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Eaton / Cutler-Hammer HFB3070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Eaton / Cutler-Hammer
HFB3070
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
HFB3070
Quantity
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Eaton / Cutler-Hammer HFB3070 - 70A 3 Pole Molded Case Circuit Breaker
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Description
Operating within the Mark 75 F-Frame family, the Eaton HFB3070 provides 70 amps of reliable overcurrent protection across three poles. This thermal-magnetic breaker is engineered for demanding industrial and commercial electrical environments. The device features a bolt-on design tailored for Eaton Pow-R-Line C panelboards, switchboards, and legacy Westinghouse enclosures. While it serves as a direct fit for existing setups, the HFD3070 is the designated modern replacement.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HFB3070-R |
| Series | HFB |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 20kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Pow-R-Line C Panelboards, Westinghouse Panelboards, Switchboards |
| Wire Gauge | 14-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
7 answersWhich panelboards are compatible with the HFB3070 circuit breaker?
This bolt-on breaker is designed for use in Eaton Pow-R-Line C panelboards, legacy Westinghouse panelboards, and compatible switchboards.
Is the Eaton HFB3070 the same as the Cutler-Hammer or Westinghouse HFB3070?
Yes. Eaton acquired the Westinghouse distribution equipment business and the Cutler-Hammer brand. The HFB3070 is the exact same F-frame molded case circuit breaker across all three brand names.
How does the HFB3070 mount into a panelboard?
It features a bolt-on mounting style. Unlike plug-on breakers, it requires a bolted connection directly to the panelboard busbar, providing a secure and reliable connection for commercial and industrial applications.
What does the Mark 75 designation mean on this breaker?
Mark 75 is a legacy Westinghouse designation for a line of high interrupting capacity circuit breakers. For the HFB series, this indicates a maximum interrupting rating of 65kA at 240V AC.
What wire sizes are accepted by the standard lugs on the HFB3070?
The factory-installed lugs accommodate 14 AWG through 1/0 AWG copper or aluminum conductors. Always ensure proper torque specifications are followed during installation.
Can the HFB3070 be used in direct current (DC) systems?
Yes, this thermal-magnetic breaker carries a DC rating of 20kA at 250V DC, making it suitable for specific non-inductive direct current applications.
What type of trip unit is installed in the HFB3070?
It features a non-interchangeable thermal-magnetic trip unit with fixed long-time (thermal) and fixed instantaneous (magnetic) trip functions, designated by the LI trip code.
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