Browse Store Molded & Insulated Case Circuit Breakers
Eaton RGH65K Circuit Breaker RGH316038E 1600 Amp 600 Volt AC F/M M/O
General Electric THED134070 Circuit Breaker
HJA26015 Square D I-Line Circuit Breaker
HJA26020 Square D I-Line Circuit Breaker
HJA26025 Square D I-Line Circuit Breaker
HJA26030 Square D I-Line Circuit Breaker
HJA26035 Square D I-Line Circuit Breaker
HJA26040 Square D I-Line Circuit Breaker
HJA26045 Square D I-Line Circuit Breaker
HJA26050 Square D I-Line Circuit Breaker
HJA26060 Square D I-Line Circuit Breaker
HJA26070 Square D I-Line Circuit Breaker
HJA26080 Square D I-Line Circuit Breaker
HJA26090 Square D I-Line Circuit Breaker
HJA26100 Square D I-Line Circuit Breaker
HJA26110 Square D I-Line Circuit Breaker
HJA26125 Square D I-Line Circuit Breaker
HJA26150 Square D I-Line Circuit Breaker
HJA36015 Square D I-Line Circuit Breaker
HJA36020 Square D I-Line Circuit Breaker
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.