Molded & Insulated Case Circuit Breakers

Please note that our available online inventory is only a sampling of our available in-stock inventory. If you cannot locate the product you need, please call us at 1-800-328-1842. Our sales team will be happy to find it for you.

SEDA36AT0100 General Electric Circuit Breaker

General Electric SEDA36AT0100 Spectra circuit breaker; 100 amp, 600 volt, three pole, rating plug included, used tested with report.
SKU: SEDA36AT0100

THJK436125 General Electric Circuit Breaker

General Electric THJK436125 circuit breaker; 125 amp, 600 volt, three pole, line & load side lugs. Used tested with report.
SKU: THJK436125

Westinghouse HLC3600F Circuit Breaker

Westinghouse HLC3600F circuit breaker; 600 amp frame, 600 volt, three pole, used tested with report.
SKU: HLC3600F

FDB3050 Cutler-Hammer Circuit Breaker

Cutler-Hammer FDB3050 circuit breaker; 50 amp, 600 volt, three pole, 14 kAIC @ 600 volt AC, used tested with report.
SKU: FDB3050

TKM836600 General Electric Circuit Breaker

General Electric TKM836600 circuit breaker; 600 amp, 600 volt, three pole, used tested with report.
SKU: TKM836600

TPSS6612DGBA3 GE Power Break Breaker 1200 Amp 600 VAC

General Electric TPSS6612DGBA3 Power Break Circuit Breaker; 1200 amp, 600 volt AC, 3 pole. With solid state VersaTrip. SN.# V26259A, LSG functions, ground fault, manually operated (M/O), draw-out (D/O), carriage assembly, used tested with report.
SKU: MCCB1094

ED43B025 ITE & Siemens Circuit Breaker

ITE & Siemens ED43B025 circuit breaker: 25 amp, 480 volt, three pole, load side lugs. Used tested with report.
SKU: ED43B025

FA32080 Square D I-Line Circuit Breaker

Square D FA32080 I-Line circuit breaker; 80 amp, 240 volt, three pole, used electronically OK.
SKU: FA32080

TEY360 General Electric Circuit Breaker

General Electric TEY360 circuit breaker; 60 amp, 480Y/277 volt, three pole, used tested with report.
SKU: TEY360

TJJ436200 General Electric Circuit Breaker

General Electric TJJ436200 circuit breaker: 200 amp, 600 volt, three pole, line & load side lugs. Used tested with report.
SKU: TJJ436200

GHB3015 Cutler-Hammer Circuit Breaker

Cutler-Hammer GHB3015 circuit breaker: 15 amp, 480 volt, three pole, load side lug. Used tested with report.
SKU: GHB3015

EF3-B020 ITE Circuit Breaker

ITE EF3-B020 circuit breaker; 20 amp, 600 volt, three pole, load side lugs. Used tested with report.
SKU: EF3-B020

TKM863F000 General Electric Circuit Breaker

General Electric TKM863F000 circuit breaker: 800-1200 amp, 600 volt, three pole, used tested with report.
SKU: TKM863F000

TKM836700 General Electric Circuit Breaker

General Electric TKM836700 circuit breaker: 700 amp, 600 volt, three pole, used tested with report.
SKU: TKM836700

TKMA836500 General Electric Circuit Breaker

General Electric TKMA836500 circuit breaker: 500 amp, 600 volt, three pole, used tested with report.
SKU: TKMA836500

TJJ436225 General Electric Circuit Breaker

General Electric TJJ436225 circuit breaker: 225 amp, 600 volt, three pole, line & load side lugs. Used tested with report.
SKU: TJJ436225

TJJ436250 General Electric Circuit Breaker

General Electric TJJ436250 circuit breaker: 250 amp, 600 volt, three pole, line & load side lugs. Used tested with report.
SKU: TJJ436250

TJJ436300 General Electric Circuit Breaker

General Electric TJJ436300 circuit breaker: 300 amp, 600 volt, three pole, line & load side lugs. Used tested with report.
SKU: TJJ436300

TJJ436400 General Electric Circuit Breaker

General Electric TJJ436400 circuit breaker: 400 amp, 600 volt, three pole, line & load side lugs. Used tested with report.
SKU: TJJ436400

SPB100 Cutler-Hammer/Westinghouse Breaker 800 Amp 600 VAC M/O D/O

Cutler-Hammer/Westinghouse SPB 100 circuit breaker; cat.# SPBR38C, 800 amp, 600 amp. With rating plug cat.# RP6S08A060, Digitrip RMS910 cat.#S95LSG (D), LSG functions, ground fault, auxiliary switch cat.# SPBAUXC164, power relay module cat.# SPBAATR, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1558

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

B

50A

120V, 240V, 480V

C

60A

240V, 480V

C

100A

240V, 480V

D

150A

240V, 480V, 600V

D

200A

240V, 480V, 600V

E

250A

240V, 480V, 600V

E

300A

240V, 480V, 600V

F

400A

240V, 480V, 600V

F

600A

240V, 480V, 600V

G

800A

240V, 480V, 600V

G

1200A

240V, 480V, 600V

H

1600A

240V, 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.