Eaton / Cutler-Hammer DK3350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Panel Mount
Eaton / Cutler-Hammer
DK3350
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
DK3350
Quantity
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Eaton / Cutler-Hammer DK3350 - 350A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Eaton / Cutler-Hammer DK3350 - 350A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | DK |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 10kA @ 250VDC |
| Frame Type | DK |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 250-500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs (TA350K) |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Quantity
Eaton / Cutler-Hammer DK3350 - 350A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | DK |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 10kA @ 250VDC |
| Frame Type | DK |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 250-500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs (TA350K) |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
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Description
Engineered for commercial and industrial power distribution, the Eaton DK3350 provides robust overcurrent protection for low-voltage systems. This 3-pole, 350A molded case circuit breaker belongs to the proven Series C family. This panel-mount MCCB installs into Eaton panelboards, switchboards, and motor control centers. It features a standard K-frame footprint and includes line and load lugs (TA350K) for 250-500 kcmil wire. Rated 65kAIC at 240VAC, it utilizes a fixed thermal-magnetic trip.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | DK |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 10kA @ 250VDC |
| Frame Type | DK |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 250-500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs (TA350K) |
| Standards | CSA C22.2 No. 5, HACR, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
9 answersWhat enclosures and panelboards are compatible with the DK3350?
This breaker is designed for installation in Eaton Series C panelboards, switchboards, and motor control centers. It is also backward compatible with legacy Cutler-Hammer and Westinghouse distribution equipment that accepts standard K-frame breakers.
Is this breaker a direct replacement for the Westinghouse DK3350?
Yes. Eaton acquired the Westinghouse distribution equipment line. The modern Eaton or Cutler-Hammer DK3350 is a direct, drop-in replacement for the legacy Westinghouse DK3350.
What is the difference between the DK3350 and the KD3350?
The primary difference is the maximum voltage rating. The DK3350 is rated for up to 240VAC, while the KD3350 is rated for up to 600VAC. Both share the same physical K-frame dimensions and mounting footprint.
Which lug kit is standard for this breaker, and what wire sizes does it accept?
The standard lug kit is the TA350K. It accepts aluminum or copper conductors ranging from 250 to 500 kcmil.
What is the recommended torque specification for the TA350K terminal lugs?
When using the TA350K lugs with 250 to 500 kcmil wire, the required tightening torque is 375 lb-in (42 N.m). Always verify torque values on the breaker nameplate before finalizing connections.
Can the DK3350 be reverse fed?
Yes. Eaton Series C K-frame circuit breakers with non-interchangeable thermal-magnetic trip units, such as the DK3350, are suitable for reverse feed applications.
How does the DK3350 perform in direct current applications?
It is fully rated for DC systems up to 250VDC, delivering a 10kAIC interrupting capacity. This makes it suitable for specific industrial DC control panels and battery backup systems that fall within its voltage and fault current limits.
Does the LI trip function on the DK3350 allow for field adjustments?
No. This specific model utilizes a non-interchangeable thermal-magnetic trip unit with fixed long-time and fixed instantaneous settings. Applications requiring adjustable pickup or delay settings will need a breaker equipped with an electronic trip unit, such as the 310+ series.
What safety precautions should be taken before installing or replacing this K-frame breaker?
Ensure all power sources are de-energized and locked out before installation. Verify that the interrupting rating meets or exceeds the available fault current at the line terminals. If replacing an older unit, confirm that the existing bus connections and mounting hardware are free of pitting or thermal damage.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
Total 5 star reviews: 3 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
3 reviews
- MDMichael D.Verified BuyerReviewingEaton / Cutler-Hammer DK3400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/13/26Perfect fit and fast shipping
My animal hospital had the main breaker fail. They were able to get the breaker to me in record time. Went right in and fixed the problem.
- TPThomas P.ReviewingEaton / Cutler-Hammer DK3400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/26/23Quick and on time
The service was quick and on time, no problems with the breaker.
- LFLou F.ReviewingEaton / Cutler-Hammer DK3300 - 300A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/24/20Owner
Purchasing from Superbreakers has been a great experience! It was quick and easy. The inventory was awesome. We needed some advice and your crack team of experts was very helpful! Thanks!