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Eaton / Westinghouse J3125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
J3125
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
J3125
Quantity
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Eaton / Westinghouse J3125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Built for commercial distribution, the Eaton J3125 is a 125A, 3-pole MCCB from the Series C J-Frame family. It provides reliable thermal-magnetic protection for heavy-duty electrical systems. This legacy breaker installs into older Westinghouse CDP and FDP panelboards, plus Eaton Pow-R-Line 3a and 4 enclosures. It serves as an exact drop-in replacement, eliminating the need for costly panel retrofits. Rated 22 kAIC at 480VAC, it features adjustable magnetic trip settings and is HACR rated.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | J3125-R |
| Series | J |
| Amperage | 125A |
| 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/FDP Panelboards, Eaton Pow-R-Line 3a/4 Panelboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 350 kcmil |
| 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, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40°C |
| Construction Features | HACR Rated |
Product FAQs
6 answersWhich panelboards are compatible with the J3125 circuit breaker?
The J3125 is designed to bolt into legacy Westinghouse CDP and FDP panelboards, as well as Eaton Pow-R-Line 3a and 4 panelboards and Motor Control Centers.
What is the modern replacement for the legacy J3125 breaker?
The J3125 is a legacy Series C breaker that is commonly replaced by the newer JD3125 series for modern panel upgrades.
Does the J3125 include line and load side lugs?
As a bolt-on breaker, the J3125 is designed to bolt directly to the busbar on the line side. It includes lug terminals only on the load side.
What is the recommended torque specification for the load side lugs on the J3125?
For the standard aluminum TA250KB lugs accepting 4 AWG to 350 kcmil wire, the recommended torque is 275 lb-in. If using the copper-only T250KB lugs, torque to 180 lb-in.
What does the adjustable magnetic trip function on the J3125 allow you to do?
The adjustable magnetic trip allows you to customize the instantaneous short-circuit pickup level to coordinate with other protective devices in your electrical system, while the thermal overload protection remains fixed.
Is the J3125 suitable for HVAC equipment?
Yes, the J3125 is HACR rated, making it suitable for use with heating, air conditioning, and refrigeration equipment.
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Customers rate this product 4.0 out of 5 based on 1 review.
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1 review
- MCMARK C.Verified BuyerReviewingITE/Siemens J20M Control RelayI recommend this productRated 4 out of 5 stars2/4/26it control relay but it was just the coil for the relay. do you have a J20A40 CONTACTS?
it control relay but it was just the coil for the relay. do you have a J20A40 CONTACTS?