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Eaton / Cutler-Hammer KB3150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Bolt-On
Eaton / Cutler-Hammer
KB3150
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
KB3150
Quantity
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Eaton / Cutler-Hammer KB3150 - 150A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Description
Built to industrial specifications, the 150-amp KB3150 provides essential LI protection for heavy-duty electrical systems. This three-pole K-Frame unit incorporates an interchangeable trip design to accommodate changing facility requirements. The bolt-on configuration ensures a rigid connection within Westinghouse CDP panelboards and Eaton motor control centers. Delivering a 25kAIC rating at 240VAC, this HACR-approved breaker handles high-demand HVAC and motor loads effectively.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | KB3150-R |
| Series | KB |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 22kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse CDP Panelboards, Eaton Series C 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 | Load Side Lugs |
| Standards | NEMA AB-1, UL 489, CSA C22.2 No. 5 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip |
Product FAQs
7 answersWhich panelboards and equipment are compatible with the KB3150 circuit breaker?
The KB3150 is designed for use in legacy Westinghouse CDP panelboards, Eaton Series C panelboards, as well as compatible industrial switchboards and motor control centers.
Is the Eaton KB3150 still manufactured, or is there a direct replacement?
The KB3150 is a legacy K-Frame breaker that is no longer in active production. Eaton has transitioned this line to the newer JD3150 (JD series) for modern replacements, though the KB3150 remains available for maintaining existing systems without requiring bus modifications.
How does the trip unit on the KB3150 operate?
It utilizes a thermal-magnetic trip mechanism with Long-Time and Instantaneous (LI) protection. The thermal element is fixed for the 150A continuous rating, while the magnetic instantaneous trip is adjustable to help coordinate with motor inrush currents or downstream devices.
What are the wire size requirements for installing the KB3150?
The breaker comes equipped with mechanical lugs that accept 3 AWG to 350 kcmil aluminum or copper (Al/Cu) wire. Ensure your conductors are sized appropriately for the 150A rating and torqued to the manufacturer specifications during installation.
Is the KB3150 suitable for direct current (DC) systems?
Yes, this breaker is rated for 250VDC applications with a 10kA interrupting capacity, making it suitable for specific industrial DC control panels and battery systems alongside its standard AC applications.
Does the KB3150 require a specific mounting hardware kit?
As a bolt-on K-Frame breaker, it bolts directly to the bus in Westinghouse CDP and Eaton Series C panelboards. No special plug-in adapters are required, but you must use the appropriate bus hardware for your specific enclosure.
How can I test the mechanical operation of the KB3150?
You can manually exercise the breaker mechanism by pressing the push-to-trip button on the front of the unit. This verifies the mechanical linkage is operating correctly and should be done periodically as part of standard maintenance.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
Total 5 star reviews: 3 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
3 reviews
- DHDavid H.ReviewingEaton / Cutler-Hammer KB3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/21/23very easy to order and
very easy to order and received order promptly
- KLKelsee L.ReviewingEaton / Cutler-Hammer KB3250 - 250A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/29/21Excellent
Excellent
- BSBill S.ReviewingEaton / Cutler-Hammer KB3200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/26/19electrical contractor
no hassle, good product that has been recertified. very satisfied with the result!