Eaton / Cutler-Hammer HKD3400X15 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Panel Mount
Eaton / Cutler-Hammer
HKD3400X15
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
HKD3400X15
Quantity
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Eaton / Cutler-Hammer HKD3400X15 - 400A 3 Pole Molded Case Circuit Breaker
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Description
Delivering reliable thermal-magnetic (LI) protection, the HKD3400X15 is a 400A, three-pole MCCB from Eaton. It is built to handle the rigorous demands of commercial power systems. This K-frame model installs into Series C panelboards and switchboards. The "X15" suffix denotes a factory configuration that includes load-side lugs (3TA401K), streamlining installation. Capable of interrupting 65 kAIC at 480VAC, it provides exceptional fault-clearing performance and features reverse feed capability.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HKD3400X15 |
| Series | HKD |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 22kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 2/0 AWG - 500 kcmil (1 conductor) or 2/0 AWG - 250 kcmil (2 conductors) (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included (3TA401K) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed, Interchangeable Trip Unit |
Product FAQs
6 answersWhat does the X15 suffix indicate on the HKD3400X15?
The X15 suffix indicates a factory configuration designed for panelboard installation. It includes standard mechanical lugs on the load side, while the line side is left without lugs for direct connection to the busbar.
What wire sizes are accepted by the load lugs on this breaker?
The load-side lugs accept either one 2/0 AWG to 500 kcmil conductor or two 2/0 AWG to 250 kcmil conductors per phase. They are rated for use with both copper and aluminum wiring.
Can the HKD3400X15 replace a standard KD3400 breaker?
Yes, the HKD is the high-interrupting version of the standard KD frame. Both are Series C K-frame breakers with identical physical dimensions, making the HKD3400X15 a direct drop-in replacement that provides a higher short-circuit rating.
Is the trip unit on the HKD3400X15 fully adjustable?
The thermal element for long-time protection is fixed at 400 amps, but the magnetic instantaneous trip is adjustable. This allows electricians to fine-tune the short-circuit response to coordinate with downstream devices and prevent nuisance tripping from motor inrush currents.
Which enclosures and panelboards are compatible with this breaker?
The HKD3400X15 is designed for use in Eaton and Cutler-Hammer Series C panelboards, switchboards, and motor control centers that are configured to accept K-frame circuit breakers.
Does this breaker include ground fault protection?
No, the HKD3400X15 features an LI (Long-Time, Instantaneous) trip unit, which does not include ground fault protection. If ground fault monitoring is required, a breaker with an LSG or LSIG trip unit must be used.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 4 reviews.
Total 5 star reviews: 4 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
4 reviews
- ASAaron S.Verified BuyerReviewingEaton / Cutler-Hammer HKD3400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/13/26Worked as advertised
Don't forget the lug kit if needed
- LHLarry H.Verified BuyerReviewingEaton / Cutler-Hammer HKD3200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/19/25It was great
New breaker
- CSCatherine S.ReviewingEaton / Cutler-Hammer HKD3400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/24/22Great
Great Service / Prompt Delivery
- FSFrank S.ReviewingEaton / Cutler-Hammer HKD3400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars10/23/17Breaker purchase
Purchased breaker at a great price, was in stock and shipped it out right away. Will shop at this site again in the future.