CHH3125H4 - 125Amp Circuit Breaker

CHH3125H4 - 125Amp Circuit Breaker

When you’re dealing with an existing electrical system, the priority is usually straightforward—find a breaker that matches what’s already in place so the panel stays unchanged and the system keeps running the way it was designed. The CHH3125H4 molded case circuit breaker is built for exactly that kind of work. It’s a 125 amp, 3-pole breaker used in systems that require a CHH4-series frame with a fixed (non-interchangeable) trip unit.

This breaker is rated for 240VAC three-phase applications and carries a 42kA interrupting capacity, making it suitable for distribution systems where fault current levels are already defined by the original installation. In practice, it’s used to replace an existing breaker without changing the layout, wiring, or overall setup of the equipment it’s installed in.

Most of the time, this type of breaker shows up during maintenance or repair work in commercial or industrial facilities. The equipment is already in service, so the job isn’t about redesigning anything—it’s about keeping the system consistent by matching the original breaker specs as closely as possible.

In real-world use, the CHH3125H4 is typically installed when the original breaker is already part of a CHH4-series 125 amp, 3-pole setup.

Key Features & Benefits

• 125 Amp, 3-pole molded case circuit breaker
• CHH4-series frame for compatible electrical systems
• Used in 240VAC three-phase applications
• 42kA interrupting rating at 240VAC
• Non-interchangeable factory-set trip unit
• Direct replacement for matching installed breakers
• Helps maintain existing panel layout and configuration
• Used in commercial and industrial maintenance work
• Suitable for established electrical distribution systems

Technical Specifications

• Part Number: CHH3125H4
• Type: CHH4
• Product Category: Molded Case Circuit Breaker
• Amperage Rating: 125 Amps
• Poles: 3
• Voltage Rating: 240VAC
• Interrupting Rating: 42kAIC @ 240VAC
• Trip Unit: Non-Interchangeable
• Dimensions: 4.13"W x 7.50"H x 3.06"D
• Width: 4.13 in.
• Height: 7.50 in.
• Depth: 3.06 in.
• Approximate Shipping Weight: 8.5 lbs

Material Compliance and Certifications

• The CHH3125H4 is intended for use in electrical systems designed to accept compatible CHH4-series molded case circuit breakers. Installation should be completed by qualified electrical personnel and in accordance with all applicable electrical codes and safety standards. Always confirm compatibility with the existing equipment before installation, including voltage rating, interrupting capacity, and physical fit.

Where It Works Best

• Existing CHH4-series panelboards and switchgear
• Commercial electrical systems with established infrastructure
• Industrial facilities and manufacturing environments
• Three-phase power distribution systems
• Feeder and branch circuit applications
• Maintenance and like-for-like replacement work
• Electrical systems requiring a 125 Amp, 3-pole breaker
• Installations requiring a 42kA interrupting rating at 240VAC
• Equipment where maintaining original configuration is important