- Catalog
- Find A Branch
- KeepStock
- Help
- 1-800-GRAINGER
Register
Sign In
Sign In to access your account information.
Sign In Register Forgot User ID? Forgot Password?All Products
Unrelated Links
Product Categories
- All Product Categories
- Abrasives
- Adhesives, Sealants and Tape
- Cleaning and Janitorial
- Electrical
- Electronics & Batteries
- Fasteners
- Fleet & Vehicle Maintenance
- Furnishings, Appliances & Hospitality
- HVAC and Refrigeration
- Hardware
- Hydraulics
- Lab Supplies
- Lighting
- Lubrication
- Machining
- Material Handling
- Motors
- Office Supplies
- Outdoor Equipment
- Packaging & Shipping
- Paints, Equipment and Supplies
- Pipe, Hose, Tube & Fittings
- Plumbing
- Pneumatics
- Power Transmission
- Pumps
- Raw Materials
- Reference and Learning Supplies
- Safety
- Security
- Test Instruments
- Tools
- Welding
Sign In
Sign In to access your account information.
Sign In Register Forgot User ID? Forgot Password?Molded Case Circuit Breakers
1,496 products
Molded case circuit breakers interrupt current flows in the event of a fault to protect devices from electrical damage. Their current-carrying parts, mechanisms, and trip devices are all completely contained in a molded case of insulating material. They have higher interrupt ratings than miniature circuit breakers to serve high-power industrial and commercial applications, such as control panels, OEM, and electrical distribution equipment. Molded case circuit breakers must be replaced by the same brand of breaker to maintain functionality.