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Molded & Insulated Case Circuit Breakers

Home > Store > Circuit Breakers > Molded & Insulated Case Circuit Breakers

Manufacturer
Amperage
Condition
Family
Fixed Mount or Draw Out
Frame
Functions
Ground Fault
Indoor/Outdoor
Main Type
Operation
Phase
Poles
Series
Shunt Trip
Style
Voltage
Wire
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 CQD390 ITE & Siemens Circuit Breaker

CQD390 ITE & Siemens Circuit Breaker

ITE & Siemens CQD390 circuit breaker; 90 amp, 277 volt, three pole, load side lugs. Used electrically OK.
SKU: CQD390
$200.00
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Picture of Cutler-Hammer Magnum DS MDS620 Circuit Breaker 2000 Amp 600 Volt AC M/O D/O

Cutler-Hammer Magnum DS MDS620 Circuit Breaker 2000 Amp 600 Volt AC M/O D/O

Cutler-Hammer Magnum DS MDS620 Circuit Breaker; cat # MDS6203WEA 205GC NAN2Y NNNAX, 2000 amp, 600 volt AC, 3 pole, manually operated (M/O), fixed-mount (F/M). With digitrip 520 with LSIG functions, ground fault, 2000 amp rating plug. Used tested with report.
SKU: MCCB2154
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Picture of Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Cutler-Hammer/ Eaton MDSC16 Magnum DS low voltage AC power circuit breaker; cat# MDSC163WEA12MHA, 1600 amp, 600 volt AC, 3 pole. With 1600 amp rating plug, Digitrip 520M cat.#5MLSIG, LSIG functions, ground fault, shunt trip- 110/127 VAC, 110/125 VDC, auxiliary switches, manually operated (M/O), draw-out (D/O), draw-out carriage cat.# MN203PADNNNNNNC, used tested with report.
SKU: MCCB1440
$5,500.00
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Picture of Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Cutler-Hammer/Eaton MDSC16 Magnum DS low voltage AC power circuit breaker; cat # MDSC163WEA12MHA, 1600 amp, 600 volt AC, 3 pole. With Digitrip 520M cat.# 5MLSIG, LSIG functions, ground fault, 1600 amp rating plug, shunt trip- 110/127 VAC, 110/125 VDC, manually operated (M/O), draw-out (D/O), draw-out carriage cat.# MN203PADNNNNNNC, used tested with report.
SKU: MCCB1454
$5,500.00
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Picture of Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Cutler-Hammer/ Eaton MDSC16 Magnum DS low voltage AC power circuit breaker; cat# MDSC163WEA 12MHA MNN4N NNNAX, 1600 amp, 600 volt AC, three pole. With Digitrip 520M cat# 5MLSIG (E), LSIG functions, ground fault, 1600 amp rating plug, trip unit power- 24-48 VDC, auxiliary switches- 4A/ 4B, manually operated (M/O), draw-out (D/O). Used tested with report.
SKU: MCCB1893
$4,500.00
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Picture of Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600A Frame 635V E/O D/O

Cutler-Hammer Magnum DS MDSC16 Circuit Breaker 1600A Frame 635V E/O D/O

Cutler-Hammer MDSC16 Magnum DS low voltage AC power circuit breaker; cat # MDSC163WEA 16MEC NAN4Y CNNAX, 1600 amp frame, 635 volt, 3 pole. With Digitrip 520M trip unit cat# 5MLSIA, LSI functions, 1600 amp rating plug, motor operator- 110/125 VAC, trip unit power- 24 VDC, auxiliary switches, test report, electrically operated (E/O), draw-out (D/O). Used tested with report.
SKU: MCCB1887
$4,500.00
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Picture of Cutler-Hammer MDS4083 Magnum DS 800 Amp 600 VAC Molded Case Switch D/O

