Eaton / Cutler-Hammer HKB3150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Panel Mount
Quantity
Eaton / Cutler-Hammer HKB3150 - 150A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Belonging to the Cutler-Hammer Mark 75 series, the HKB3150 delivers 150A of 3-pole overcurrent protection. Designed for panel mount applications, it fits perfectly into Eaton Series C panelboards and industrial switchboards. Delivering a high interrupting capacity of 65kA at 240VAC, it utilizes fixed thermal and adjustable magnetic trip functions to safeguard critical circuits. For facilities updating their infrastructure, this K-Frame model crosses over to the newer HKD3150.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HKB3150-R |
| Series | HKB |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 20kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Eaton Series C Panelboards, Mark 75 Panelboards, Switchboards |
| Wire Gauge | 3 AWG - 350 kcmil |
| 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, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Mark 75, High Interrupting Capacity, HACR Rated, Reverse Feed |
Product FAQs
6 answersWhat panelboards are compatible with the HKB3150 circuit breaker?
This K-frame breaker is designed for installation in Eaton Series C panelboards, legacy Mark 75 panelboards, and standard switchboards. It serves as a direct replacement for original Cutler-Hammer and Westinghouse HKB breakers.
Is the HKB3150 suitable for DC power systems?
Yes, this breaker carries a 250VDC rating with a 20kA interrupting capacity. This allows it to be used in industrial DC applications or battery systems that fall within its voltage and fault current limits.
What are the wire size limits for the HKB3150 lugs?
The factory-installed lugs accept conductors from 3 AWG up to 350 kcmil. When installing, verify that your conductor material and size align with the thermal requirements of the panelboard and local electrical codes.
What is the advantage of the adjustable magnetic trip on the HKB3150?
While the thermal element provides fixed long-time overload protection, the adjustable magnetic element allows electricians to set the instantaneous short-circuit pickup. This adjustability is critical for proper selective coordination with upstream and downstream breakers in the electrical system.
Is this breaker interchangeable with older Westinghouse HKB3150 models?
Yes, Eaton acquired the Westinghouse distribution equipment line. This Eaton Cutler-Hammer HKB3150 provides the exact same form, fit, and function as the legacy Westinghouse HKB3150.
How is the HKB3150 mounted in a panelboard?
This is a bolt-on, panel mount circuit breaker. It secures directly to the busbar using bolted connections, providing a robust and reliable mechanical and electrical connection suitable for high-vibration or heavy-duty industrial environments.
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