EF3B150 - 150Amp Circuit Breaker

EF3B150 - 150 Amp Circuit Breaker

If you’re maintaining an existing electrical system and need a breaker that fits right the first time, the EF3B150 molded case circuit breaker is a straightforward, dependable solution. Designed for EF3 frame setups, this 150-amp, 3-pole breaker is built to match the form and function your system already relies on—no unnecessary adjustments or guesswork. It handles everyday protection demands across multiple voltage levels, giving you confidence that your equipment stays protected during overloads and fault conditions. With its molded case construction and 40°C rating, this breaker is made for consistent operation in standard environments and built to last through years of use.

Key Features and Benefits

• 150 Amp Rating – Handles steady electrical loads in commercial and industrial systems
• 3-Pole Design – Ideal for three-phase power distribution
• Reliable Interrupting Capacity –
  • 14k A.I.C. @ 600VAC
  • 14k A.I.C. @ 480VAC
  • 18k A.I.C. @ 240VAC
• EF3 Frame Fit – Designed to match existing EF3 installations for seamless replacement
• Molded Case Housing – Helps shield internal components from dust and incidental contact
• 40°C Rated Operation – Suitable for standard ambient temperature conditions

Technical Specifications

• Part Number: EF3B150
  
• Amperage: 150A
  
• Poles: 3
  
• Frame Type: EF3
  
• Interrupting Capacity:
  • 14k @ 600VAC
  • 14k @ 480VAC
  • 18k @ 240VAC
• Temperature Rating: 40°C
  
• Breaker Type: Molded Case Circuit Breaker
  
• Height: 6.0 inches
  
• Weight: 4.5 lbs
  

Material Compliance and Certifications

• Industry Standards: The EF3B150 is produced using materials and construction methods commonly accepted in the electrical industry. Molded case circuit breakers of this type are generally manufactured to align with UL and ANSI safety standards.
• Compliance Note: Always verify compliance requirements based on your specific installation and local electrical codes.
  

Where It Works Best

• This breaker is a practical fit for panelboards, switchboards, and distribution systems already using EF3 frame components. You’ll typically find it in commercial buildings, industrial facilities, and equipment control panels where maintaining compatibility is key. It’s especially useful when replacing an existing breaker and keeping your system configuration unchanged.