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Eaton / Cutler-Hammer CH340 Miniature Circuit Breaker
- 40A
- 3 Pole
- Plug-On
Eaton / Cutler-Hammer
CH340
Miniature Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
CH340
Quantity
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Eaton / Cutler-Hammer CH340 - 40A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Eaton / Cutler-Hammer CH340 - 40A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | CH340 |
| Series | CH |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Type 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 |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, UL |
| Temp Rating | 60C to 75C |
| Construction Features | HACR Rated, Common Trip |
Sold out
Quantity
Eaton / Cutler-Hammer CH340 - 40A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | CH340-R |
| Series | CH |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Type 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 |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, UL |
| Temp Rating | 60C to 75C |
| Construction Features | HACR Rated, Common Trip |
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Description
Engineered for commercial and industrial environments, this 40-amp miniature circuit breaker provides reliable overcurrent protection. It features a standard 10kA interrupt rating at 240VAC and carries an HACR certification for heating and cooling equipment. The unit mounts into Eaton and Cutler-Hammer Type CH load centers. It utilizes a 3/4-inch per pole format, requiring three spaces within the panelboard chassis. A common trip mechanism ensures all three phases disconnect simultaneously.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | CH340 |
| Series | CH |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | Type 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 |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489, HACR |
| Approval | CSA, UL |
| Temp Rating | 60C to 75C |
| Construction Features | HACR Rated, Common Trip |
Product FAQs
6 answersCan I install the CH340 in an Eaton BR or standard 1-inch load center?
No. The CH340 is designed exclusively for Eaton and legacy Cutler-Hammer Type CH load centers. It utilizes a 3/4-inch per pole format and will not seat onto the bus of standard 1-inch panels like the BR series.
How much panel space does the CH340 require?
As a 3-pole CH series breaker, it requires three 3/4-inch spaces, occupying a total width of 2.25 inches on the panel interior.
Is the CH340 approved for HVAC equipment?
Yes, the CH340 is HACR rated, making it fully approved for heating, air conditioning, and refrigeration applications that require overcurrent protection.
Can I use this to replace an older Cutler-Hammer CH340 breaker?
Yes. Eaton acquired Cutler-Hammer and continues to manufacture the CH series. The modern Eaton CH340 is the exact, UL listed direct replacement for legacy Cutler-Hammer CH340 breakers.
Does this 3-pole breaker feature a common trip?
Yes, the CH340 utilizes an internal common trip mechanism. A fault or overload on any single phase will mechanically force all three poles to open simultaneously, preventing single-phasing of motors or equipment.
How does the CH340 visually indicate a tripped condition?
Standard Eaton Type CH circuit breakers are engineered to trip directly to the OFF position, unlike many other breakers that stop in a center position. This clearly shows the breaker status and streamlines the reset process.
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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.
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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