Eaton / Cutler-Hammer HKDDC3350W Molded Case Circuit Breaker
- 350A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer HKDDC3350W - 350A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed specifically for photovoltaic and heavy-duty DC systems, the Eaton HKDDC3350W is a 350A, 3-pole Series C breaker. It provides reliable thermal-magnetic protection for commercial solar arrays, data centers, and industrial facilities. This K-Frame unit mounts into compatible Eaton panelboards and switchboards. The 'W' suffix indicates it is supplied without terminals, allowing contractors to select specific lugs. With a 42kAIC rating at 600VDC, this MCCB ensures superior fault clearing.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | HKDDC |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 125VDC, 250VDC, 600VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 125VDC, 50kA @ 250VDC, 42kA @ 600VDC |
| Frame Type | HKD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| 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, Terminal Shields |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | DC Rated, High Interrupting Capacity, PV Guard |
Product FAQs
8 answersDoes the HKDDC3350W come with terminal lugs?
No. The W suffix in the catalog number indicates that this breaker is supplied without terminals. You must source the appropriate line and load lugs separately based on your specific conductor size and material.
Can this 3-pole breaker be used in 2-pole DC circuits?
Yes. A 3-pole DC breaker like the HKDDC3350W can be wired for 2-pole applications. In many ungrounded or grounded DC systems, multiple poles are connected in series to meet the required voltage and interruption ratings. Always refer to Eaton wiring diagrams for proper series connections.
What applications are suitable for the HKDDC3350W?
This breaker is specifically designed for heavy-duty DC applications. It is frequently installed in commercial photovoltaic (solar) systems, data center power distributions, and industrial DC networks that require reliable thermal magnetic protection up to 600VDC.
Are the trip settings adjustable on this breaker?
The HKDDC3350W features a thermal magnetic trip unit with a fixed thermal setting for overload protection and an adjustable magnetic setting for short-circuit protection. This allows you to fine-tune the instantaneous trip response based on your system requirements.
How do I manually exercise the trip mechanism?
You can verify the mechanical operation of the breaker by using the push-to-trip button on the front of the trip unit. Pressing this button with a small screwdriver will manually trip the breaker, allowing you to exercise the mechanism during routine maintenance.
What is the reset procedure after a thermal trip?
If the breaker trips due to a thermal overload, the internal thermal element must be allowed to cool before the mechanism can be reset. Always investigate and resolve the root cause of the overcurrent condition before re-energizing the circuit.
What precautions are needed when terminating aluminum conductors?
If you are using aluminum wiring with your separately purchased lugs, you must apply a suitable joint compound to the conductors. This prevents oxidation and terminal overheating, which can lead to nuisance tripping or permanent damage to the breaker.
What enclosures and panelboards are compatible with this breaker?
As a K-Frame device, the HKDDC3350W is designed to mount in Eaton Series C panelboards, switchboards, and motor control centers that are configured to accept K-Frame molded case circuit breakers.
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