Eaton / Cutler-Hammer CH320ST Miniature Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Quantity
Eaton / Cutler-Hammer CH320ST - 20A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Designed for commercial and industrial applications requiring remote shutdown capabilities, this three-pole 20A device features an integrated shunt trip mechanism. The thermal-magnetic trip unit provides reliable long-time and instantaneous protection for 240V circuits. It installs into standard Eaton Type CH load centers, utilizing the classic 3/4-inch per pole footprint. The box lug terminals accept 14-6 AWG copper or aluminum wiring for flexible installation.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | CH320ST |
| Series | CH |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | CH |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Eaton CH Load Centers |
| Wire Gauge | 14-6 AWG (Cu/Al) |
| Max Wire | 6 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 | CSA C22.2, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 60C to 75C |
| Construction Features | Common Trip, HACR Rated |
Product FAQs
5 answersHow many panel spaces does the CH320ST require?
Although it is a 3-pole breaker, the integrated shunt trip requires one additional 3/4-inch pole space. It will occupy a total of four spaces in a compatible Eaton CH load center.
What does the ST suffix indicate in the catalog number?
The ST suffix means the breaker is equipped with a factory-installed shunt trip. This feature allows the breaker to be tripped remotely, which is frequently required for emergency equipment shutdown.
How does the common trip mechanism function on this model?
The thermal-magnetic trip unit features an internal common trip connection. If an overload or short circuit occurs on any single phase, the mechanism ensures all three poles open simultaneously to protect connected equipment from single-phasing damage.
Can the CH320ST be installed in marine or IT environments?
Yes, this breaker is approved for specialized applications beyond standard commercial use. It is suitable for marine vessels, renewable energy generation, and IT spaces such as hyper-converged data centers.
How do you identify a tripped CH320ST breaker?
Eaton CH series breakers are designed to trip directly to the OFF position rather than a middle position. This makes it easy to visually identify a tripped circuit and simplifies the reset process.
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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