CHB140 - 40Amp Circuit Breaker

CHB140 - 40Amp Circuit Breaker

The CHB140 is a 40 Amp single-pole breaker used in Eaton CH Loadcenters. It’s most often used as a replacement breaker in existing CH panel installations where keeping the same breaker style and electrical rating is important for proper fit and continued compatibility.

Since it’s part of the CH plug-in family, it installs directly into your compatible loadcenters without modification, which makes replacement work straightforward in panels that are already in place. Inside, it uses a thermal magnetic trip, which responds to both overloads and short circuits under normal operating conditions. It’s built for standard branch circuit protection in systems that are already designed around Eaton CH equipment.

The CHB140 is rated for 120/240V systems with a 10kA interrupting rating, and it’s commonly used in residential and light commercial electrical systems where CH panelboards are already installed.

This breaker is typically used in maintenance and repair work where the goal is simple—replace like-for-like and keep the system operating within its original design.

Key Features and Benefits

• 40 Amp single-pole breaker for Eaton CH Loadcenters
• Plug-in design for compatible CH panelboards
• Thermal magnetic protection for overloads and short circuits
• Rated for 120/240V systems
• 10kA interrupting rating
• Used in higher-load 120V branch circuits
• Designed for replacement in existing CH installations
• Maintains compatibility with CH panel layouts
• Common choice for like-for-like breaker replacement

Technical Specifications

• Catalog Number: CHB140
  
• Product Name: Eaton CH thermal magnetic circuit breaker
  
• Type: CHB
  
• Amperage Rating: 40 Amps
  
• Voltage Rating: 120/240V
  
• Poles: 1
  
• Interrupt Rating: 10 kAIC
  
• Wire Size: #8–4 AWG
  
• Mounting Style: Plug-in (CH Loadcenters)
  
• Dimensions: 3.7 in D x 3.5 in H x 1.5 in W
  
• Weight: 0.55 lb

Material Compliance and Certifications

• The CHB140 is UL 489 listed and intended for use in Eaton CH Loadcenters. It’s designed for replacement and maintenance work in existing electrical systems. Installation should always be handled by a qualified electrician and performed in accordance with applicable electrical codes and safety standards.

Where It Works Best

• Eaton CH Loadcenters and compatible CH panelboards
• Heavier residential branch circuits
• Light commercial electrical systems
• Replacement of existing CHB-series breakers
• Maintenance work in installed CH panels
• Applications requiring 40A single-pole protection