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Eaton / Cutler-Hammer KD3350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Unit Mount
Eaton / Cutler-Hammer
KD3350
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
KD3350
Quantity
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Eaton / Cutler-Hammer KD3350 - 350A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Eaton / Cutler-Hammer KD3350 - 350A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | KD |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | KD |
|---|---|
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Line and Load Lugs (TA350K) |
| Standards | HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Interchangeable Trip Unit |
Quantity
Eaton / Cutler-Hammer KD3350 - 350A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | KD |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | KD |
|---|---|
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Line and Load Lugs (TA350K) |
| Standards | HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Interchangeable Trip Unit |
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Description
The KD3350 is a robust 350-amp molded case circuit breaker from Eaton's trusted Series C family. Engineered for commercial and industrial applications, it features a fixed thermal and adjustable magnetic (LI) trip unit for precise overcurrent protection. This K-Frame breaker installs into Eaton panelboards, switchboards, and motor control centers. Rated at 35 kAIC at 480VAC, it includes interchangeable trip capabilities and reverse feed functionality for versatile system integration.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | KD |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | KD |
|---|---|
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Line and Load Lugs (TA350K) |
| Standards | HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Interchangeable Trip Unit |
Product FAQs
6 answersCan I adjust the trip settings on the KD3350?
Yes, while the thermal element for long-time overload protection is fixed, the magnetic instantaneous trip is adjustable. This allows panel builders to coordinate short-circuit protection with downstream devices in the electrical system.
Which electrical enclosures accommodate the KD3350?
This K-frame circuit breaker installs in Eaton Series C panelboards, switchboards, and motor control centers. The enclosure must be specifically configured for unit mount, feed-thru K-frame breakers rather than plug-on types.
What type of wire connections are standard on this 350A breaker?
The unit includes mechanical lugs on both the line and load sides that accept 250 to 500 kcmil aluminum or copper conductors. Use a calibrated torque wrench during installation to meet the torque requirements printed on the breaker faceplate.
Will an Eaton KD3350 replace an older Cutler-Hammer or Westinghouse KD3350?
Yes. Eaton acquired the Cutler-Hammer and Westinghouse distribution equipment lines. A modern Eaton KD3350 has the exact same K-frame footprint, mounting configuration, and specifications as the legacy Cutler-Hammer or Westinghouse KD3350.
Is the KD3350 approved for use in direct current systems?
Yes, alongside standard AC ratings up to 600VAC, this thermal-magnetic breaker is rated for 250VDC with a 10kA interrupting capacity. Verify your DC system fault current does not exceed 10kA before installation.
Are there specific mounting considerations for this feed-thru breaker?
Because it is a feed-thru unit mount breaker, it requires physical bolting or bracket mounting within the enclosure rather than snapping onto a bus. De-energize all upstream power before physically mounting the unit and landing the line side cables.
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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
Site is easy to use, and best pricing out there.
- 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!