Browse Store Molded & Insulated Case Circuit Breakers
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- I - Instantaneous
- LI - Long-Time and Instantaneous
- IG - Instantaneous and Ground
- LIG - Long-Time, Instantaneous, Ground
- LS - Long-Time and Short-Time
- LSG - Long-Time, Short-Time, Ground
- LSI - Long-Time, Short-Time, Instantaneous
- LSIG - Long-Time, Short-Time, Instantaneous, Ground
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.
M40H1 Merlin-Gerin Masterpact Circuit Breaker 4000 Amp 600 VAC M/O D/O
Merlin-Gerin M40H1 Masterpact circuit breaker: 4000 amp, 600 volt AC. STR58U trip unit with LSIG, ground fault, manually operated (M/O), draw-out (D/O) with draw-out cubicle, used tested with report.
SKU: MCCB1379
$15,000.00
Merlin Gerin Masterpact MP08 H1 Circuit Breaker 800 Amp 600 VAC M/O D/O
Merlin Gerin MP08 H1 Masterpact circuit breaker; 800 amp, 600 volt AC, 3 pole. With 600 amp rating plug cat# 54745, STR 28 D trip unit, auxiliary switches, overcurrent trip switch, alarm, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1779
$1,500.00
Merlin Gerin Masterpact MP08 H1 Circuit Breaker 800 Amp 600 VAC M/O D/O
Merlin Gerin MP08 H1 Masterpact circuit breaker; 800 amp, 600 volt AC, 3 pole. With 600 amp rating plug cat.# 54745, STR 28 D trip unit, auxiliary switches, overcurrent trip switch, alarm, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1780
$1,500.00
Merlin Gerin Masterpact MP08H1 Circuit Breaker 800 Amp 600 VAC M/O D/O
Merlin Gerin MP08 H1 Masterpact circuit breaker; 800 amp, 600 volt AC, 3 pole. With 600 amp rating plug cat.# 54745, STR 28 D trip unit, auxiliary switches, overcurrent trip switch, alarm, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1781
$1,500.00
Merlin Gerin Masterpact MP08 H1 Circuit Breaker 800 Amp 600 VAC M/O D/O
Merlin Gerin MP08 H1 Masterpact circuit breaker; 800 amp, 600 volt AC, 3 pole. With 600 amp rating plug cat.# 54745, STR 28 D trip unit, auxiliary switches, overcurrent trip switch, alarm, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1782
$1,500.00
Merlin Gerin Masterpact MP08 H1 Circuit Breaker 800 Amp 600 VAC M/O D/O
Merlin Gerin MP08 H1 Masterpact circuit breaker; 800 amp, 600 volt AC, 3 pole. With 600 amp rating plug cat.# 54745, STR 58 U trip unit, LSI functions, auxiliary switches, overcurrent trip switch, alarm, shunt trip, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1783
$1,500.00
Merlin Gerin Masterpact MP08H1 Circuit Breaker 800 Amp 600 VAC M/O D/O
Merlin Gerin MP08H1 Masterpact circuit breaker; 800 amp, 600 volt AC, 3 pole With 600 amp rating plug cat # 54745, STR 58 U trip unit, LSI functions, auxiliary switches, overcurrent trip switch, alarm, shunt trip, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1784
$1,500.00
Merlin Gerin Masterpact MP08 H1 Circuit Breaker 800 Amp 600 VAC M/O D/O
Merlin Gerin MP08 H1 Masterpact circuit breaker; 800 amp, 600 volt AC, 3 pole. With 600 amp rating plug cat.# 54745, STR 28 D trip unit, auxiliary switches, overcurrent trip switch, alarm, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1786
$1,500.00
Merlin Gerin Masterpact MP16H1 Circuit Breaker 1600 Amp 600 VAC M/O D/O
Merlin Gerin MP16H1 Masterpact circuit breaker; 1600 amp max, 600 volt AC, 3 pole. With 1200 amp rating plug, ST 408 S trip unit, auxiliary switches- 10A/240 VAC, 6A/480 VAC, 3A/600 VAC, 5A/125 VDC, 25A/250 VDC, fault indicator- 24 to 250 volt AC/DC, overcurrent- 10A/240 VAC, Manually operated (M/O), draw-out (D/O), draw out cubicle, used tested with report.
SKU: MCCB1703
$3,300.00
Merlin Gerin Masterpact MP16H1 Circuit Breaker 1600 Amp 600 VAC M/O D/O
Merlin Gerin MP16H1 Masterpact circuit breaker; 1600 amp max, 600 volt AC, 3 pole. With ST 208 D trip unit, auxiliary switches- 10A/240 VAC, 6A/480 VAC, 3A/600 VAC, 5A/125 VDC, 25A/250 VDC, overcurrent- 10A/240 VAC, Manually Operated (M/O), Draw-out (D/O), draw-out cubicle, used tested with report.