Cutler-Hammer MDS4083 Magnum DS 800 Amp 600 VAC Molded Case Switch D/O

Cutler-Hammer MDS4083 Magnum DS low voltage AC power circuit breaker; cat # MDS408WEA NNNNA WAN6E PNNAX, 800 amp, 600 volt AC, 3 pole. With draw-out (D/O), motor operator- 110-125 VAC/DC- 50/60 HZ, auxiliary switch- 6A/6B. Used tested with report.
SKU: MCCB1461
$1,200.00
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Picture of Cutler-Hammer MDSC16 Magnum DS Circuit Breaker 1600 Amp 600 VAC M/O D/O Tested

Cutler-Hammer MDSC16 Magnum DS Circuit Breaker 1600 Amp 600 VAC M/O D/O Tested

Cutler-Hammer/ Eaton MDSC16 Magnum DS low voltage AC power circuit breaker: cat.#MDSC163WEA12MHA, 1600 amp, 600 volt AC. With 1600 amp rating plug. Digitrip 520M cat.#5MLSIG with LSIG functions, shunt trip- 110/127 VAC, 110/125 VDC, auxiliary switches. Manually operated (M/O), draw-out (D/O), draw-out carriage cat.# MN203PADNNNNNNC, used tested with report.
SKU: MCCB1439
$7,500.00
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Picture of Cutler-Hammer Pow-R-Line MLO Switchboard 3000 Amp 480Y/277 Volt 3 Ph 4 W NEMA 1 R&G

Cutler-Hammer Pow-R-Line MLO Switchboard 3000 Amp 480Y/277 Volt 3 Ph 4 W NEMA 1 R&G

Cutler-Hammer Pow-R-Line Main Lug Only Switchboard; 3000 amp, 480Y/277 volt, 3 phase, 4 wire, NEMA 1 indoor rated. With 2 sections of C-series breaker distribution. Reconditioned & guaranteed with a one-year warranty.
SKU: M658
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Picture of Cutler-Hammer RD316T56W Breaker 1600A 600VAC M/O F/M

Cutler-Hammer RD316T56W Breaker 1600A 600VAC M/O F/M

Cutler-Hammer RD65K Breaker; cat# RD316T56W, 1600 amp, 600 volt AC, 3 pole. With digitrip RMS 510 trip unit cat# S56LSIG (B), LSIG functions, ground fault, with 1600 amp rating plug cat# RP6R16A160, handle lock, manually operated (M/O), fixed-mount (F/M), & test report. Used tested with report.
SKU: MCCB1969
$5,500.00
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Picture of Cutler-Hammer RD65K Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Cutler-Hammer RD65K Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Cutler-Hammer RD65K Circuit Breaker; cat# RD320T32W, 2000 amp, 600 volt AC, 3 pole. With digitrip RMS310 trip unit cat# RES2000LSI, LSI functions, 2000 amp rating plug cat# 20RES20T, manually operated (M/O), fixed-mount (F/M). Used tested with report.
SKU: MCCB2076
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Picture of Cutler-Hammer RD65K Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Cutler-Hammer RD65K Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Cutler-Hammer RD65K Circuit Breaker; cat # RD320T35W, 2000 amp, 600 volt AC, 3 pole, manually operated (M/O), fixed-mount (F/M). With digitrip RMS 310 trip unit- cat # RES2000LSG, ground fault, 2000 amp rating plug. Used tested with report.
SKU: MCCB2203
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Picture of Cutler-Hammer RDC316T33W Circuit Breaker 1600A 600VAC M/O F/M

Cutler-Hammer RDC316T33W Circuit Breaker 1600A 600VAC M/O F/M

Cutler-Hammer RDC100K Breaker: Cat # RDC316T33W, 1600 amps, 600 VAC. With digitrip RMS310 cat # RES1600LS, 1600 amp rating plug cat # 16RES16T, manually operated, fixed mount. Used tested with report.
SKU: MCCB1975
$6,500.00
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Picture of Cutler-Hammer/ Westinghouse RD65K Circuit Breaker RD316T56W 1600 Amp 600 Volt AC M/O F/M

Cutler-Hammer/ Westinghouse RD65K Circuit Breaker RD316T56W 1600 Amp 600 Volt AC M/O F/M

