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Eaton / Cutler-Hammer DK3400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Eaton / Cutler-Hammer
DK3400
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
DK3400
Quantity
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Eaton / Cutler-Hammer DK3400 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Eaton / Cutler-Hammer DK3400 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | DK3400 |
| Series | DK |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Motor Control Centers, Switchboards |
| Wire Gauge | (2) 3/0 AWG - 250 kcmil (Al/Cu) |
| Max Wire | 250 kcmil |
| Min Wire | 3/0 AWG |
| 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 |
|---|---|
| Accessories | Line and Load Lugs Included |
| 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 DK3400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | DK3400-R |
| Series | DK |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Motor Control Centers, Switchboards |
| Wire Gauge | (2) 3/0 AWG - 250 kcmil (Al/Cu) |
| Max Wire | 250 kcmil |
| Min Wire | 3/0 AWG |
| 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 |
|---|---|
| Accessories | Line and Load Lugs Included |
| 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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400A 3 Pole Molded Case Circuit Breaker
400A 3 Pole Molded Case Circuit Breaker
Description
Engineered for heavy-duty power distribution, the DK3400 is a 400A, 3-pole MCCB from Eaton's Series C K-Frame family. It utilizes a fixed thermal-magnetic trip unit to deliver precise long-time and instantaneous (LI) protection. Designed for unit mounting within Eaton switchboards and motor control centers, it includes line and load lugs for dual 3/0 AWG to 250 kcmil conductors. With a 65kAIC rating at 240VAC, this HACR-rated breaker safely handles significant commercial fault currents.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | DK3400 |
| Series | DK |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Motor Control Centers, Switchboards |
| Wire Gauge | (2) 3/0 AWG - 250 kcmil (Al/Cu) |
| Max Wire | 250 kcmil |
| Min Wire | 3/0 AWG |
| 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 |
|---|---|
| Accessories | Line and Load Lugs Included |
| 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
5 answersWhat wire dimensions and materials are the factory lugs rated for on this breaker?
The standard terminal lugs are designed to accommodate two 3/0 AWG to 250 kcmil conductors per phase. They are dual-rated for either aluminum or copper wire.
Where can I install this Series C circuit breaker?
The DK3400 is a unit-mount circuit breaker engineered for use in Eaton Series C panelboards, motor control centers, and switchboard environments.
Is the trip unit on the DK3400 adjustable?
No. This breaker is equipped with a thermal-magnetic trip unit that features fixed long-time (thermal) and fixed instantaneous (magnetic) trip points.
Is this circuit breaker rated for use in direct current systems?
Yes. It carries a 250 VDC rating with a 10 kAIC interrupting capacity, allowing it to be integrated into supported DC distribution and control applications.
Will this fit as a replacement for an older Cutler-Hammer DK3400?
Yes. Eaton manufactures this Series C breaker under both the Eaton and Cutler-Hammer brands. It is a direct physical and electrical replacement for legacy Cutler-Hammer breakers sharing the exact same catalog number.
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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!