Eaton / Westinghouse HKB3070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Panel Mount
Quantity
Eaton / Westinghouse HKB3070 - 70A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed for heavy-duty commercial use, the Eaton HKB3070 is a 70A, 3-pole molded case circuit breaker from the legacy Mark 75 family. This K-Frame unit is engineered to mount into older Westinghouse and Eaton Pow-R-Line panelboards. As a dedicated replacement component, it eliminates the need for retrofitting and serves as a substitute for the HKD3070. Delivering a 65kAIC interrupt capacity at 240V, the breaker includes an interchangeable thermal-magnetic trip unit.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Series | HKB |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 20kA @ 250VDC |
| Frame Type | HKB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse Pow-R-Line Panelboards, Eaton Pow-R-Line 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, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Lugs Not Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
5 answersWhat equipment is the HKB3070 designed to fit?
This bolt-on K-frame breaker mounts in Eaton and Westinghouse Pow-R-Line panelboards, switchboards, and motor control centers. It requires appropriate K-frame mounting hardware or strap kits depending on the specific enclosure.
Are Eaton and Westinghouse HKB3070 breakers interchangeable?
Yes. Eaton acquired the Westinghouse distribution equipment business. An Eaton HKB3070 is a direct replacement for an original Westinghouse HKB3070 and fits the exact same K-frame enclosures.
Can the trip settings be adjusted on the HKB3070?
The thermal element for long-time overload protection is fixed. However, the magnetic instantaneous trip function is adjustable, allowing you to fine-tune the short-circuit response for your specific load requirements.
What does the Mark 75 designation indicate on this breaker?
In the Westinghouse and Eaton K-frame lineup, the Mark 75 designation identifies high-interrupting capacity breakers. The HKB3070 offers elevated fault protection compared to standard KB breakers, delivering 65kAIC at 240VAC and 25kAIC at 480VAC.
What type of conductors can be used with the standard lugs?
The factory-installed lugs are rated for both aluminum and copper conductors, accepting wire sizes from 3 AWG up to 350 kcmil.
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