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.

Eaton RGH65K Circuit Breaker RGH316038E 1600 Amp 600 Volt AC F/M M/O

Eaton RGH65K Circuit Breaker; cat# RGH3156038E, 1600 amp, 600 volt AC, 3 pole. With RT316038 trip unit, LSI functions, fixed-mount (F/M), manually operated (M/O). Used tested with report.
SKU: MCCB2048
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EDC3100 Cutler-Hammer Circuit Breaker

Cutler-Hammer EDC3100 circuit breaker; 100 amp, 240 volt, three pole, 200 kAIC @ 240 volt AC, load side lugs. Used electrically OK.
SKU: EDC3100
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EDC3125 Cutler-Hammer Circuit Breaker

Cutler-Hammer EDC3125 circuit breaker; 125 amp, 240 volt, three pole, 200 kAIC @ 240 volt AC, load side lugs. Used electronically OK.
SKU: EDC3125
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EDC3150 Cutler-Hammer Circuit Breaker

Cutler-Hammer EDC3150 circuit breaker; 150 amp, 240 volt, three pole, 200 kAIC @ 240 volt AC, load side lugs. Used electronically OK.
SKU: EDC3150
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EDC3175 Cutler-Hammer Circuit Breaker

Cutler-Hammer EDC3175 circuit breaker; 175 amp, 240 volt, three pole, 200 kAIC @ 240 volt AC, load side lugs. Used electronically OK.
SKU: EDC3175
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EDC3200 Cutler-Hammer Circuit Breaker

Cutler-Hammer EDC3200 circuit breaker; 200 amp, 240 volt, three pole, 200 kAIC @ 240 volt AC, load side lugs. Used electronically OK.
SKU: EDC3200
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EDC3225 Cutler-Hammer Circuit Breaker

Cutler-Hammer EDC3225 circuit breaker; 225 amp, 240 volt, three pole, 200 kAIC @ 240 volt AC, load side lugs. Used electronically OK.
SKU: EDC3225
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NT08L1 Square D MasterPact Circuit Breaker W/ Micrologic 5.0P & 600 Amp Rating

Square D NT08L1 MasterPact circuit breaker; catalog # TL8ATR63A3SXFXXXXA 800 amp frame, 600 amp rated Micro logic 5.0P trip unit with LSI functions Modbus 65 KAIC @ 480 VAC, manually operated draw-out, used tested with report.
SKU: NT08L1
$3,000.00

SED361600LS Square D Breaker 1600 Amp 600 VAC

Square D SED361600LS breaker; 1600 amp, 600 volt AC, 3 pole. With 1600 amp rating plug cat.# ARP100, micro logic full function series B trip unit, used tested with report.
SKU: MCCB1360
$5,400.00

SED362000LSGES5D8 Square D Breaker 2000 Amp 600 VAC LSIG ARP100 Rating Plug M/O D/O

Square D SED362000LSGES5D8 Breaker; 2000 amp, 600 VAC, three pole. Micrologic full function series "B" trip unit with LSIG functions, ARP100 rating plug. Manually operated (M/O), draw-out (D/O), with cubicle, with accessories. Used tested with report.
SKU: MCCB1838
$15,500.00

SED363000LSES504 Square D Breaker 3000 Amp 600 VAC E/O D/O

Square D SED363000LSES504 breaker; series 3A, 3000 amp with 3000 amp rating plug cat.#RP100 with shunt trip 24 VDC, shunt close, 120 VAC, 50/60 HZ with alarm switches, 120/240 VAC, 50/60 HZ with 4 auxiliary switches 125 VDC, 120 VAC, 50/60 HZ, 600 VAC, electrically operated (E/O), spring charging motor, 120 VAC, 50/60 HZ spring charge contact 125-250 VAC, 50/60 HZ, draw-out (D/O), used tested with report.
SKU: MCCB1272
$8,100.00

SED363000LSGES5D4 Square D Breaker 3000 Amp 600 VAC E/O

Square D SED363000LSGES5D4 breaker; series 3, 3000 amp, 600 volt AC, 3 pole. With 3000 amp rating plug cat.#ARP100, micro logic with LSIG functions, ground fault, shunt trip- 24 VDC, with 4 auxiliary switches- 125 VDC/ 120 VAC, 50/60 HZ, integral ground fault- 120 VAC, alarm switch- 120/240 VAC, electrically operated (E/O), used tested with report.
SKU: MCCB1359
$11,700.00

SED364000LSGS1A8 Square D Breaker 4000 Amp 600 VAC

Square D SED364000LSGS1A8 breaker; 4000 amp with 3000 amp rating plug cat.#ARP075, shunt trip, micro logic full function series B with LSIG, ground fault, 600 VAC, used tested with report.
SKU: MCCB1377
$18,000.00

Square D MasterPact NT 08 L1 Breaker 800 Amp 600 VAC LSIG M/O D/O

Square D NT 08 L1 MasterPact Circuit Breaker; Cat# TLBASR44A35XXXXXXX, 800 amp, 600 volt AC, three pole. With Micrologic 6.0A, LSIG functions, ground fault, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1870
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Square D MasterPact NT08LI Circuit Breaker 800 Amp 600 Volt AC M/O D/O

Square D MasterPact NT08LI Circuit Breaker; cat# TL8AAR44A3SXFXXXXA, 800 amp, 600 volt AC, 3 pole. With micrologic 6.0 A trip unit, LSIG functions, ground fault, manually operated (M/O), draw-out (D/O). Used tested with report.
SKU: MCCB2104
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Square D NT08L1 MasterPact Breaker 800A 600 VAC D/O M/O

Square D NT08L1 MasterPact Breaker; cat# TL8ASR44A3SXXXXXXA, 800 amp, 600 volt AC, 3 pole. With micrologic 6.0A trip unit, LSIG functions, ground fault, draw-out (D/O), manually operated (M/O), used tested with report.
SKU: MCCB1992
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Square D NT08L1 MasterPact Breaker 800A 600 VAC D/O M/O

Square D NT08L1 MasterPact Breaker; cat# TL8ASR44A3SXXXXXXA, 800 amp, 600 volt AC, 3 pole. With micrologic 6.0A trip unit, LSIG functions, ground fault, draw-out (D/O), manually operated (M/O), used tested with report.
SKU: MCCB1993
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Square D NT08L1 MasterPact Breaker 800A 600 VAC D/O M/O

Square D NT08L1 MasterPact Breaker; cat# TL8ASR44A3SXXXXXXA, 800 amp, 600 volt AC, 3 pole. With micrologic 6.0A trip unit, LSIG functions, ground fault, draw-out (D/O), manually operated (M/O), used tested with report.
SKU: MCCB1994
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Square D NT08L1 MasterPact Breaker 800A 600 VAC D/O M/O

Square D NT08L1 MasterPact Breaker; cat# TL8ASR44A3SXXXXXXA, 800 amp, 600 volt AC, 3 pole. With micrologic 6.0A trip unit, LSIG functions, ground fault, draw-out (D/O), manually operated (M/O). Used tested with report.
SKU: MCCB1995
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Square D SED363000LSA4 Circuit Breaker 3000A 600 VAC M/O D/O

Square D SED363000LSA4 Circuit Breaker; 3000 amp, 600 volt AC, 3 pole. With micrologic standard series B, LSI functions, ARP100 rating plug, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1989
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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.