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Eaton / Cutler-Hammer HKA3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Eaton / Cutler-Hammer
HKA3125
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
HKA3125
Quantity
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Eaton / Cutler-Hammer HKA3125 - 125A 3 Pole Molded Case Circuit Breaker
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Eaton / Cutler-Hammer HKA3125 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HKA3125 |
| Series | HKA |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Eaton Pow-R-Line C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 350 kcmil (Cu/Al) |
| Max Wire | 350 kcmil |
| Min Wire | 4 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5.1, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Mark 75, High Interrupting Capacity, Interchangeable Trip, HACR Rated |
Quantity
Eaton / Cutler-Hammer HKA3125 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HKA3125-R |
| Series | HKA |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Eaton Pow-R-Line C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 350 kcmil (Cu/Al) |
| Max Wire | 350 kcmil |
| Min Wire | 4 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5.1, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Mark 75, High Interrupting Capacity, Interchangeable Trip, HACR Rated |
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Description
Designed to accommodate precise coordination needs, this 125A K-Frame circuit breaker includes an adjustable magnetic trip mechanism. The bolt-on unit installs into legacy Westinghouse enclosures as well as Eaton Pow-R-Line C panelboards and motor control centers. Operating with a 35kAIC capacity at 480VAC, the Mark 75 series component delivers reliable long-time and instantaneous protection. For modern retrofits, this model is officially replaced by the KD3125 or HKD3125 alternatives.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HKA3125 |
| Series | HKA |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Eaton Pow-R-Line C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 350 kcmil (Cu/Al) |
| Max Wire | 350 kcmil |
| Min Wire | 4 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5.1, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Mark 75, High Interrupting Capacity, Interchangeable Trip, HACR Rated |
Product FAQs
5 answersWhat panelboards are compatible with the HKA3125?
This K-frame breaker is designed for use in Eaton Pow-R-Line C panelboards, switchboards, and motor control centers. It is also backward compatible with legacy Westinghouse panelboards that accept K-frame breakers.
Does the Eaton HKA3125 replace the older Westinghouse HKA3125?
Yes. Eaton acquired the Westinghouse distribution equipment division. The Eaton HKA3125 is the direct, drop-in replacement for the legacy Westinghouse HKA3125, sharing the same physical dimensions and mounting footprint.
What does the Mark 75 designation mean for this breaker?
Mark 75 is a legacy Westinghouse and Eaton family name for K-frame circuit breakers. The HKA3125 is part of this family and maintains the original physical dimensions for compatibility with older Mark 75 hardware and enclosures.
What is the difference between the KA3125 and the HKA3125?
The "H" designates a high-interrupting capacity version. While the standard KA3125 has an interrupting rating of 25kA at 480VAC, the HKA3125 is rated for 35kA at 480VAC.
Is the trip unit on the HKA3125 fully adjustable?
The thermal element (long-time) is fixed at 125 amps, but the magnetic element (instantaneous) is adjustable. This allows electricians to fine-tune the short-circuit response to coordinate with other protective devices in the system.
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