCO #20500

DMB50 Federal Noark 1600A Frame/300A Rated 600V MO/DO Air Breaker

Federal Noark DMB50 Air circuit breaker; 1600 amp frame, 300 amp trip dual magnetic, over current urip 50L1, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB50 EMSCO #21204

DMB50 Federal Noark 1600A Frame/300A Rated 600V MO/DO Air Breaker

Federal Noark DMB50 air circuit breaker; 1600 amp frame, 300 amp trip, dual magnetic over current trip 50L1, 600 volt. Manually operated, draw-out, Used electrically OK ***Breaker has Broken Front Fiberboard*** See last picture. Used electrically OK.
SKU: DMB50 EMSCO #20300

DMB50 Federal Noark 1600A Frame/350A Rated 600V MO/DO Air Breaker

Federal Noark DMB50 air circuit breaker; 1600 amp frame, 350 amp trip, dual magnetic over current trip 50M1, 600 volt. Manually operated, draw-out. Used electrically OK ***Breaker has Cracked Insulators***
SKU: DMB50 EMSCO #20438

DMB50 Federal Noark 1600A Frame/400A Rated 600V MO/DO Air Breaker

Federal Noark DMB-50 air circuit breaker; 1600 amp frame, 400 amp trip, dual magnetic, over current trip 50N1, 600 volt. Manually operated, draw-out. Used electrically OK.
SKU: DMB50 EMSCO #20439

Federal Noark DMB-25 600A 600V 3P MO/DO Air Breaker

Federal Noark DMB-25 Air Circuit Breaker; 600 amp, 600 volt, 3 pole, Manually-operated, draw-out. Used Electrically OK.
SKU: DMB-25 EMSCO#20429

Federal Noark DMB-50 1600A 600V 3P MO/DO Air Breaker

Federal Noark DMB-50 Air Circuit Breaker; 1600 amp, 600 volt, 3 pole, Manually-operated, draw-out. Used Electrically OK.
SKU: DMB-50 EMSCO#20431

Used and Refurbished Air Circuit Breakers

Air Circuit Breakers (ACB’s) use air to extinguish electrical sparks. When a fault occurs, these circuit breakers disrupt the circuit by releasing a burst of compressed air, extinguishing the arc. This isolates the defective section of the system, preventing damage. High-pressure air cools the electrical arc.

Inventory Selection of Air Circuit Breakers to Match and Replace Yours

Our inventory features a wide range of air circuit breaker types to match and replace your existing electrical equipment seamlessly, ensuring compatibility and optimal performance for different applications. Whether you need a specific voltage rating, current capacity, or unique design, we have options that suit your needs.

New and Refurbished Air Circuit Breakers -- It's Your Choice

We offer customers the flexibility to choose between new and refurbished ACB’s. New circuit breakers ensure the latest technology and warranties, while refurbished breakers provide cost-effective solutions without compromising quality, backed by thorough inspections and testing.

Electrical testing equipment Certifies Quality and Performance

Our products undergo rigorous electrical testing using the newest test equipment to guarantee quality, safety, and optimal performance. Each air circuit breaker is thoroughly inspected, ensuring it meets industry standards and specifications.

Specifications Based on Your Power Requirements

To specify the right air circuit breaker, consider power requirements such as voltage, current rating, breaking capacity, and the type of application. In most cases, air circuit breakers are used where there’s high risk of fire or explosion. Air Breakers are typically used for low voltages up to 15KV.

Our expert team can guide you through selecting the most suitable breaker for your specific power needs.

What Type of Air Circuit Breaker Do You Need?

Air Breaker Type

How the Breaker Type Works

Applications

Plain Break Air Breaker

Utilizes a pair of contacts within a chamber filled with air to interrupt the electrical circuit. When the contacts separate, an arc forms and is extinguished by the surrounding air.

Commonly used in low-voltage applications like residential and commercial settings, protecting against overcurrents and short circuits.

Magnetic Blowout Air Breaker

Uses a magnetic field to drive the arc away from the contacts, ensuring quick interruption and extinguishing of the arc. The magnetic force redirects the arc into a chute, effectively extinguishing it.

Often found in industrial and heavy-duty settings due to their capability to handle high fault currents, making them ideal for heavy machinery and large-scale equipment protection.

Air Chute Breaker

Uses a series of parallel plates to create a chute for the arc. When the contacts open, the arc is diverted into the chute, where it is elongated, cooled, and extinguished before being directed toward the exhaust vent.

Commonly applied in medium-voltage power distribution systems, particularly in substations, to protect transformers and other critical power equipment from faults and overloads.

Air Blast Breaker

Relies on a high-pressure air blast to extinguish the arc. The compressed air directed towards the arc causes rapid cooling and interruption, ensuring efficient breaking of the circuit.

Primarily utilized in high-voltage applications like power stations and critical infrastructure such as data centers and hospitals, offering reliable protection against high fault currents and maintaining system integrity.