Eaton CL120 Thermal Magnetic Circuit Breaker - UL 489
Part Number: CL120
Quick Summary
The Eaton CL120 Thermal Magnetic Circuit Breaker is a compact 1-inch classified device providing dependable overcurrent protection for Type CH loadcenters. Replacing legacy breakers can be costly and risky; the CL120 offers a straightforward, space-efficient path to modern protection without rewiring. UL 489 certification, a 1-inch width, and a 10 kAIC interrupt rating support compliant, high‑reliability performance in both residential and light commercial panels. Its compatibility with replacement models across brands reduces spare inventory and procurement complexity, helping electrical teams streamline maintenance and service workflows. By delivering reliable protection with proven standards, the CL120 supports faster project execution and lower total cost of ownership for panel upgrades and replacements.
Product Information
Extended Description
CL120 Eaton: Eaton Classified 1" thermal magnetic circuit breaker, Type CL 1-Inch classified replacement breaker, 20 A, 10 kAIC, single-pole, 120/240V, CL, #14-4 AWG Cu/Al, CL, Type CH loadcenters
Product Name
Eaton Classified 1" thermal magnetic circuit breaker
Catalog Number
CL120
UPC
786676011556
Product Length/Depth
3 in
Product Height
3 in
Product Width
1 in
Product Weight
0.3 lb
Warranty
Limited lifetime residential, 1 year commercial
Certifications
UL 489
Catalog Notes
Replacement for Square D Homeline, GE Type THQ, Crouse-Hinds Type MP, Thomas and Betts Type TB, Murray Type MP, ITE/Siemens Type QP. Requires 1-inch (25.4 mm) space.
Used with
Type CH Loadcenters
Type
Type CL 1-Inch classified replacement breaker
Amperage Rating
20 A
Voltage rating
120/240 V
Circuit breaker type
CH
Interrupt rating
10 kAIC
Main circuit breaker
CL
Wire size
#14-4 AWG Cu/Al
Number of poles
Single-pole
Standard circuit breaker catalog numbers - 5651B63SH09
Residential and Light Commercial, Load centers and Circuit Breakers, Volume 1 Tab 1
Eaton Specification Sheet - CL120
Feature: Classified 1-Inch form factor and CH Loadcenters compatibility. Impact: Enables efficient use of limited panel space and minimizes retrofit risk by preserving mounting clearances. Application: Ideal for retrofit projects in residential and light commercial panels where CH loadcenters are installed. Feature: 20 A amperage rating and 120/240 V voltage rating. Impact: Provides targeted protection for branch circuits while aligning with standard residential electrical loads, reducing nuisance trips. Application: Suitable for lighting circuits and general branch circuits in homes and small offices. Feature: 10 kAIC interrupt rating and UL 489 certification. Impact: Improves protection against high-energy faults, helping meet code requirements and safety standards. Application: Critical for service panels with higher fault currents and for panel upgrades. Feature: Cross-brand replacement capability (replacement for Square D Homeline, GE THQ, Crouse-Hinds MP, etc.). Impact: Consolidates spare parts and simplifies ordering across multiple legacy brands, reducing procurement costs. Application: Field technicians can stock fewer parts while maintaining compatibility across a mixed-panel fleet. Feature: Wire size compatibility (#14-4 AWG Cu/Al) and compact dimensions (3 in long, 3 in high, 1 in wide). Impact: Eases wiring, termination reliability, and enables quick installation in crowded panels. Application: New installs and replacements in CH Loadcenters with typical feeder and branch wiring.
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FAQs
The CL120 is designed as a Type CH loadcenter compatible, classified replacement breaker. It also serves as a cross-brand substitute for legacy panels such as Square D Homeline, GE THQ, and others, provided the panel space and rating meet 1 inch width, 20 A, and 120/240 V requirements. This versatility reduces stocking needs and downtime during upgrades.
The CL120 accepts #14-4 AWG copper or aluminum conductors, aligning with common residential wiring practices. Its 1-inch width and 3x3x1 inch footprint simplify termination in crowded panels, and the single-pole configuration keeps wiring straightforward. Ensure termination torque and conductor sizing follow the relevant NEC guidelines for reliable connections.
Yes. With a 20 A rating and 120/240 V capacity, the CL120 is appropriate for typical branch circuits in homes and small offices. Its UL 489 certification ensures code compliance, while the 10 kAIC interrupt rating provides robust protection against short-circuit faults in standard panel environments.
The CL120 carries UL 489 certification, confirming compliance with low-voltage circuit breaker standards. It is also a 1-Inch classified replacement breaker, designed to fit a broad range of legacy panel configurations. This combination supports safety, reliability, and ease of cross-brand compatibility in professional electrical installations.
Using the CL120 can reduce downtime and procurement costs by consolidating cross-brand replacements into a single part family for CH loadcenters. Its compatibility with multiple legacy panels lowers spare part inventories, speeds maintenance, and enables faster retrofits in residential or light commercial projects, delivering measurable savings over traditional, brand-specific breakers.