EF3B050 - 50Amp Circuit Breaker

EF3B050 - 50 Amp Circuit Breaker

When you’re dealing with an existing electrical setup, you don’t want surprises—you want something that fits, works, and keeps things protected. The EF3B050 molded case circuit breaker does exactly that. It’s a 50-amp, three-pole breaker designed for systems built around the EF3 frame, so it installs without forcing changes to your panel or layout. This breaker is commonly used in three-phase applications where consistent protection matters. It handles overloads and short circuits across a range of standard voltages, including 240VAC, 480VAC, and up to 600VAC. That flexibility makes it a go-to option for many commercial and industrial setups. It’s also rated for operation at 40°C, which lines up with typical working conditions in the field. There’s nothing complicated here—it’s a straightforward component built to last and do its job over time. If you’re maintaining existing equipment or replacing a worn unit, this breaker keeps things simple and predictable.

Key Features and Benefits

• 50-amp breaker for reliable everyday circuit protection
• Three-pole design for three-phase systems
• Made to fit EF3 frame panels without adjustment
• Works across common voltage levels (240V, 480V, 600V)
• Molded case construction for steady, consistent performance
• Built to last in real-world operating conditions

Technical Specifications

• Part Number: EF3B050
  
• Amperage: 50A
  
• Poles: 3
  
• Frame Type: EF3
  
• A.I.C. Rating:
  • 14k @ 600VAC
  • 14k @ 480VAC
  • 18k @ 240VAC
• Operating Temperature: 40°C
  
• Type: Molded Case Circuit Breaker
  
• Weight: 4.5 lbs
  
• Height: 6.0 inches
  

Material Compliance and Certifications

• Built in line with standard electrical safety requirements
• Meets applicable UL and ANSI guidelines
• Suitable for systems that require compliant circuit protection components

Where It Works Best

• This breaker is typically used in commercial buildings, industrial spaces, and equipment panels that already use EF3 frame breakers. You’ll see it in applications like HVAC systems, lighting distribution, and machinery circuits. If you’re keeping an existing system up and running, this is the kind of part that fits in without creating extra work.