1-800-328-1842
Browse EMSCO's online catalog Browse Store
Busway & Plugs
Bus Plugs Bus Duct Tap Boxes & Accessories
Circuit Breakers
Molded & Insulated Case Circuit Breakers Air Circuit Breakers Vacuum Circuit Breakers Motor Circuit Protectors
Switches
Panelboard Switches Pressure Contact Switches Safety Switches Transfer Switches
Motor Control
MCC Buckets & Structure Starters Variable-Frequency Drive (VFD)
Switchgear
Low Voltage Switchgear Medium Voltage Switchgear
Transformers
Low Voltage Transformers Medium Voltage Transformers Auto-Transformers

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 Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D NW16L1 Masterpact circuit breaker: cat# WA8EER63B3DXBXXXCA 1600 amp frame, 600 volt AC, three pole. With 1600 amp rated Micro logic 5.0P trip with unit UL plug B with LSI functions, 200kA @ 480 volt mod bus, shunt trip- 24-30 Volt AC/DC, pad lockable, push button cover, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1404
$3,300.00
View product Add to cart
Picture of Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D NW16L1 Masterpact circuit breaker; cat# WA8EER63B3DXBXXXCA, 1600 amp frame, 600 volt AC, three pole. With 1600 amp rated Micrologic 5.0P trip unit (UL plug B), LSI functions, 200kA @ 480V Modbus, shunt trip- 24-30 Volt AC/DC, pad lockable push button cover, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1405
$3,300.00
View product Add to cart
Picture of Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D NW16L1 Masterpact circuit breaker; cat.#WA8EER63B3DXBXXXCA, 1600 amp frame, 600 volt AC, three pole. With 1600 amp rated Micrologic 5.0P trip unit, (UL plug B), LSI functions, 200kA @ 480 volt Modbus, shunt trip- 24-30 volt AC/DC, pad lockable push button cover, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1409
$3,300.00
View product Add to cart
Picture of Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D NW16L1 Masterpact circuit breaker: cat# WA8EER64B3DXBXXXCA, 1600 amp frame, 600 volt AC, three pole. With 1600 amp rated (UL plug B) micro logic 6.0P trip unit, LSIG functions, ground fault protection, 200kA @ 480 volt Modbus, shunt trip- 24-30 Volt AC/DC, pad lockable push button cover, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1412
$3,900.00
View product Add to cart
Picture of Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D NW16L1 Masterpact circuit breaker; cat.#WA8EER63B3DXBXXXCA, 1600 amp frame, 600 volt AC, three pole. With 1600 amp rated Micro logic 5.0P trip unit (UL plug B) LSI functions, 200kA @ 480 volt Mod bus, shunt trip- 24-30 VAC/DC, pad lockable push button cover, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1413
$3,300.00
View product Add to cart
Picture of Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D NW16L1 Masterpact circuit breaker; cat# WA8EER63B3DXBXXXCA, 1600 amp frame, 600 volt AC, three pole. With 1600 amp rated Micrologic 5.0P trip unit (UL plug B), LSI functions, 200kA @ 480 volt modbus, shunt trip- 24-30 Volt AC/DC, pad lockable push button cover, manually operated (M/O), draw-out (D/O), used tested with report. *Chipped Corners*
SKU: MCCB1415
$3,300.00
View product Add to cart
Picture of Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O

Square D NW16L1 Masterpact circuit breaker; cat# WA8EER63B3DXBXXXCA, 1600 amp frame, 600 volt AC, three pole. With 1600 amp rated Micro logic 5.0P trip unit, (UL plug B), LSI functions, 200kA @ 480 volt modbus, shunt trip- 24-30 volt AC/DC, pad lockable push button cover, manually operated (M/O), draw-out (D/O), used tested with report. *Chipped Corners*
SKU: MCCB1416
$3,300.00
View product Add to cart
Picture of Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O Tested

Square D Masterpact NW16L1 Circuit Breaker 1600 Amp 600 VAC M/O D/O Tested

Square D NW16L1 Masterpact circuit breaker; cat.#WA8EER63B3DXBXXXCA, 1600 amp frame, 600 volt AC, 3 pole. With 1600 amp ratted, micro logic 5.0P trip unit (UL plug B), LSI functions, 200kA @ 480 volt Modbus, shunt trip- 24-30 VAC/DC, pad lockable push button cover, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1402
$3,750.00
View product Add to cart
Picture of Square D Masterpact NW20L1 Circuit Breaker 2000 Amp 600 VAC M/O D/O Tested

Square D Masterpact NW20L1 Circuit Breaker 2000 Amp 600 VAC M/O D/O Tested

Square D NW20L1 Masterpact circuit breaker; cat# WA8FFR64A3DXBXXXCA, 2000 amp frame, 600 volt AC, 3 pole. With 2000 amp rated Micro logic 5.0P trip unit, LSI function, modbus, shunt trip- 24-30 Volt AC/DC, pad lockable, push button cover, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1411
$6,000.00
View product Add to cart
Picture of Square D Masterpact NW40H2 Circuit Breaker 4000 Amp 600 VAC E/O D/O

