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Eaton / Cutler-Hammer CH2125ST Miniature Circuit Breaker
- 125A
- 2 Pole
- Plug-On
Eaton / Cutler-Hammer
CH2125ST
Miniature Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
CH2125ST
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Eaton / Cutler-Hammer CH2125ST - 125A 2 Pole Miniature Circuit Breaker
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Description
Integrating remote shutdown capabilities, the Eaton CH2125ST is a 125A, two-pole miniature circuit breaker. It is engineered for commercial environments requiring automated circuit interruption. This unit mounts into standard Eaton Type CH load centers. Delivering a 10 kAIC interrupting rating at 120/240V, it utilizes thermal-magnetic technology for standard overcurrent protection. The breaker features a factory-installed shunt trip and is HACR rated for HVAC systems.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | CH2125ST |
| Series | CH |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | CH |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Eaton CH Load Centers |
| Wire Gauge | 10-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 10 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | UL 489, CSA C22.2 No. 5, HACR |
| Approval | UL, CSA |
| Temp Rating | 60C to 75C |
| Construction Features | Common Trip, HACR Rated |
Product FAQs
7 answersCan I install the CH2125ST in an older Cutler-Hammer panel?
Yes. Eaton acquired Cutler-Hammer, and their CH series product lines are identical. This breaker is fully compatible with legacy Cutler-Hammer CH load centers.
What does the ST suffix indicate on the CH2125ST?
The ST designates a factory-installed shunt trip. This allows the breaker to be tripped remotely when a voltage signal is applied to the shunt trip coil, which is commonly used for emergency stops or automated safety shutdowns.
Are the terminals on this breaker rated for aluminum wiring?
Yes, the box lugs are dual-rated for both copper and aluminum conductors. They accept wire sizes ranging from 10 AWG up to 1/0 AWG.
Can this 125A breaker be used as a main breaker?
Yes, depending on the load center design, a 125A 2-pole CH breaker can serve as a main breaker or as a high-capacity branch breaker for subpanels and large equipment.
What type of protection does the thermal magnetic trip provide?
It provides two layers of protection. The thermal element trips on prolonged, mild overloads to prevent overheating, while the magnetic element trips instantaneously during severe short circuits.
Will this breaker fit in an Eaton BR series load center?
No. The CH2125ST is a 3/4-inch format breaker designed exclusively for Eaton CH load centers. It is not interchangeable with the 1-inch BR series or panels from other manufacturers.
Does this 2-pole breaker feature an internal common trip?
Yes, it features an internal common trip mechanism. If an overcurrent or short circuit occurs on either leg, both poles will trip simultaneously to completely disconnect power to the circuit.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 74 reviews.
Total 5 star reviews: 72 Total 4 star reviews: 2 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 8/5/25
Customers say these electrical breakers are readily available when hard to find elsewhere. Many reviews mention fast shipping and accurate order fulfillment. Common feedback includes competitive pricing and proper packaging. Reviews note the products fit correctly and match specifications. While most highlight quick delivery times, some mention occasional supply delays. The ordering process receives praise for its simplicity.
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Rating
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