Eaton CHF140ST CH Thermal Magnetic Circuit Breaker - UL 489

Part Number: CHF140ST
Manufacturer
Eaton
Part number
CHF140ST

Quick Summary

The Eaton CHF140ST CH thermal magnetic circuit breaker protects electrical circuits in panelboards and load centers. In demanding environments, nuisance trips and mis-sizing erode uptime and raise maintenance costs. This device is UL Listed 489 and HACR rated, with shunt trip included for rapid de-energization under control signals, and is designed for Type CH load centers. Its plug-on mounting and 40 A rating deliver reliable, code-compliant protection for lighting, motors, and small feeders in commercial and industrial panels. By aligning with Type CHF plug-on breakers, it also simplifies stocking and spares management, reducing field troubleshooting time while supporting a robust protection strategy.

Product Information

Extended Description

CHF140ST Eaton: Eaton CH thermal magnetic circuit breaker,Type CHF plug-on circuit breaker,40 A,10 kAIC,Single-pole,120/240V,CHF,Trip flag, common breaker trip,#14-2 AWG Cu/Al,CHF,Type CH Loadcenters,Shunt trip included
Product Name
Eaton CH thermal magnetic circuit breaker
Catalog Number
CHF140ST
UPC
786685708331
Product Length/Depth
2.375 in
Product Height
6 in
Product Width
3.5 in
Product Weight
0.5 lb
Warranty
Limited lifetime
Compliances
HACR Rated
Certifications
UL Listed UL 489
Used with
Type CH Loadcenters
Type
Type CHF plug-on circuit breaker
Amperage Rating
40 A
Voltage rating
120/240 V
Trip Type
Trip flag
Circuit breaker type
CHF
Shunt trip
Included
Mounting Method
Plug-on
Interrupt rating
10 kAIC
Main circuit breaker
CHF
Wire size
#14-2 AWG Cu/Al
Number of poles
Single-pole
Feature → Business Impact → Application: The CHF140ST is a 40 A, single-pole, plug-on circuit breaker with a 10 kAIC interrupt rating, enabling fast fault clearing and reduced arc energy at the point of protection. This improves panel reliability and safety for motor feeders and lighting circuits in Type CH Loadcenters. Application: ideal for low-voltage distribution panels in industrial control rooms and commercial facilities. Feature → Business Impact → Application: Shunt trip included provides remote tripping capability, enabling integrated safety interlock with building management systems and emergency shutdown routines. Application: enhances safety compliance in plant automation and critical equipment bays. Feature → Business Impact → Application: HACR rated and UL Listed UL 489 certified, delivering verified performance for air conditioning, heating, and refrigeration circuits. Application: suitable for HACR-compliant HVAC panels and energy-efficient building systems. Feature → Business Impact → Application: Type CHF plug-on design and mounting method simplify retrofit and upgrades, reducing installation time and panel downtime. Application: practical in upgrading legacy CH circuits to modern protection without full panel rewiring. Feature → Business Impact → Application: Wire size compatibility (#14-2 AWG Cu/Al) ensures secure terminations and lowers commissioning errors. Application: supports standard branch circuit wiring in commercial electrical enclosures. Feature → Business Impact → Application: Common-trip capability and 1-pole configuration streamline coordination with CH Loadcenters, improving protection alignment and diagnostic clarity. Application: enables efficient circuit protection planning in distributed control panels.

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FAQs

The CHF140ST is a Type CHF plug-on circuit breaker designed for use in Eaton Type CH Loadcenters. It fits standard CH panel configurations, enabling straightforward retrofit and expansion without rewiring.
A 10 kAIC interrupt rating indicates the breaker can safely interrupt fault currents up to 10 kiloamps at its rated voltage, reducing arc energy and improving protection for feeders and motors in commercial and industrial panels.
Yes. With a 120/240 V rating and a HACR designation, the CHF140ST is appropriate for HVAC, lighting, and related circuits in Type CH load centers, providing reliable protection for control panels and related equipment.
The CHF140ST is UL Listed UL 489 and HACR rated. These certifications confirm safety and performance within applicable electrical codes, ensuring compliance for commercial and industrial installations and smoother inspection processes.
The CHF140ST’s plug-on design, shunt trip option, and common-trip capability minimize installation time, reduce downtime during upgrades, and improve system reliability. Its 40 A rating and 10 kAIC protection help prevent costly outages in critical feeders, delivering tangible return on investment over time.