CHB340 - 40Amp Circuit Breaker

CHB340 - 40Amp Circuit Breaker

The Eaton CHB340 is a 40 Amp, three-pole circuit breaker used in Eaton CH Loadcenters, and it’s typically chosen when you need a direct replacement that matches what’s already installed in the panel. It’s built for 240V three-pole circuits where all three legs need to trip together, and it installs into compatible CH panels using a plug-in design that keeps everything aligned with the existing setup.

In real-world use, this breaker is commonly found in residential and light commercial systems handling smaller three-pole 240V circuits. Most of the time, it’s not about changing anything in the system—it’s about swapping in a matching breaker so the panel continues running the way it was originally set up. Inside, the CHB340 uses a thermal magnetic trip system, which responds to both overloads and short-circuit conditions. It’s rated at 10 kAIC, which fits typical fault levels found in standard CH residential and light commercial installations. With support for #8–4 AWG wire, it works well for small-to-medium three-pole circuits that still need all poles to trip at the same time.

At the end of the day, the CHB340 is a direct replacement breaker for Eaton CH Loadcenters. It’s meant to keep existing systems consistent and properly matched, without changing the panel layout or creating compatibility issues.

Key Features and Benefits

• 40 Amp, 3-pole breaker for Eaton CH Loadcenters
• Designed for 240V three-pole circuits
• Plug-in installation for compatible CH panels
• Thermal magnetic protection for overloads and short circuits
• 10 kAIC interrupt rating for standard fault conditions
• Compatible with #8–4 AWG conductors
• Three-pole switching for simultaneous disconnect
• Keeps original CH panel layout unchanged
• Common in residential and light commercial systems
• Direct replacement for existing CH breakers

Technical Specifications

• Catalog Number: CHB340
  
• Product Type: Thermal magnetic circuit breaker
  
• Type: CHB
  
• Amperage Rating: 40 Amps
  
• Voltage Rating: 240V AC
  
• Number of Poles: 3
  
• Interrupt Rating: 10 kAIC
  
• Wire Size: #8–4 AWG
  
• Mounting Style: Plug-in (Eaton CH Loadcenters)
  
• Dimensions: 3.3 in D x 3.3 in H x 3.3 in W
  
• Weight: 0.6 lb

Material Compliance and Certifications

• The Eaton CHB340 is UL 489 listed, meeting standard safety requirements for branch circuit protection. It is intended for installation in Eaton CH Loadcenters and should be installed by a qualified electrician following applicable electrical codes and safety requirements.

Where It Works Best

• Eaton CH Loadcenters
• Residential electrical panels
• Light commercial electrical systems
• Three-pole 240V branch circuits
• Replacement of existing CH 40A breakers
• Maintenance work in installed CH systems
• Circuits requiring all poles to trip together