Molded & Insulated Case 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.

HR3-F200 ITE Circuit Breaker 2000 Amp 600 VAC M/O F/M

ITE HR3-F200 circuit breaker; 2000 amp, 600 volt AC, 3 pole. With 2000 amp trip, shunt trip cat# S01HPORO, manually operated (M/O), fixed mount (F/M), mounting plate, used tested with report.
SKU: MCCB1675
$3,900.00

ITE HR3-B200 Circuit Breaker 2000 Amp 600 VAC W/Plate

ITE HR3-B200 Circuit Breaker; 2000 amp, 3 pole, 600 volt AC, with plate, used tested with report.
SKU: MCCB1865
Contact us for pricing:

KCL34125 Square D Circuit Breaker

Square D KCL34125 circuit breaker; 125 amp, 480 volt, three pole, line & load side lugs. Used tested with report.
SKU: KCL34125
$1,200.00

KCL34150 Square D Circuit Breaker

Square D KCL34150 circuit breaker; 150 amp, 480 volt, three pole, line & load side lugs. Used tested with report.
SKU: KCL34150
$1,200.00

KCL34175 Square D Circuit Breaker

Square D KCL34175 circuit breaker; 175 amp, 480 volt, three pole, line & load side lugs. Used tested with report.
SKU: KCL34175
$1,200.00

KCL34200 Square D Circuit Breaker

Square D KCL34200 circuit breaker; 200 amp, 480 volt, three pole, line & load side lugs. Used tested with report.
SKU: KCL34200
$1,200.00

KCL34225 Square D Circuit Breaker

Square D KCL34225 circuit breaker; 225 amp, 480 volt, three pole, line & load side lugs. Used tested with report.
SKU: KCL34225
$1,200.00

KCL34250 Square D Circuit Breaker

Square D KCL34250 circuit breaker; 250 amp, 480 volt, three pole, line & load side lugs. Used tested with report.
SKU: KCL34250
$1,200.00

WLF2A320 Siemens 2000A Frame 2000A Rated 600V Fused Power Circuit Breaker M/O D/O

Siemens low voltage AC integrally fused WLF2A320 power circuit breaker: 2000 amp frame, 600 volt, 2000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O), open fuse, lock-out WLOFLO, 3000 amp fuses - (A4BY3000-SEA-3) in cell - WLFG2320, used tested with report.
SKU: AB201420523
$7,200.00

WLF2A320 Siemens 2000A Frame 2000A Rated 600V Fused Power Circuit Breaker M/O D/O

Siemens low voltage AC integrally fused WLF2A320 power circuit breaker: 2000 amp frame, 600 volt, 2000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O), open fuse lock-out, WLOFLO 3000 amp fuses - (A4BY3000-SEA-3) in cell - WLFG2320, used tested with report.
SKU: AB201420524
$7,200.00

WLF2A320 Siemens 2000A Frame 2000A Rated 600V Fused Power Circuit Breaker M/O D/O

Siemens low voltage AC integrally fused WLF2A320 power circuit breaker: 2000 amp frame, 600 volt, 2000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O), open fuse lock-out, WLOFLO 3000 amp fuses - (A4BY3000-SEA-3) in cell - WLFG2320, used tested with report.
SKU: AB201420525
$7,200.00

WLF2A320 Siemens 2000A Frame 2000A Rated 600V Fused Power Circuit Breaker M/O D/O

Siemens low voltage AC integrally fused WLF2A320 power circuit breaker: 2000 amp frame, 600 volt, 2000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O), open fuse lock-out, WLOFLO 3000 amp fuses - (A4BY3000-SEA-3) in cell - WLFG2320, used tested with report.
SKU: AB201420526
$7,200.00

WLF2A320 Siemens 2000A Frame 2000A Rated 600V Fused Power Circuit Breaker M/O D/O

Siemens low voltage AC integrally fused WLF2A320 power circuit breaker: 2000 amp frame, 600 volt, 2000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O), open fuse lock-out, WLOFLO 3000 amp fuses - (A4BY3000-SEA-3) in-cell - WLFG2320, used tested with report.
SKU: AB201421215
$7,200.00

WLF2A320 Siemens 2000A Frame 2000A Rated 600V Fused Power Circuit Breaker M/O D/O

Siemens low voltage AC integrally fused WLF2A320 power circuit breaker; 2000 amp frame, 600 volt, 2000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O), open fuse, lock-out, WLOFLO 3000 amp fuses - (A4BY3000-SEA-3) in-cell - WLFG2320, used tested with report.
SKU: AB201421216
$7,200.00

WLF2A320 Siemens 2000A Frame 600V Fused Power CB M/O D/O in Cell

Siemens low voltage AC integrally fused WLF2A320 power circuit breaker; 2000 amp frame, 600 volt, 2000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O), open fuse lock-out WLOFLO, 3000 amp fuses - (A4BY3000-SEA-3) in-cell - WLFG2320, used tested with report.
SKU: AB201421217
$7,200.00

WLF3A340 Siemens 4000A Frame 4000A Rated 600V Power Circuit Breaker M/O D/O

Siemens low voltage AC integrally fused WLF3A340 power circuit breaker: 4000 amp frame, 600 volt, 4000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O) in cell - WLFG2340, used tested with report.
SKU: AB201421211
$15,000.00

