Eaton / Cutler-Hammer CHF120ST Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Quantity
Eaton / Cutler-Hammer CHF120ST - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Providing reliable overcurrent protection alongside remote shut-off functionality, this 20-amp single-pole breaker features a built-in 120V shunt trip. It installs quickly into Eaton Type CH load centers, occupying a standard 3/4-inch space. The device incorporates a highly visible trip indicator flag for rapid troubleshooting, and carries both HACR and SWD ratings, making it suitable for air conditioning systems and standard switching duties.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | CHF120ST |
| Series | CHF |
| Amperage | 20A |
| Poles | 1 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | CH |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Type CH Loadcenters |
| Wire Gauge | (1) 14-8 AWG (Cu/Al) or (2) 14-10 AWG (Cu/Al) |
| Max Wire | 8 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment, Handle Lock |
|---|---|
| Accessories | Shunt Trip |
| Standards | HACR, UL 489 |
| Approval | UL |
| Temp Rating | 60C to 75C |
| Construction Features | Visual Trip Indicator, HACR Rated, SWD Rated |
Product FAQs
8 answersWhat panels accept the Eaton CHF120ST circuit breaker?
This 3/4-inch plug-on breaker is exclusively compatible with Eaton and Cutler-Hammer Type CH loadcenters. It will not fit in Type BR or other 1-inch panel designs.
What is the purpose of the shunt trip on the CHF120ST?
The built-in 120V shunt trip allows the breaker to be opened remotely via an external voltage signal. This is commonly used for emergency stops, fire alarm integration, or automated equipment disconnects.
What wire sizes and types are approved for the CHF120ST terminals?
The box lugs accept a single 14 to 8 AWG copper or aluminum conductor, or two 14 to 10 AWG copper or aluminum conductors.
What is the temperature rating for conductors connected to this breaker?
The terminals are rated for use with 60°C or 75°C copper or aluminum wire.
How does the trip flag function on the CHF series breakers?
The CHF120ST features a mechanical trip indicator flag that provides a clear visual distinction between a breaker that has tripped due to a fault and one that has been manually switched to the OFF position.
How does the thermal-magnetic trip mechanism operate on this breaker?
The fixed long-time and instantaneous (LI) trip functions use a bimetallic strip to delay tripping on mild overloads, preventing nuisance trips, while the magnetic element reacts immediately to severe short-circuit faults.
Is the CHF120ST rated for switching duty and HVAC applications?
Yes, it carries both SWD (Switching Duty) and HACR ratings, making it suitable for switching 120V fluorescent lighting loads and protecting heating, air conditioning, and refrigeration equipment.
What is the UPC for the Eaton CHF120ST?
The standard UPC for this shunt trip breaker is 786685384818.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 45 reviews.
- JMjim m.Verified BuyerReviewingEaton / Cutler-Hammer CHF120ST - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars4/6/26Shunt trip
Perfect for the ansul hood suppression shutdown.
- CWCody W.Verified BuyerReviewingEaton / Cutler-Hammer CHF250 - 50A 2 Pole Miniature Circuit BreakerI do not recommend this productRated 1 out of 5 stars2/10/26Product is fine but customer service is not great!
I needed these breakers for an install - first time using the company. They said they had them in stock. Took over a week to fulfil the order and it was 11 or 12 days before I had my hands on them. Tough on my business. Then when I went return them they hit me with so many fees that I was gonna net under $30 on a $104 order. It's too bad this was my first experience with them. I'll be sure to tell my electricians and project managers to never use this company. Short sighted. They won the battle but lost the war with a potential great long term client.
- JOJoseph O.ReviewingEaton / Cutler-Hammer CHFCAF120 - 20A AFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars10/30/22A++;
A++;
- JRJoseph R.ReviewingEaton / Cutler-Hammer CHFAFGF120 - 20A Dual Function Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/8/22Just as described
Quick turnaround, right fit
- RBRay B.ReviewingEaton / Cutler-Hammer CHFGFT120PN - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars2/24/22Great price and inventory
Looking for a hard to find part, these guys have it. Shopping was fast and easy. Part arrive faster than expected. Will be my go to for breakers!