ET4037 - 100Amp Circuit Breaker

ET4037 - 100 Amp Circuit Breaker

If you’re trying to keep an existing electrical system up and running, the ET4037 circuit breaker gives you exactly what you need—no guesswork, no modifications. It’s a 100-amp, 3-pole molded-case circuit breaker designed for F-frame setups, making it a straightforward replacement when the original breaker needs to be swapped out. This unit is commonly used in commercial and industrial environments where 480VAC systems are standard. With a 14kA interrupting rating, it’s built to handle fault conditions while keeping your system protected safely. It’s also rated for 40°C environments, which covers most real-world operating conditions you’ll run into. In other words, it fits where it’s supposed to fit, and it works the way you expect it to work.

Key Features and Benefits

• Designed for form, fit, and function compatibility with F-frame breakers
• 100 amp rating for dependable overcurrent protection
• 3-pole design ideal for three-phase systems
• 14kA interrupting capacity at 480VAC for handling short-circuit conditions
• Molded case construction is built for consistent, long-term use
• Rated for 40°C ambient temperatures, suitable for typical installations

Technical Specifications

• Part Number: ET4037
  
• Amperage: 100A
  
• Poles: 3
  
• A.I.C. Rating: 14kA @ 480VAC
  
• Frame Type: F
  
• Temperature Rating: 40°C
  
• Type: Molded Case Circuit Breaker
  
• Shipping Weight: 4.5 lbs
  
• Height: 10.0 inches
  

Material Compliance and Certifications

• Meets commonly accepted industry standards for molded case circuit breakers
• Suitable for use in systems aligned with UL and ANSI requirements
• Supports installations that follow standard commercial and industrial electrical codes

Where It Works Best

• The ET4037 is a good fit for panelboards, switchboards, and distribution systems already built around F-frame breakers. You’ll typically see it used in commercial buildings, manufacturing facilities, and other industrial settings running 480VAC power. It’s especially useful for maintenance and repair work where keeping the original equipment configuration matters.