Molded Case Circuit Breakers

Reliable circuit protection

Eaton manufactures a variety of molded case circuit breakers that provide safety and reliability worldwide and in various industries. 

Our molded case circuit breakers (MCCB) are used to provide circuit protection in alternative energy, commercial, industrial, mining, and military applications, where they protect against overloads and short circuits in conductors. 

Our MCCB portfolio

Eaton’s Electrical Sector, under the Eaton brand, offers the widest variety of molded case circuit breakers available today.

Designed for electrical and machinery OEMs serving a range of industries and applications, these proven designs incorporate the latest in innovation with the high reliability that has been our hallmark since the advent of the circuit breaker in the 1920s.

Take a look below at the molded case circuit breakers in our portfolio. 

Power Defense molded case circuit breaker

The Power Defense molded case circuit breaker is globally rated in a small footprint.  It offers communicating electronic trip units and the ability to generate the data to help you optimize your facilities' performance.

Amperage Rating: 15A - 2,500A

Poles: single, two, three, four (0% N, 60% N, 100% N)

Voltage Rating: 240 Vac, 525 Vac, 600 Vac

Series C molded case circuit breaker

The Series C circuit breaker is ideal for panelboards, switchboards, motor control centers, and busway applications. Choose from a premier selection of trip units including thermal magnetic, electronic, and magnetic only switches.

Amperage Rating: 10A - 2,000A 

Poles:  Single, two, three, four

Voltage Rating:  120 Vac - 690 Vac

Series G molded case circuit breaker

The Eaton Series G Molded Case Circuit Breaker delivers superior circuit breaker performance with high-speed “blow-open” action. This globally-rated platform offers users high interruption ratings in a compact footprint with ease of in-field configuration.

Amperage Rating:  15A - 8,000A

Poles:  Single, two, three, four

Voltage Rating:  110-125 Vdc - 600Y/347 V

PV Guard / Solar complete molded case circuit breaker

The Eaton's DC and PVGard molded case circuit breakers are engineered to address the highest performance requirements while providing numerous accessories to fit different site specifications.  Today’s DC circuit breakers have expanded applications including solar photovoltaics, electric vehicle charging stations, battery storage and UPS systems, as well as commercial and industrial DC distribution.

Aperage Rating:  10A - 3,000A

Poles:  Single, two, three, four

Voltage Rating:  1,000 Vdc - 600Y/347 Vac

NZM molded case circuit breaker

Eaton’s NZM portfolio provides a globally rated solution with a broad offering of circuit breakers, accessories, and IEC switch disconnector, ideal for panelbuilders and machinery OEMs worldwide.

Amperage Rating:  3A - 1,600A

Poles:  Three, four

Voltage Rating:  440Vac - 1,500 Vdc

Engine Generator molded case circuit breaker

Users appreciate the custom design and compact footprint of the Eaton Engine Generator Molded Case Circuit Breaker. This circuit breaker is specifically created for generators as well as portable and temporary power applications where lower interrupting currents are common. 

Amperage Rating:  15A - 600A

Circuit Breaker Type:  FG, KG

E2 mining molded case circuit breaker

The Eaton E2 Mining Molded Case Circuit Breaker offers a higher quality experience and a safer work environment. Rugged design and tested dependability for harsh and hazardous environments make the E2 Mining MCCB the ideal breaker underground. The mining circuit breaker protects all sizes of trailing cable defined by MSHA.

Amperage Rating:  3A - 1,200A

Poles: Two, three 

Voltage Rating:  1,000 Vac - 600 V

Navy & Marine complete molded case circuit breaker

Navy and marine molded case circuit breakers are vibration tested, fire and moisture-resistant, and treated to resist corrosion. Users will appreciate the shock and impact resistance, and the easy on-site customization and installation capabilities. These circuit breakers are qualified to Navy Mil-Spec & QPL, or to Marine Specs.

Amperage Rating:  5A = 1,200A

Poles:  Single, two, three

Voltage Rating:  1,000 Vac - 600 Vac, 250 Vdc

Eaton molded case circuit breakers cover the widest range of applications in the industry:

Electrical OEMs

Machinery OEMs

Navy breakers: 

UL 489 Supplement SB 
MIL-C-17588 
MIL-C-17361
ABS/NVR 

Mining breakers up to 1100 Vac 

Earth leakage 

DC breakers 125–750 Vdc 

Engine generator breakers 15–1200 amperes 

Current limiting breakers

• Machine Tool Control Panels and Motor Control Centers
  Designed for these equipment requirements, including new world-class accessories.
• Panelboards
  As both main and branch circuit protection devices. Feeder Pillars In distribution systems to provide main and branch circuit protection.
• Switchgear
  In distribution systems to provide main and branch circuit protection up to 2500 amperes (RG-Frame)
• Busbar Trunking Tap-Offs
  In busbar trunking tap-offs to provide circuit protection.
• Individual Enclosures
  Completely assembled in enclosures to meet specific customer requirements.
• Additional Applications
  Special versions of each Eaton frame are available to provide safe equipment control and protection in mining and other applications. Contact your Eaton agent or distributor for additional information.