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Eaton / Cutler-Hammer HFB3075 Molded Case Circuit Breaker
- 75A
- 3 Pole
- Bolt-On
Eaton / Cutler-Hammer
HFB3075
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
HFB3075
Quantity
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Eaton / Cutler-Hammer HFB3075 - 75A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial and industrial applications, the Eaton HFB3075 is a 75A, 3-pole molded case circuit breaker. It utilizes fixed thermal and magnetic trip technology to deliver dependable long-time and instantaneous protection. Designed for secure bolt-on installation, it fits Westinghouse FDP panels, Eaton Pow-R-Line C panelboards, and F-Frame switchboards. This unit is an excellent substitute for the FD3075. Featuring a 25kAIC rating at 480VAC, this breaker is HACR certified.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HFB3075-R |
| Series | HFB |
| Amperage | 75A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse FDP Panelboards, Eaton Pow-R-Line C Panelboards, F-Frame 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 | High Interrupting Capacity, HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
8 answersWhich panelboards are compatible with the HFB3075 circuit breaker?
This breaker is designed to bolt directly into legacy Westinghouse FDP panelboards, modern Eaton Pow-R-Line C panelboards, and standard F-Frame switchboards.
Can I use an Eaton HFB3075 to replace an older Westinghouse HFB3075?
Yes. Eaton acquired the Westinghouse distribution equipment line, so the Eaton or Cutler-Hammer HFB3075 is a direct, electrically and physically interchangeable replacement for the original Westinghouse model.
What wire sizes do the standard lugs on the HFB3075 accept?
The factory-installed load side lugs accommodate copper or aluminum conductors ranging from 14 AWG up to 1/0 AWG. Ensure proper torque specifications are followed during installation.
Is the HFB3075 suitable for direct current applications?
Yes, this thermal magnetic breaker is rated for use in DC systems up to 250VDC, providing a 10kA interrupting capacity. This makes it suitable for specific industrial control and battery backup applications.
What does the Mark 75 designation mean for the HFB series?
The Mark 75 family indicates a high interrupting capacity version of the standard F-Frame breaker. The HFB3075 provides up to 65kA of interrupting capacity at 240VAC, which is significantly higher than standard FB breakers.
How does the HFB3075 mount into the panelboard?
It features a bolt-on mounting style, meaning it secures directly to the panelboard busbars with bolts rather than snapping or plugging into place. This provides a secure, high-vibration resistant connection for industrial environments.
Are the trip settings on the HFB3075 adjustable?
No. This breaker features a fixed thermal and fixed magnetic trip unit, meaning the long-time and instantaneous trip thresholds cannot be adjusted in the field.
What does the LI trip function code indicate on this breaker?
The LI designation means the breaker provides Long-Time and Instantaneous protection. The long-time function protects against sustained overloads, while the instantaneous function protects against short circuits.
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