Eaton / Cutler-Hammer JA3150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer JA3150 - 150A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy Westinghouse and Cutler-Hammer J-frame series, this 150A three-pole breaker delivers robust thermal-magnetic protection for commercial and industrial facilities. It installs into older Westinghouse panelboards, switchboards, and motor control centers requiring a bolt-on connection. Rated for 25kAIC at 240VAC and 22kAIC at 480VAC, it features an adjustable magnetic trip and comes equipped with load-side lugs. For modern upgrades, this unit is replaced by the JD3150 or JDB3150.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | JA3150-R |
| Series | JA |
| 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 Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 4 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 Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit, High Interrupting Capacity |
Product FAQs
7 answersWhat is the modern replacement for the legacy JA3150 circuit breaker?
The Eaton Series C JD3150 or JDB3150 serve as the designated modern upgrades for the legacy JA3150. Note that retrofitting a newer Series C frame into an older panelboard may require specific mounting hardware or line-side spacers to accommodate differences in terminal height.
What type of equipment is the JA3150 designed to fit?
This legacy J-frame breaker is designed for bolt-on installation in older Westinghouse and Cutler-Hammer panelboards, switchboards, and motor control centers.
How do I adjust the magnetic trip settings on this breaker?
The magnetic trip can be adjusted using a small screwdriver to turn the adjustment buttons located on the front face of the trip unit. The thermal trip element is fixed and cannot be adjusted.
Can the JA3150 be used in DC electrical systems?
Yes, in addition to standard AC networks, this breaker is rated for up to 250VDC. When applying this breaker in DC systems, note that the magnetic trip current levels are approximately 40 percent higher than they are for AC applications.
What wire sizes are compatible with the load-side lugs on the JA3150?
The included load-side lugs accept aluminum or copper wire ranging from 4 AWG up to 350 kcmil. Ensure all connections are properly torqued to the manufacturer specifications printed on the breaker faceplate to prevent excessive heating and nuisance tripping.
What type of overcurrent protection does the JA3150 provide?
It utilizes a thermal-magnetic trip unit to provide both long-time overload protection (designed to trip within 2 hours for a 135 percent overload per UL standards) and instantaneous short-circuit protection via an adjustable magnetic element.
Can I install this J-frame breaker in a modern Eaton Pow-R-Line panelboard?
The JA3150 is a legacy Westinghouse frame primarily intended for older equipment. Modern Eaton Pow-R-Line panelboards typically require current Series C, Series G, or Power Defense breakers. Always verify your panelboard's specific breaker requirements before installation.
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Reviews
Review summary
Customers rate this product 4.5 out of 5 based on 2 reviews.
- SMScott M.ReviewingEaton / Cutler-Hammer JA3125 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/4/23Great Service!!
We needed screws to attach the breaker to the buss and they included them along with other mounting hardware. Made installation much easier!
Fast shipping too!!
- MGMichael G.ReviewingEaton / Cutler-Hammer JA3175 - 175A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars3/22/23Good deal just make sure
Good deal just make sure your prepared to provide line side lugs if needed