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Eaton / Cutler-Hammer KDC3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Panel Mount
Eaton / Cutler-Hammer
KDC3125
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
KDC3125
Quantity
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Eaton / Cutler-Hammer KDC3125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Designed for commercial power distribution, the Eaton KDC3125 is a 3-pole, 125A molded case circuit breaker. It features a robust thermal-magnetic trip unit offering fixed thermal and adjustable magnetic settings. This K-Frame breaker fits Eaton Series C panelboards, switchboards, and industrial motor control centers. It comes standard with TA300K lugs supporting 3 AWG through 350 kcmil conductors. Capable of interrupting 200 kAIC at 240V, it is HACR rated and allows for reverse feeding.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | KDC |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | K |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 3 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 3 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, Motor Operator |
|---|---|
| Accessories | Line and Load Lugs Included (TA300K) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | ABS, CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Reverse Feed, Interchangeable Trip Unit, Trip-Free Mechanism, Visual Trip Indicator |
Product FAQs
7 answersWhat is the difference between the KD, HKD, and KDC circuit breakers?
The prefix indicates the interrupting capacity of the breaker. The KDC is the ultra-high interrupting capacity version, rated at 200 kAIC at 240V and 100 kAIC at 480V. Standard KD breakers are rated at 65 kAIC at 240V, and HKD breakers are rated at 100 kAIC at 240V.
Can the Eaton KDC3125 replace an older Westinghouse KDC3125?
Yes. Eaton acquired the Westinghouse distribution equipment line and continues to manufacture these breakers under the Eaton and Cutler-Hammer brands. The Eaton KDC3125 is a direct replacement for legacy Westinghouse and Cutler-Hammer breakers with the exact same catalog number.
What types of enclosures and equipment are compatible with the KDC3125?
This K-Frame breaker is designed for use in Eaton Series C panelboards, switchboards, motor control centers, and busway applications.
Are internal accessories field-installable on the KDC3125?
Yes, Series C K-Frame breakers support field-installable internal accessories. Components like shunt trips, auxiliary switches, and undervoltage releases can typically be mounted in the left or right pole of the breaker.
What does the LI trip function code mean on this breaker?
The LI designation indicates that the thermal magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The long-time function protects against sustained overloads, while the instantaneous function provides immediate tripping during short-circuit faults.
How is the magnetic trip adjusted on the KDC3125?
The KDC3125 features a fixed thermal and adjustable magnetic trip unit. The magnetic (instantaneous) trip settings can be adjusted in the field using the dials located on the front face of the breaker to coordinate with your specific system fault levels.
Does this breaker mount onto standard DIN rail?
No, the KDC3125 is a panel mount, feed-thru molded case circuit breaker. It is designed to be bolted directly into compatible panelboards or switchboards, not snapped onto a DIN rail.
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