Eaton / Westinghouse HK3070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Panel Mount
Eaton / Westinghouse
HK3070
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
HK3070
Quantity
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Eaton / Westinghouse HK3070 - 70A 3 Pole Molded Case Circuit Breaker
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Description
Built to handle heavy-duty commercial loads, this 70-amp K-Frame breaker offers reliable fixed thermal and adjustable magnetic protection. It installs seamlessly into legacy Westinghouse panelboards, switchboards, and motor control centers, serving as an exact match for discontinued hardware. With a robust 100kA interrupt rating at 240VAC and 65kA at 480VAC, this three-pole panel mount unit ensures superior fault clearing capabilities for demanding industrial electrical systems.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Series | HK |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | HK |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse 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 |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CE, CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, HACR Rated |
Product FAQs
6 answersIs the HK3070 manufactured by Eaton or Westinghouse?
The HK3070 was originally designed and manufactured by Westinghouse. Eaton acquired the Westinghouse electrical distribution division in the 1990s, so this Series C K-frame breaker is now classified under the Eaton and Cutler-Hammer brands. It serves as a direct replacement for legacy Westinghouse installations.
What equipment is the HK3070 designed to be installed in?
This Series C K-frame breaker is engineered for use in Eaton, Cutler-Hammer, and legacy Westinghouse panelboards, switchboards, and motor control centers.
Does the HK3070 require a specific busbar connection to mount?
No. The HK3070 features a feed-thru connection type, meaning it comes equipped with standard lugs on both the line and load sides. This allows for direct wire connections without needing a proprietary plug-on or bolt-on busbar, making it suitable for standalone panel mount applications.
How does the adjustable magnetic trip function work on the HK3070?
While the thermal overload protection is fixed at 70 amps, the adjustable magnetic trip allows electricians to fine-tune the instantaneous short-circuit pickup threshold. This adjustability helps coordinate the breaker with downstream devices and prevents nuisance tripping from high inrush currents.
What type of protection does the LI trip function code indicate?
The LI designation stands for Long-Time and Instantaneous trip functions. The Long-Time thermal function protects the circuit against sustained overloads, while the Instantaneous magnetic function clears severe short circuits immediately to prevent equipment damage and fire hazards.
Can I use aluminum conductors with the HK3070 lugs?
Yes, the factory-installed lugs on the HK3070 are dual-rated for both aluminum and copper wire. They accept conductor sizes ranging from 3 AWG up to 350 kcmil.
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