1-800-328-1842
Browse EMSCO's online catalog Browse Store
Busway & Plugs
Bus Plugs Bus Duct Tap Boxes & Accessories
Circuit Breakers
Molded & Insulated Case Circuit Breakers Air Circuit Breakers Vacuum Circuit Breakers Motor Circuit Protectors
Switches
Panelboard Switches Pressure Contact Switches Safety Switches Transfer Switches
Motor Control
MCC Buckets & Structure Starters Variable-Frequency Drive (VFD)
Switchgear
Low Voltage Switchgear Medium Voltage Switchgear
Transformers
Low Voltage Transformers Medium Voltage Transformers Auto-Transformers

Air Circuit Breakers

Home > Store > Circuit Breakers > Air Circuit Breakers

Manufacturer
Amperage
Condition
Fixed Mount or Draw Out
Frame
Functions
Medium or Low Voltage
Operation
Voltage
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.
Picture of DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

Westinghouse DS-632 low voltage AC power circuit breaker; 600 volt, 3200 amp. Electrically operated, draw-out, 120 VAC, Amptector Model with LS functions. Used electrically used OK.
SKU: DS-632-EO-DO-#22921
$6,500.00
View product Add to cart
Picture of DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

Westinghouse DS-632 low voltage AC power circuit breaker; 600 volt, 3200 amp. Electrically operated, draw-out, 120 VAC, Amptector Model with LS functions. Used electrically OK.
SKU: DS-632-EO-DO-#22922
$6,500.00
View product Add to cart
Picture of DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

Westinghouse DS-632 low voltage AC power circuit breaker; 600 volt, 3200 amp. Electrically operated, draw-out, 120 VAC, Amptector Model with LS functions. Used electrically OK.
SKU: DS-632-EO-DO-#22923
$6,500.00
View product Add to cart
Picture of DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LS

Westinghouse DS-632 low voltage AC power circuit breaker; 600 volt, 3200 amp. Electrically operated, draw-out, 120 VAC, Amptector Model with LS functions, Used electrically OK.
SKU: DS-632-EO-DO-#22924
$6,500.00
View product Add to cart
Picture of DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LSI

DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LSI

Westinghouse DS-632 low voltage AC power circuit breaker; 600 volt, 3200 amp. Electrically operated, draw-out, 120 VAC, Amptector I A Model with LSI functions. Used electrically OK.
SKU: DS-632-EO-DO-#22981
$6,500.00
View product Add to cart
Picture of DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LSI

DS-632 Westinghouse Air Breaker 600V 3200A EO/DO LSI

Westinghouse DS-632 low voltage AC power circuit breaker; 600 volt, 3200 amp. Electrically operated, draw-out, 120 VAC, Amptector I A Model with LSI functions ** Broken Secondary Disconnect** Used electrically OK.
SKU: DS-632-#22982
$6,500.00
View product Add to cart
Picture of DS840 SQ-D 4000A 600V EO/DO Air Breaker LSI

DS840 SQ-D 4000A 600V EO/DO Air Breaker LSI

Square D DS-840 low voltage AC power circuit breaker; 4000 amp, 600 volt. Electrically operated, draw-out, Amptector II with LSI functions. Used electrically OK.
SKU: DS840 #20256
$9,500.00
View product Add to cart
Picture of DS-840 Square D 4000A Frame 4000A Rating Plug/Sensors EO/DO Air Breaker LS

DS-840 Square D 4000A Frame 4000A Rating Plug/Sensors EO/DO Air Breaker LS

Square D DS-840 low voltage AC power circuit breaker; 4000 amp frame, 4000 amp sensors. Electrically operated, draw-out, 120 volt AC spring release, 120 volt AC motor circuit, 120 volt AC shunt trip, Digitrip RMS 510 S53LS (A) with LS functions. 4000 amp rating plug RP6D40A400. Used electrically OK.
SKU: DS840 EMSCO #20496
$9,500.00
View product Add to cart
Picture of DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

Square D DS-840 low-voltage AC power circuit breaker; 4000 amp frame, 4000 amp rating plug, 600 volt, RP6D40A400. Electrically operated, draw-out, 120 volt AC shunt trip, 120 volt AC spring release, 120 volt AC close circuit, Digitrip RMS 510 cat# S53LS (A) with LS functions. Used electrically OK.
SKU: DS840 EMSCO #20651
$9,500.00
View product Add to cart
Picture of DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

Square D DS-840 low voltage AC power circuit breaker; 4000 amp frame, 4000 amp sensors. Electrically operated, draw-out, Digitrip RMS 510 cat# S53LS (A) with LS functions. Used electrically OK.
SKU: DS840 EMSCO #20653
$9,500.00
View product Add to cart
Picture of DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

