Eaton CHF120ST Circuit Breaker - UL 489, Shunt Trip
Part Number: CHF120ST
Quick Summary
The Eaton CHF120ST circuit breaker protects electrical circuits in distribution panels and equipment. When nuisance trips or improper protection threaten uptime, engineers need a compact, reliable solution that fits a tight panel footprint. The device carries UL 489 certification, HACR rating for motor loads, and Switching Duty Rated performance, supporting safe operation across commercial and light industrial applications. It is designed for Type CH loadcenters and offers a 3/4-inch standard frame, 120/240 V operation, and a 20 A rating, making retrofit straightforward. With a shunt-trip option and clear trip indication, it simplifies remote safety controls and fast fault diagnosis, delivering predictable protection and lower maintenance costs for your system.
Product Information
Extended Description
CHF120ST Eaton: Eaton Type CHF 3/4-inch Standard Circuit Breaker, Single-Pole, 20A, 120/240V, 10 kAIC, (1) #14-8, (2) #14-10 AWG Cu/Al 60°C or 75°C, Shunt Trip
Product Name
Eaton CH thermal magnetic circuit breaker
Catalog Number
CHF120ST
UPC
786685384818
Product Length/Depth
4.8 in
Product Height
3.5 in
Product Width
3.5 in
Product Weight
0.55 lb
Warranty
Limited lifetime residential, 1 year commercial
Certifications
UL 489
Catalog Notes
Switching Duty Rated, HACR Rated, Single-Pole Requires One 2/4-Inch Space, With Trip Indication.
Used with
Type CH Loadcenters
Type
Type CHF 3/4-inch Standard Circuit Breaker
Special features
Shunt Trip
Amperage Rating
20 A
Voltage rating
120/240 V
Interrupt rating
10 kAIC
Main circuit breaker
CH
Wire size
(1) #14-8 AWG (2) #14-10 AWG Cu/Al
Number of poles
Single-pole
Residential and Light Commercial, Metering Products, Volume 1 Tab 4
Eaton Specification Sheet - CHF120ST
Eaton type CH circuit breaker limited warranty June 2024
Feature: 20 A, 120/240 V thermal-magnetic breaker with a 10 kAIC interrupt rating. Business Impact: Provides robust short-circuit protection while minimizing nuisance trips, reducing downtime and extending equipment life. Application: Ideal for Type CH loadcenters in commercial and light industrial panels, delivering reliable protection for general-purpose circuits. Long-tail keyword integration: 20 A circuit breaker, Type CH, 120/240 V, 10 kAIC. Feature: Shunt Trip option. Business Impact: Enables remote or interlock-triggered tripping for enhanced safety and compliance with safety interlock systems. Application: Remote safety control in manufacturing lines and safe shutdown scenarios; supports HACR-rated motor protection in complex control schemes. Long-tail keyword: shunt-trip circuit breaker, remote trip option. Feature: Single-pole design occupying one space. Business Impact: Maximizes panel density and minimizes enclosure footprint, reducing cabinet costs and simplifying wiring layouts. Application: Residential and light commercial panels where space is limited; compatible with Type CH Loadcenters. Long-tail keyword: single-pole circuit breaker, 1-space installation. Feature: Wire size compatibility. Business Impact: Streamlines procurement with standard Cu/Al conductors (#14-8 and #14-10) and reduces field modification time. Application: Easy integration in existing panels without rewiring or adaptors. Long-tail keyword: #14-8 Cu/Al, #14-10 Cu/Al. Feature: Trip indication. Business Impact: Quick fault diagnosis saves service time and improves maintenance planning. Application: Field service and routine inspections; immediate visual feedback aids safety. Long-tail keyword: trip indication feature. Feature: Certifications and ratings. Business Impact: Ensures code compliance and safe operation across installations, reducing regulatory risk. Application: Commercial buildings and light industrial facilities requiring UL 489 and HACR-rated devices. Long-tail keyword: UL 489 certified, HACR rated, Switching Duty Rated.
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FAQs
The CHF120ST is a single-pole 20 A, 120/240 V, 10 kAIC thermal-magnetic circuit breaker designed for Type CH loadcenters. It fits a standard CHF 3/4-inch frame, occupies one pole and one space, and accepts copper or aluminum conductors #14-8 and #14-10. Trip indication supports quick diagnostics, and the shunt-trip option enables remote safety control in compatible systems.
The shunt-trip option allows remote or interlock-triggered tripping, enabling rapid de-energization of a circuit for machine safety and emergency shutdowns. This integrates with safety interlocks and control circuits while preserving HACR-rated motor protection. It also enhances compliance with safety standards, reducing exposure to hazards during faults in industrial environments.
Yes. The CHF120ST is UL 489 certified, and catalog notes confirm HACR-rated capability for motor loads. It is also Switching Duty Rated, ensuring reliable interruption under real-world switching conditions. This combination supports code compliance in commercial and light industrial installations while maintaining compatibility with Type CH loadcenters.
Consider space requirements: single-pole devices occupy one 2/4-inch space in a CH loadcenter. It accepts one #14-8 Cu/Al conductor and two #14-10 Cu/Al conductors, 60°C or 75°C rated. Use the trip indication for maintenance, and if using a remote trip, ensure shunt-trip wiring meets control-circuit standards and local codes.
Eaton provides a limited lifetime warranty for residential use and a 1-year warranty for commercial applications. The CHF120ST’s durable thermal-magnetic design minimizes nuisance trips, reduces wear, and lowers maintenance costs. Its UL certification and CH-loadcenter compatibility support predictable ROI in panel upgrades and new installations.