SKU: MCCB1704
$3,300.00
Merlin Gerin Masterpact MP16H1 Circuit Breaker 1600 Amp 600 VAC M/O D/O
Merlin Gerin MP16H1 Masterpact circuit breaker; 1600 amp max, 600 volt AC, 3 pole. With 1200 amp rating plug cat.# 54750, STR 38 S trip unit, LSI functions, auxiliary switches- 10A/240 VAC, 6A/480 VAC, 3A/600 VAC, .5A/125 VDC, .25A/250 VDC. With overcurrent switch- 10A/240 VAC, LT alarm- .1A/240 VAC, manually operated (M/O), draw-out (D/O), draw-out cubicle, used tested with report.
SKU: MCCB1705
$3,300.00
Merlin Gerin Masterpact MP16H1 Circuit Breaker 1600 Amp 600 VAC D/O E/O
Merlin Gerin MP16H1 Masterpact circuit breaker; 1600 amp, 600 volt AC, 3 pole. With STR 58U trip unit, LSIG functions, ground fault, 1600 amp rating plug cat.# 54754, auxiliary switch, overcurrent trip switch, LT alarm, motor & charged switch, draw out (D/O), electrically operated (E/O), used tested with report.
SKU: MCCB1795
$5,500.00
Merlin Gerin Molded Case Switch MP16NA Breaker 1600 Amp 600 VAC E/O D/O
Merlin Gerin MP16NA molded case switch; 1600 amp, 600 Volt AC, 3 pole. With auxiliary switches, shunt trip- 24 VDC, closing release- 24 VDC, under voltage release, motor & charged switch- 24 VDC, control C.T's, electrically operated (E/O), draw-out (D/O) cubicle, used tested with report.
SKU: MCCB1789
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Merlin-Gerin Masterpact MP20H1 Circuit Breaker 2000 Amp 600 VAC E/O D/O
Merlin-Gerin MP20H1 Masterpact circuit breaker: 2000 amp, 600 volt AC, 3 pole. With 2000 amp rating plug cat# 54758, STR38S trip unit with LSIG functions, ground fault, overcurrent trip switch, auxiliary switches, shunt trip, alarm switch, electrically operated (E/O), draw-out (D/O), draw-out cubicle, used tested with report.
SKU: MCCB1385
$6,900.00
Merlin-Gerin Masterpact MP30H1 Circuit Breaker 3000 Amp 600 VAC E/O
Merlin-Gerin MP30H1 Masterpact circuit breaker: 3000 amp, 600 volt AC. With 3000 amp rating plug cat.#54766, STR28D trip unit with LI functions, auxiliary switches, overcurrent trip switch, shunt trip, alarm switch, electrically operated (E/O), motor and "charged" switch, closing release, used tested with report.
SKU: MCCB1390
$6,600.00
MP16H1 Merlin Gerin Masterpact Circuit Breaker 1600A 3P 600 VAC M/O D/O
Merlin Gerin MP16H1 Masterpact circuit breaker: 1600 amp, three pole, 600 volt AC. With STR 38 S trip unit, LSIG functions, ground fault, 1600 amp rating plug cat.# 54754, auxiliary switches, overcurrent trip switch, LT alarm, 100% rated, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1877
$5,500.00
Merlin Gerin Masterpact MP30 H1 Circuit Breaker 3000A 600 VAC
Merlin Gerin Masterpact MP30 H1 Circuit Breaker; 3000 amp, 600 volt AC, three pole. With shunt trip, auxiliary switches, overcurrent trip switch, LT alarm, closing reverse, motor & charged switch, & mounting carriage, used tested with report.
SKU: MCCB1973
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Merlin Gerin MasterPact MP25 H1 Circuit Breaker 2500A 600 VAC E/O F/M
Merlin Gerin MasterPact MP25 H1 circuit breaker; 2500 amp, 600 volt AC, 3 pole. With auxiliary switch, over current trip, shunt trip, electrically operated (E/O), fixed mount (F/M), used tested with report.
SKU: MCCB1987
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Merlin Gerin MasterPact MP30H1 Circuit Breaker 3000A 600 VAC D/O E/O
Merlin Gerin MasterPact MP30H1 Circuit Breaker; 3000 amp, 600 volt AC, 3 pole. With AC-Pro-MP trip unit, mounting carriage, draw-out (D/O), electrically operated (E/O), used tested with report.
SKU: MCCB1996
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Merlin Gerin MasterPact MP40H1 Circuit Breaker 4000A 600 VAC M/O D/O
Merlin Gerin MasterPact MP40H1 Circuit Breaker; 4000 amp, 600 volt AC, 3 pole. With STR 38 S trip unit, LSI functions, 4000 amp rating plug cat# 54770, shunt trip, closing release, motor & charged switch, auxiliary switch, LT alarm, overcurrent trip switch, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1962
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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 |
| 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.
