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.
TP3030TTRE1CR GE Power Break Breaker 3000 Amp 600 VAC E/O
General Electric TP3030TTRE1CR Power Break; 3000 amp with 3000 amp rating plug. Cat.# TR30B3000 Micro Versa Trip, cat.# TT32LI with shunt trip 120 to 240 VAC with auxiliary switch, control voltage 120 VAC, electrically operated (E/O), 600 volt AC, used tested with report.
SKU: MCCB1103
$9,900.00
SSD30D330 GE Power Break II Circuit Breaker 3000 Amp 600 VAC E/O D/O
General Electric SSD30D330 Power Break II circuit breaker; 3000 amp, Entelliguard TU trip unit, cat.# GB530L3XXXRXXXX with auxiliary switch- 240 VAC- 125/250 VDC, shunt trip- 24 VAC, 50/60Hz. 24 VDC. Cat.# SPST024, 600 VAC, electrically operated (E/O), 120 VAC, 50/60 Hz. cat.# SPE120, remote close, 120 VAC, 50/60Hz. cat.# SPRC120, draw-out (D/O), used tested with report *Missing trip cover & upper hinge broken off*.
SKU: MCCB1519
$15,000.00
SSD30D330 GE Power Break II Circuit Breaker 3000 Amp 600 VAC E/O D/O
General Electric SSD30D330 Power Break II circuit breaker; 3000 amp, Entelliguard TU trip unit, cat.# GB530L3XXXRXXXX with auxiliary switch, 240 VAC, 125/250 VDC with shunt trip 24 VAC, 50/60Hz. 24 VDC. Cat.# SPST024 600 VAC electrically operated (E/O), 120 VAC, 50/60 Hz. cat.# SPE120, remote close, 120 VAC, 50/60Hz. cat.# SPRC120, draw-out (D/O), used tested with report.
SKU: MCCB1521
$15,000.00
SSD30D330 GE Power Break II Circuit Breaker 3000 Amp 600 VAC E/O D/O
General Electric SSD30D330 Power Break II circuit breaker; 3000 amp Entelliguard TU trip unit, cat.# GB530L3XXXRXXXX with 3000 amp rating plug. Cat.# GTP3000U3064 with auxiliary switch 240 VAC, 125/250 VDC, 600 VAC, electrically operated (E/O), 120 VAC, 50/60 Hz. cat.# SPE120 remote close, 120 VAC, 50/60Hz. cat.# SPRC120 draw-out (D/O), used tested with report. *Missing Trip Cover* *Electrically Operated Switch Broken*
SKU: MCCB1523
$15,000.00
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
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
THPMMF86 GE Power Break 3000 Amp 600 VAC MO/FM
General Electric THPMMF86 Power Break Circuit Breaker; 3000 amp, 600 volt, 3 pole. With shunt trip, auxiliary switch, manually operated (M/O), fixed-mount (F/M), used tested with report.
SKU: MCCB1851
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Schneider Electric MasterPact NW 30 H Breaker 3000 Amp 600 VAC LSI M/O D/O
Schneider Electric WG3HHR33A9CFFFWXEX MasterPact Breaker; NW 30 H, 3000 amp, 600 volt AC, 3 pole. With micrologic 5.0 trip unit, LSI functions, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1861
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THPMMF86 GE Power Break Breaker 3000 Amp 600 VAC M/O F/M
General Electric THPMMF86 Power Break Breaker; 3000 amp, 600 volt AC, three pole. With shunt trip, auxiliary switch, manually operated (M/O), fixed-mount (F/M), used tested with report.
SKU: MCCB1869
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TP3030TTR GE Power Break Breaker 3000 Amp 600 VAC M/O F/M
General Electric TP3030TTR Power Break Breaker; 3000 amp, 600 volt AC, three pole. With MicroVersaTrip Plus cat# C330LSH, 3000 rating plug cat# TR30B3000, shunt trip 120V-240 volt AC, key interlock, manually operated (M/O) fixed-mount (F/M). Used tested with report.
SKU: MCCB1814
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Schneider Electric MasterPact NW30H Circuit Breaker 3000 Amp 600 VAC M/O D/O
Schneider Electric NW30H MasterPact circuit breaker; cat # WG3HHR33A9CFFFWXEX, 3000 amp, 600 Volt AC, three pole. With MicroLogic 5.0A with LSI functions, manually operated (M/O), draw-out (D/O). Used tested with report.
SKU: MCCB1917
$6,000.00
NW30H Schneider Electric MasterPact Breaker 3000 Amp 600 VAC LSI M/O D/O
Schneider Electric NW30H MasterPact circuit breaker; cat # WG3HHR33A9CFFFWXEX, 3000 amp, 600 volt AC, three pole. With MicroLogic 5.0A with LSI functions, manually operated (M/O), draw-out (D/O). Used tested with report.
SKU: MCCB1918
$6,000.00
GE SSD30D330 Power-Break II Circuit Breaker 3000 Amp 600 Volt AC E/O D/O
General Electric SSD30D330 Power-Break II Circuit Breaker; 3000 amp, 600 volt AC, three pole. With Power + trip unit cat# D330LSIT2, LSI functions, 3000 amp rating plug cat# TR30C3000GF, shunt trip cat# SPST120- 120 volt AC- 125 volt DC, electrically operated (E/O), draw-out (D/O), keyed interlock *Missing trip cover*, used tested with report.
SKU: MCCB1952
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THPMMF86 GE Power Break Circuit Breaker 3000 Amp 600 VAC M/O F/M
General Electric THPMMF86 Power Break Circuit Breaker; 3000 amp, 600 volt AC, three pole. With shunt trip, auxiliary switch, manually operated (M/O), fixed-mount (F/M), used tested with report.
SKU: MCCB1852
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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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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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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 MP30H2 Circuit Breaker 3000 Amp 600 Volt AC E/O D/O
Merlin Gerin MasterPact MP30H2 Circuit Breaker; 3000 amp, 600 volt AC, 3 pole. With STR 38 S trip unit, LS functions, auxiliary switch, shunt trip, charged motor switch, closing release, electrically operated (E/O), draw-out (D/O). Used tested with report.
SKU: MCCB2042
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Merlin Gerin MasterPact MP30H2 Circuit Breaker 3000 Amp 600 Volt AC E/O D/O
Merlin Gerin MasterPact MP30H2 Circuit Breaker; 3000 amp, 600 volt AC, 3 pole. With STR 38 S trip unit, LS functions, auxiliary switch, shunt trip, charged motor switch, closing release, electrically operated (E/O), draw-out (D/O). Used tested with report.
SKU: MCCB2043
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Square D MasterPact NW30H Circuit Breaker 3000 Amp 600 Volt AC M/O F/M
Square D MasterPact NW30H Circuit Breaker; cat# WL3HGG43A9SXFXXXXX 3000 amp, 600 volt AC, 3 pole. With 2500 amp rating plug, manually operated (M/O), fixed-mount (F/M). Used tested with report. **No Trip Unit
SKU: MCCB2064
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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.
