EHD3040 - 40Amp Circuit Breaker

EHD3040 - 40 Amp Circuit Breaker

If you’re working on an existing electrical system, you already know how important it is to find a breaker that fits right the first time. The Eaton EHD3040 is built for exactly that. It’s a 40 amp, three-pole molded case circuit breaker designed to match Eaton’s Series C setups, making it a solid choice when you need a direct replacement without reworking your panel. This breaker uses a thermal-magnetic trip unit (T186), which handles both overloads and short circuits in a straightforward, dependable way. Nothing complicated—just the kind of protection you expect in commercial and industrial environments where consistency matters more than anything else. It’s commonly found in panelboards and switchboards that have been in service for years, and it continues to do the job it was designed for. The size and layout are familiar, so installation tends to be simple if you’re replacing an existing unit. Once in place, it does what a breaker should—protect the circuit and keep things running without unnecessary issues. It’s built to last and holds up well under normal operating conditions.

Key Features and Benefits

• 40 amp rating for standard commercial and industrial circuit protection
• Three-pole configuration for three-phase systems
• Designed to match Eaton Series C breaker layouts
• Thermal-magnetic trip unit (T186) for overload and short circuit protection
• Works as a direct replacement in existing equipment
• Compact, familiar form factor for easier installation
• Solid construction intended for long-term use

Technical Specifications

• Catalog Number: EHD3040
  
• Type: Molded Case Circuit Breaker
  
• Series: Series C
  
• Frame: F Frame
  
• Amperage: 40 A
  
• Poles: 3
  
• Trip Type: T186 (Thermal-Magnetic)
  
• Frequency: 50/60 Hz
  
• Interrupting Rating:
  • 18 kAIC at 240 VAC
  • 14 kAIC at 480 VAC
• Dimensions: 3.38" D x 4.13" W x 6" H
  
• Weight: 4.35 lbs
  
• Terminals: Load side
  

Material Compliance and Certifications

• UL Listed
• Meets standard industry requirements for safety and performance

Where It Works Best

You’ll typically see the EHD3040 in commercial buildings, industrial facilities, and similar setups where Eaton Series C breakers are already installed. It’s a practical option for maintenance and repair work—especially when you need something that lines up with the original design and avoids compatibility issues.