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Eaton / Cutler-Hammer KD3400N Molded Case Circuit Breaker
- 400A
- 3 Pole
- Panel Mount
Eaton / Cutler-Hammer
KD3400N
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
KD3400N
Quantity
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Eaton / Cutler-Hammer KD3400N - 400A 3 Pole Molded Case Circuit Breaker
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Description
Designed to handle demanding electrical loads, this 3-pole molded case breaker delivers reliable 35kAIC overcurrent protection at 480V. It mounts into Pow-R-Line 3a and 4 panelboards, offering a seamless fit for facility upgrades. Equipped with fixed thermal and magnetic trip settings, the HACR-rated unit supports reverse feed applications and provides essential safety for commercial power systems.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | KD3400N |
| Series | KD |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Pow-R-Line 3a Panelboards, Pow-R-Line 4 Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 3/0 AWG - 250 kcmil (Al/Cu) or (1) 250-500 kcmil (Al/Cu) |
| Max Wire | 500 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 | Auxiliary Switch, Shunt Trip, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs Included |
| 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 |
Product FAQs
9 answersWhat panelboards and enclosures accept the KD3400N breaker?
This K-frame breaker installs in Eaton Series C panelboards, Pow-R-Line 3a and 4 panelboards, as well as compatible switchboards and motor control centers. It requires K-frame specific mounting hardware or strap kits depending on the exact chassis.
What wire sizes do the standard lugs on the KD3400N accept?
The factory lugs (part number 3TA400K) accept either two 3/0 AWG to 250 kcmil aluminum or copper conductors, or a single 250 to 500 kcmil aluminum or copper conductor per phase.
Can the KD3400N be used in DC power systems?
Yes, this breaker is rated for DC applications up to 250VDC with a 10kA interrupting capacity. It is suitable for specific industrial DC control panels and battery systems.
Can the Eaton KD3400N replace older Westinghouse KD breakers?
Yes, Eaton acquired the Cutler-Hammer and Westinghouse molded case circuit breaker lines. The KD3400N is a direct, drop-in replacement for legacy Westinghouse and Cutler-Hammer KD3400N breakers with identical physical dimensions and mounting.
Is the KD3400N suitable for reverse feed applications?
Yes, the KD3400N thermal-magnetic circuit breaker does not have line and load side restrictions and can be reverse fed safely in commercial and industrial power systems.
What does the LI trip function mean on the KD3400N?
The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) overload protection and Instantaneous (I) short-circuit protection. Both the thermal and magnetic trip settings are fixed on this specific model.
Can I install field accessories like a shunt trip or auxiliary switch on the KD3400N?
Yes, the Series C K-frame supports internal accessories including shunt trips, undervoltage releases, auxiliary switches, and alarm switches. These are typically installed in the accessory pockets under the front cover.
Is the KD3400N rated for HVAC applications?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires a dedicated circuit breaker for group motor protection.
What is the difference between the KD3400N and the KD3400F?
The KD3400N is a complete, fully assembled circuit breaker that includes both the frame and the fixed thermal-magnetic trip unit. The KD3400F refers only to the breaker frame, which requires a separate trip unit to be installed before use.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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2 reviews
- CMCorbett M.Rated 5 out of 5 stars5/25/21Great pricing
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- JPJob# P.Rated 5 out of 5 stars2/13/18Denis M. Fortino VP Premium Electric Corp.
Superbreakers provides outstanding service. My thanks to Javier for tech support!