Eaton / Cutler-Hammer CH120ST Miniature Circuit Breaker
- 20A
- 1 Pole
- Plug-On
Quantity
Eaton / Cutler-Hammer CH120ST - 20A 1 Pole Miniature Circuit Breaker
New
Quantity
Description
Built for applications requiring remote shutdown capabilities, this 20A single-pole breaker integrates a factory-installed shunt trip mechanism. It fits standard 3/4-inch spaces in Eaton Type CH load centers, providing reliable thermal-magnetic protection for commercial and industrial circuits. The unit carries a 10kAIC rating and is SWD approved for switching fluorescent lighting loads. Note that this specific model has been superseded by the newer CHF120ST series with trip flag indication.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | CH120ST |
| Series | CH |
| 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 Load Centers |
| Wire Gauge | (1) 14-8 AWG (Cu/Al), (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, SWD, UL 489 |
| Approval | UL |
| Temp Rating | 60C to 75C |
| Construction Features | HACR Rated, SWD Rated |
Product FAQs
7 answersHow much panel space does the CH120ST require in a Type CH load center?
Although it is a 1-pole breaker, the factory-installed shunt trip mechanism requires one additional pole space. Therefore, the CH120ST requires two 3/4-inch spaces in an Eaton Type CH load center.
What does the ST suffix indicate on the CH120ST breaker?
The ST suffix indicates that this breaker includes a factory-installed shunt trip mechanism. This allows the breaker to be tripped remotely via an external voltage signal, which is commonly used for emergency shutdown applications.
Has the CH120ST been superseded by a newer model?
Yes, the CH120ST has been superseded by the newer CHF120ST series. The CHF version includes a mechanical trip flag indicator to easily differentiate between a tripped condition and the breaker being manually turned off.
How does the thermal-magnetic trip mechanism operate on this breaker?
The thermal element prevents nuisance tripping on mild overloads by using an inverse time delay, while the magnetic element reacts almost instantaneously to severe short-circuit conditions to protect the circuit.
Can I install this breaker in a standard 1-inch load center?
No, this breaker is specifically designed for Eaton Type CH load centers, which utilize a 3/4-inch spacing format. It will not fit in panels designed for 1-inch breakers, such as Eaton Type BR.
Is the CH120ST rated for switching duty?
Yes, this breaker is SWD rated, meaning it is approved for switching fluorescent lighting loads on a regular basis without damaging the breaker mechanism.
Is this breaker HACR rated for HVAC applications?
Yes, it is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment that requires this specific circuit protection rating.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 74 reviews.
- JGJason G.Verified BuyerReviewingEaton / Cutler-Hammer CH220GFI - 20A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/24/26It was as advertised
It was delivered on time and works.
- LGlarry g.Verified BuyerReviewingEaton / Cutler-Hammer CH335 - 35A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/20/26good
Great part quick shipping
- PLPhid L.Verified BuyerReviewingEaton / Cutler-Hammer CH230GFI - 30A GFCI Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/7/26EFFICIENT
BREAKER ARRIVED QUICKLY. WELL PACKAGED FOR PROTECTION.
- CSChristine S.Verified BuyerReviewingEaton / Cutler-Hammer CH2100-LONG - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/18/26Got a great refurbished breaker - saved a $6500 Service Replacement
When our main breaker frizzed out, the option we were presented with was replacing the entire panel and service due to the type and part - no longer produced for replacement parts. It would be a $6500 replacement.
We'll likely have to do it at some point but, for now, the replacement breaker we were able to source from Superbreakers (with a $25 warranty) was $5900 less expensive. installation ran a few hundred dollars and the tech said the part looked to be in excellent condition and was prepped for install as he would have hoped.
Very thankful for SuperBreakers!
- MKMichael K.Verified BuyerReviewingEaton / Cutler-Hammer CH330 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars4/22/26Happy Customer
Arrived as described and in the timeframe