Cutler-Hammer/ Westinghouse RD65K Circuit Breaker; cat# RD316T56W, 1600 amp, 600 volt AC, 3 pole. With Digitrip RMS510 trip unit cat# S56LSIG (B), LSIG functions, ground fault, 1600 amp rating plug cat# RP6R16A160, handle lock cat# HLK6, manually operated (M/O), fixed-mount (F/M). Used tested with report.
SKU: MCCB2047
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Picture of Eaton RDC316T107W Circuit Breaker 1600A 600 VAC M/O F/M

Eaton RDC316T107W Circuit Breaker 1600A 600 VAC M/O F/M

Eaton RDC100K Circuit Breaker: Cat # RDC316T107W, 1600 amp, 600 Volt AC, manually operated/ fixed mount. With digitrip optim 1050 programmable trip unit cat # P107LSIA. With 1600 amp rating plug cat # ORPR16A160. Used tested with report.
SKU: MCCB1974
$6,500.00
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Picture of Eaton Magnum SB SBSC16 Circuit Breaker 1600 Amp 600 Volt AC M/O F/M

Eaton Magnum SB SBSC16 Circuit Breaker 1600 Amp 600 Volt AC M/O F/M

Eaton Magnum SB SBSC16 Circuit Breaker; Cat # SBSC163HEA 16MCN MNNNE NNNFX, 1600 amp, 600 volt AC, 3 pole, manually operated (M/O), fixed-mount (F/M). With Digitrip 520M trip unit- cat # 5MLSIA, LSIG functions, ground fault, 1600 amp rating plug. Used tested with report.
SKU: MCCB2249
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Picture of Eaton MDSX20 Magnum DSX Circuit Breaker 2000 Amp 600 VAC E/O D/O

Eaton MDSX20 Magnum DSX Circuit Breaker 2000 Amp 600 VAC E/O D/O

Eaton MDSX20 Magnum DSX low voltage AC power circuit breaker; cat# MDSX203WEA 201XA WAN4Y NANAX, 2000 amp, 600 Volt AC, 3 pole. With Digitrip 1150+ cat# 11ARMLSIG, LSIG functions, ground fault, auxiliary switches, test report, electrically operated (E/O)- 110-125 VAC/DC, draw-out (D/O), used tested with report.
SKU: MCCB1925
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Picture of Eaton MDSX20 Magnum DSX Circuit Breaker 2000 Amp 600 VAC E/O D/O

Eaton MDSX20 Magnum DSX Circuit Breaker 2000 Amp 600 VAC E/O D/O

Eaton MDSX20 Magnum DSX low voltage AC power circuit breaker; cat# MDSX203WEA 201XA WAN4Y NANAX, 2000 amp, 600 volt AC, three pole. With Digitrip 1150+ cat# 11ARMLSIG, LSIG functions, ground fault, auxiliary switches, electrically operated (E/O)- 110-125 VAC/DC, draw-out (D/O), used tested with report.
SKU: MCCB1926
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Picture of Eaton PB-DC Circuit Breaker PBDC32000W Circuit Breaker 2000 Amp 600 Volt DC M/O F/M

Eaton PB-DC Circuit Breaker PBDC32000W Circuit Breaker 2000 Amp 600 Volt DC M/O F/M

Eaton PB-DC Circuit Breaker; Cat # PBDC32000W, 2000 amp, 600 volt DC, 3 pole, manually operated (M/O), fixed-mount (F/M). With auxiliary switch- 120/240/480 volt, shunt trip- 48 volt DC. Used tested with report
SKU: MCCB2209
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Picture of Eaton RD316T32W Breaker 1600A 600VAC F/M M/O

Eaton RD316T32W Breaker 1600A 600VAC F/M M/O

Eaton RD65K Breaker; cat# RD316T32W, 1600 amp, 600 volt AC, 3 pole. With digitrip RMS 310 trip unit cat# RES1600LSI, LSI functions, ground fault, 1600 amp rating plug cat# 16RES16T, fixed-mount (F/M), manually operated (M/O). Used tested with report.
SKU: MCCB2001
$5,500.00
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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.