Square D Masterpact NW40H2 Circuit Breaker 4000 Amp 600 VAC E/O D/O

Square D NW40H2 MasterPact circuit breaker: cat.# YA5KKR63A3SFBFXXXX, 4000 amp frame, 600 volt AC, three pole, 4000 amp rated. 85kA @ 480V, Micrologic 5.0 P trip unit with LSI functions, Modbus, spring charging motor- 100-130 Volt AC/DC, shunt trip- 24-30 Volt AC/DC, closing coil - 100-130 VAC/DC, electrically operated (E/O), draw-out (D/O), used tested with report.** Small Chip in Bottom RT. Corner**.
SKU: MCCB1506
$21,600.00
View product Add to cart
Picture of Square D MasterPact NW40H2 Circuit Breaker 4000 Amp 600 Volt AC

Square D MasterPact NW40H2 Circuit Breaker 4000 Amp 600 Volt AC

Square D MasterPact NW40H2 low- voltage power circuit breaker; 4000 amp cat# YA5KKR64A3GGFFWXCX, 600 volt AC, 3 pole. With micrologic 6.0 P trip unit, LSIG functions, ground fault. spring charging motor: 100-130 volt DC, shunt trip: 100-130 volt AC/DC, closing coil: 100-130 volt AC/DC. Used tested with report.
SKU: MCCB2083
Contact us for pricing:
View product
Picture of Square D NW32 Non-Automatic Switch 3200 Amp 600 VAC M/O D/O

Square D NW32 Non-Automatic Switch 3200 Amp 600 VAC M/O D/O

Square D NW32 non-automatic switch; cat# YA8JHRNNX9DXBXXXCAR, 3200 amp frame, 600 volt AC, 3 pole. With 3000 amp rated, shunt trip- 24-30 Volt AC/DC, automatic reset, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1417
$4,500.00
View product Add to cart
Picture of Square D NW32 Non-Automatic Switch 3200 Amp 600 VAC M/O D/O

Square D NW32 Non-Automatic Switch 3200 Amp 600 VAC M/O D/O

Square D NW32 non-automatic switch; cat# YA8JHRNNX9DXBXXXCAR, 3200 amp frame, 600 volt AC, 3 pole. With 3000 amp rated, three pole, shunt trip- 24-30 volt AC/DC, automatic reset, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1421
$4,500.00
View product Add to cart
Picture of Square D NW32 Non-Automatic Switch 3200 Amp 600 VAC M/O D/O

Square D NW32 Non-Automatic Switch 3200 Amp 600 VAC M/O D/O

Square D NW32 non-automatic switch; cat# YA8JHRNNX9DXBXXXCAR, 3200 amp frame, 600 volt AC, 3 pole. With 3000 amp rated, shunt trip- 24-30 Volt AC/DC, automatic reset, manually operated (M/O), draw-out (D/O), used tested with report.
SKU: MCCB1422
$4,500.00
View product Add to cart
Picture of Square D PAF2036 Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Square D PAF2036 Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Square D PAF2036 Circuit Breaker; 2000 amp, 600 volt AC, 3 pole. With 1800 amp rating tower, shunt trip- 120 volt AC, coil clearing switch, manually operated (M/O), fixed-mount (F/M). Used tested with report.
SKU: MCCB2113
Contact us for pricing:
View product Add to cart
Picture of Square D PAF361200G Circuit Breaker 1200 Amp 600 Volt AC M/O F/M

Square D PAF361200G Circuit Breaker 1200 Amp 600 Volt AC M/O F/M

Square D PAF361200G circuit breaker; 1200 amp, 600 volt AC, 3 pole. With ground fault shunt trip. manually operated (M/O), fixed-mount (F/M). Used tested with report.
SKU: MC-CB#2062
Contact us for pricing:
View product
Picture of Square D PAF362000DC2100 Circuit Breaker 2000 Amp 500 Volt DC E/O F/M

Square D PAF362000DC2100 Circuit Breaker 2000 Amp 500 Volt DC E/O F/M

Square D PAF362000DC2100 Circuit Breaker; 2000 amp, 500 volt DC, 3 pole, electrically operated (E/O), fixed-mount (F/M). With coil release switch, shunt trip, auxiliary switch. Used tested with report.
SKU: MCCB2210
Contact us for pricing:
View product
Picture of Square D PAL Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Square D PAL Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Square D PAL Circuit Breaker; cat # PHF3616001386, 2000 amp frame, 600 volt AC, 3 pole, manually operated (M/O), fixed-mount (F/M). With 1600 amp rating tower, shunt trip, auxiliary switch. Used tested with report.
SKU: MCCB2152
Contact us for pricing:
View product
Picture of Square D PEF361200LSI021 Circuit Breaker 1200 Amp 600 Volt AC M/O F/M

Square D PEF361200LSI021 Circuit Breaker 1200 Amp 600 Volt AC M/O F/M

Square D PEF361200LSI021 Circuit Breaker; 1200 amp, 600 volt AC, 3 pole, manually operated (M/O), fixed-mount (F/M). With micrologic full function series "B" trip unit, LSI functions, 1200 amp rating plug- cat # ARP100, auxiliary switch, shunt trip. Used tested with report. *No mounting feet
SKU: MCCB2228
Contact us for pricing:
View product
Picture of Square D PEF362000LSIC80 Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Square D PEF362000LSIC80 Circuit Breaker 2000 Amp 600 Volt AC M/O F/M

Square D PEF362000LSIC80 Circuit Breaker; 2000 amp, 600 volt AC, 3 pole, manually operated (M/O), fixed-mount (F/M). With micrologic full function series "B" trip unit, LSI functions, 2000 amp rating plug- cat # ARP100, shunt trip, & coil clear switch. Used tested with report. *Shunt mounting point broken 1 screw mount *No mounting feet
SKU: MCCB2229
Contact us for pricing:
View product

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.