Eaton CHQ140CS Thermal Magnetic Circuit Breaker - UL 489
Part Number: CHQ140CS
Quick Summary
Eaton CHQ140CS thermal magnetic circuit breaker protects electrical circuits in CH Loadcenters, delivering reliable overcurrent protection for 120/240 V systems. When downtime or nuisance trips threaten productivity, a classified replacement breaker that fits existing CH Loadcenters reduces service interruptions. UL 489 certification ensures safety and compliance, while its 3/4-inch format and 40 A rating support streamlined panel retrofits. As a CHQ classified replacement, it helps maintenance teams accelerate installation in residential and light commercial applications while minimizing surprises. This model supports 120/240 V operation, single-pole configuration, and a 10 kAIC interrupt rating for robust protection. With clamshell packaging and compatibility with Type CH Loadcenters, it simplifies stocking, ordering, and field replacement.
Product Information
Extended Description
CHQ140CS Eaton: 3/4" Thermal magnetic circuit breakers,Type CHQ 3/4-Inch classified replacement breaker clamshell pack,Clamshell pack,40 A,10 kAIC,Single-pole,120/240V,CHQ,(1) #14-8 AWG, (2) #14-10 AWG Cu/Al,Q30,CHQ,Type CH Loadcenters
Product Name
Eaton Classified 3/4" thermal magnetic circuit breaker
Catalog Number
CHQ140CS
UPC
782116630684
Product Length/Depth
7.25 in
Product Height
6.5 in
Product Width
4.48 in
Product Weight
1.96 lb
Warranty
Limited lifetime residential, 1 year commercial
Certifications
UL 489
Catalog Notes
Replacement for Square D Type QO Breakers. Requires one 3/4-inch (19.1 mm) space.
Used with
Type CH Loadcenters
Type
Type CHQ 3/4-Inch classified replacement breaker clamshell pack
Special features
Clamshell pack
Amperage Rating
40 A
Voltage rating
120/240 V
Circuit breaker type
CH
Interrupt rating
10 kAIC
Main circuit breaker
CHQ
Wire size
(2) #14-10 AWG Cu/Al (1) #14-8 AWG
Number of poles
Single-pole
Quantity
30
Standard circuit breaker catalog numbers - 5651B63SH09
Residential and Light Commercial, Load centers and Circuit Breakers, Volume 1 Tab 1
Eaton Specification Sheet - CHQ140CS
Feature → Business Impact → Application: The CHQ140CS uses a 3/4-inch footprint to save panel space and maximize busbar efficiency, enabling easier retrofits in crowded switchgear environments. This feature translates to faster, less disruptive installs in CH Loadcenters and reduces labor costs during commissioning. Application: Ideal for residential and light commercial panels where space is at a premium and quick replacements are needed. Feature → Business Impact → Application: A 40 A amperage rating paired with 120/240 V operation ensures compatibility with typical branch circuits and mixed-voltage layouts, supporting safer operation and reducing the risk of nuisance trips. Application: Useful in general purpose lighting, outlets, and small equipment circuits that require reliable protection. Feature → Business Impact → Application: 10 kAIC interrupt rating provides high fault tolerance for critical loads, lowering downtime risk and improving overall system reliability. Application: Suitable for commercial spaces with demanding startup transients. Feature → Business Impact → Application: UL 489 certification and Type CH compatibility simplify compliance documentation and enable straightforward procurement for maintenance teams. Application: Works with CH Loadcenters and replacement scenarios where QO-type breakers are being swapped in the field. Feature → Business Impact → Application: Clamshell packaging improves stock manageability and protects the product during transport, reducing handling damage and return rates. Application: Warehouse and distributor environments benefit from safer, easier packaging on security-strapped supply lines.
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FAQs
The CHQ140CS fits a 3/4-inch space within Type CH Loadcenters and is a single-pole, 40 A device rated for 120/240 V with a 10 kAIC interrupt rating. Ensure you power down the panel, remove the old breaker, and seat the CHQ140CS firmly in the bus and rail. The clamshell pack helps with handling and stock management. Verify wire sizes: (2) #14-10 AWG Cu/Al and (1) #14-8 AWG as per the spec, and re-energize only after confirming proper seating and torque requirements per manufacturer instructions.
Key specs include 40 A amperage rating, 120/240 V voltage rating, 10 kAIC interrupt rating, single-pole configuration, and CH main circuit breaker designation with CHQ as the load center compatibility. It is designed as a 3/4-inch classified replacement breaker compatible with Type CH Loadcenters and uses a clamshell pack for packaging.
Yes. CHQ140CS carries UL 489 certification, confirming it meets recognized safety and performance standards for circuit breakers. It is explicitly designed as a classified replacement for Type CH Loadcenters, providing reliable protection in residential and light commercial electrical panels while ensuring compliance with applicable safety codes.
CHQ140CS is best suited for residential panels and light commercial applications that use CH Loadcenters. It supports 120/240 V circuits, single-pole protection, and 40 A branch circuits with a 10 kAIC interrupt rating, enabling safe, efficient retrofits and replacements, especially when upgrading or substituting Square D QO breakers in compatible CH panels.
Eaton provides a limited lifetime warranty for residential use and a 1-year warranty for commercial use. Installation requires one 3/4-inch space within CH Loadcenters, with wire sizes up to (2) #14-10 AWG Cu/Al and (1) #14-8 AWG. The breaker is sold in a clamshell pack, simplifying storage and transport, and is designed for straightforward retrofits and field replacements in compliant installations.