WLF3A340 Siemens 4000A Frame 4000A Rated 600V Power Circuit Breaker M/O D/O

Siemens low voltage AC Integrally fused WLF3A340 power circuit breaker; 4000 amp frame, 600 volt, 4000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O) In cell - WLFG2340, used tested with report.
SKU: AB201421212
$15,000.00

WLF3A340 Siemens 4000A Frame 4000A Rated 600V Power Circuit Breaker M/O D/O

Siemens low voltage AC Integrally fused WLF3A340 power circuit breaker: 4000 amp frame, 600 volt, 4000 amp rating plug. Integrated cubicle bus trip unit ETU745, LSIG functions, manually operated (M/O), draw out (D/O) in cell - WLFG2340, used tested with report.
SKU: AB201421213
$15,000.00

WLFCAR50 Siemens Fuse Truck for WLF3A3xx or WLF353xx 5000A Frame Size 600V

Siemens WLFCAR50 low voltage AC fuse draw-out: 5000 amp frame, size 600 volt for use with WLF3A3xx circuit breaker or WLF353xx non-autom. Switch fuse replacement kit: WLCLFUSE2003 draw out 6000 amp fuses - (A4BY6000-SEA-1) in cell - WLGF3340 (FB), used tested with report.
SKU: AB201420527
$9,000.00

WLFCAR50 Siemens Fuse Truck for WLF3A3xx or WLF353xx 5000A Frame Size 600V in Cell

Siemens WLFCAR50 low voltage AC fuse, draw-out; 5000 amp frame size, 600 volt for use with WLF3A3xx circuit breaker or WLF353xx non-autom. Switch fuse replacement kit: WLCLFUSE2003, draw-out, 6000 amp fuses - (A4BY6000-SEA-1) in cell - WLGF3340 (FB), used electrically OK.
SKU: AB201421210
$9,000.00

New, Used, and Tested Molded & Insulated Case Circuit Breakers

EMSCO has been specializing in used and refurbished molded & insulated case circuit breakers for over 72 years.


Why Choose EMSCO for Molded Case or Insulated Case Circuit Breakers?

Want to match and replace your existing breakers? End the hassle of retrofitting your electrical system. Our extensive inventory includes a variety of Molded Case Circuit Breakers (MCCBs) and Insulated Case Circuit Breakers that are designed to seamlessly match and replace your existing breakers by brand, amp rating, voltage, frame size, or model.

New and Refurbished Products in Stock

We understand that budgets and preferences differ, so we give you the option of selecting between new and refurbished MCCBs or Insulated Case Breakers, both of which are readily available in our inventory. Choose brand-new circuit breakers for maximum performance and longevity, or look into our refurbished options, which have been rigorously tested and reconditioned to meet industry standards.

Popular Brands and Common Configurations

Our shelves are stocked with breakers from the most trusted and popular brands in the industry, ensuring you have access to dependable products. You'll find common configurations, such as different frame sizes and voltage ratings, making it simple to find the right circuit protection for your application.

Avoiding Costly Operational Downtime

Downtime can be an expensive situation. Our circuit protection products are designed for high performance and durability. You can avoid costly operational downtime due to electrical failures by using our fully-tested Molded Case or Insulated Case breakers. Our products provide reliable power and superior equipment protection.

Electrical Testing Equipment Certifying Quality and Performance

When it comes to the dependability and safety of your electrical systems, we leave nothing to chance. Our breakers are rigorously tested using current testing equipment to ensure that they meet or exceed industry standards. This ensures that your electrical installations are safe and efficient.

  • Overcurrent Protection: We verify that your breakers provide accurate overcurrent protection, guaranteeing the safety of your electrical systems.
  • Trip Time: We measure the time it takes for breakers to respond to overcurrent conditions, ensuring it operates within the specified trip time.
  • Short-Circuit Withstand Capacity: Our testing evaluates the breaker’s ability to withstand short-circuit currents, preventing damage and maintaining safety.
  • Interrupting Capacity: We determine the MCCB's capability to interrupt fault currents, ensuring the utmost protection for your electrical system.

Molded Case Circuit Breaker Specifications

A sample table of ampere ratings, corresponding voltage ratings, and frame sizes for molded case circuit breakers is shown below. Please keep in mind that frame sizes and ratings can differ between manufacturers and models. For precise details on a specific MCCB, always refer to the manufacturer's specifications.

Frame Size

Ampere Rating

Voltage Rating

A

15A

120V, 240V

A

20A

120V, 240V

B

30A

120V, 240V, 480V

B50A120V, 240V, 480V
C60A240V, 480V
C100A240V, 480V
D150A240V, 480V, 600V
D200A240V, 480V, 600V
E250A240V, 480V, 600V
E300A240V, 480V, 600V
F400A240V, 480V, 600V
F600A240V, 480V, 600V
G800A240V, 480V, 600V
G1200A240V, 480V, 600V
H1600A240V, 480V, 600V

This table is a sample representation of frame sizes, ampere ratings, and voltage ratings for Molded Case Circuit Breakers, not an exhaustive list.

Molded case circuit breakers (MCCBs) and insulated case circuit breakers (ICCBs) are two distinct types of circuit protection devices used in electrical systems. Both serve the purpose of interrupting electrical currents in case of faults or overloads, but they differ in construction, application, and performance characteristics. Need Help Now? Call 800-328-1842.