EF3B100 - 100Amp Circuit Breaker

EF3B100 - 100 Amp Circuit Breaker

When you're working with an existing electrical system, the last thing you want is guesswork. The EF3B100 molded case circuit breaker gives you a straightforward, dependable replacement option that fits right into EF3 frame setups. Rated at 100 amps with a 3-pole configuration, it’s built to handle the demands of commercial and industrial power distribution without overcomplicating installation. Whether you're managing a facility upgrade or replacing a worn unit, this breaker helps keep your system protected from overloads and short circuits—just as it was originally designed to do.

With interrupting ratings of 14k A.I.C. at 600VAC and 480VAC, and 18k A.I.C. at 240VAC, the EF3B100 is suited for a range of standard voltage applications. Its molded case construction is designed for durability and repeated use, while the 40°C calibration ensures consistent operation in typical ambient conditions. Simply put, it’s a practical, built-to-last solution for keeping your electrical distribution system running safely and efficiently.

Key Features and Benefits

• 100 Amp Rating – Ideal for protecting circuits with moderate to heavy electrical loads
• 3-Pole Design – Supports three-phase electrical systems commonly found in commercial and industrial settings
• EF3 Frame Fit – Designed for direct compatibility with existing EF3 breaker installations
• Reliable Interrupting Capacity –
  • 14k A.I.C. @ 600VAC
  • 14k A.I.C. @ 480VAC
  • 18k A.I.C. @ 240VAC
• Thermal-Magnetic Trip Function – Helps safeguard against overloads and short circuits
• Molded Case Housing – Built to last and withstand everyday operational demands
• 40°C Rated – Performs consistently in standard temperature environments

Technical Specifications

• Part Number: EF3B100
• Amperage: 100A
• Poles: 3
• Frame Type: EF3
• Interrupting Capacity:
  • 14k @ 600VAC
  • 14k @ 480VAC
  • 18k @ 240VAC
• Temperature Rating: 40°C
• Breaker Type: Molded Case Circuit Breaker
• Shipping Weight: 4.5 lbs
• Dimensions (Height): 6.0 inches

Material Compliance and Certifications

• The EF3B100 is manufactured to meet widely recognized electrical industry standards for molded case circuit breakers. It is intended for use in installations aligned with NEC (National Electrical Code) requirements when properly applied. Always verify compatibility with your specific system and local regulations.

Where It Works Best

• Commercial buildings with established electrical infrastructure
• Industrial facilities running three-phase power systems
• Panelboards and distribution equipment requiring EF3 frame breakers
• Maintenance, repair, and replacement of existing circuit protection devices
• Applications operating at 240V, 480V, or 600V