Square D DS-840 low-voltage AC power circuit breaker; 4000 amp frame, 4000 amp rating plug cat # RP6D40A400. Electrically operated, draw-out, 120 volt AC shunt trip, 120 volt AC spring release, 120 volt AC close circuit, Digitrip RMS 510 cat# S53LS (A) with LS functions. Used electrically OK.
SKU: DS840 EMSCO #20656
$9,500.00
View product Add to cart
Picture of DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

DS-840 Square D 4000A Frame 4000A Sensors EO/DO Air Breaker LS

Square D DS-840 low-voltage AC power circuit breaker; 4000 amp frame, 4000 amp rating plug cat# RP6D40A400. Electrically operated, draw-out, 120 volt AC shunt trip, 120 volt AC spring release, 120 volt AC close circuit, Digitrip RMS 510 cat# S53LS (A) with LS functions. Used electrically OK.
SKU: DS840 EMSCO #20659
$9,500.00
View product Add to cart
Picture of DS-840 Square D 4000A Frame 4000A Sensors LSI EO/DO Air Breaker

DS-840 Square D 4000A Frame 4000A Sensors LSI EO/DO Air Breaker

Square D DS-840 low-voltage AC power circuit breaker; 4000 amp frame, 4000 amp sensors, 600 volt. Electrically operated, draw-out, 120 volt AC shunt trip, 120 volt AC close circuit, Amptector II-A Model TR with LSI functions. Used electrically OK.
SKU: DS840 EMSCO #20673
$9,500.00
View product Add to cart
Picture of DS-840 Square D Air Breaker 600V 4000A EO/DO LS

DS-840 Square D Air Breaker 600V 4000A EO/DO LS

Square D DS-840 low voltage AC power circuit breaker; 600 volt, 4000 amp. Electrically operated, draw-out, 120 VAC, Digitrip RMS 510 with LS functions. Used electrically OK.
SKU: DS-840-#22957
$9,500.00
View product Add to cart
Picture of DS-840 Square D Air Breaker 600V 4000A EO/DO LS

DS-840 Square D Air Breaker 600V 4000A EO/DO LS

Square D DS-840 low voltage AC power circuit breaker; 600 volt, 4000 amp. Electrically operated, draw-out, 120 VAC, Digitrip RMS 510 with LS functions. Used electrically OK.
SKU: DS-840-#22958
$9,500.00
View product Add to cart
Picture of DS-840 Square D Air Breaker 600V 4000A EO/DO LS

DS-840 Square D Air Breaker 600V 4000A EO/DO LS

Square D DS-840 low voltage AC power circuit breaker; 600 volt, 4000 amp. Electrically operated, draw-out, 120 VAC, Digitrip RMS 510 with LS functions. Used electrically OK.
SKU: DS-840-#22960
$9,500.00
View product Add to cart
Picture of DS-840 Square D Air Breaker 600V 4000A EO/DO LS

DS-840 Square D Air Breaker 600V 4000A EO/DO LS

Square D DS-840 low voltage AC power circuit breaker; 600 volt, 4000 amp. Electrically operated, draw-out, 120 VAC, Digitrip RMS 510 with LS functions. Used electrically OK.
SKU: DS-840-#22961
$9,500.00
View product Add to cart
Picture of DS-840 Square D Air Breaker 600V 4000A EO/DO LS

DS-840 Square D Air Breaker 600V 4000A EO/DO LS

Square D DS-840 low voltage AC power circuit breaker; 600 volt, 4000 amp. Electrically operated, draw-out, 120 VAC, Digitrip RMS 510 with LS functions. Used electrically OK.
SKU: DS-840-#22962
$9,500.00
View product Add to cart
Picture of DS-840 Square D Air Breaker 600V 4000A EO/DO LSI

DS-840 Square D Air Breaker 600V 4000A EO/DO LSI

Square D DS-840 low voltage AC power circuit breaker; 600 volt, 4000 amp. Electrically operated, draw-out, 115 AC, Amptector I A Model with LSI functions. Used electrically OK.
SKU: DS-840-#22963
$9,500.00
View product Add to cart
Picture of DS-840 Square D Air Breaker 600V 4000A EO/DO LSI

DS-840 Square D Air Breaker 600V 4000A EO/DO LSI

Square D DS-840 low voltage AC power circuit breaker; 600 volt, 4000 amp. Electrically operated, draw-out, 115 AC, Amptector I A Model with LSI functions** Broken Secondary Disconnect** Used electrically OK.
SKU: DS-840-#22972
$8,500.00
View product Add to cart

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.