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Eaton / Westinghouse JA3100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
JA3100
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
JA3100
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Eaton / Westinghouse JA3100 - 100A 3 Pole Molded Case Circuit Breaker
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100A 3 Pole Molded Case Circuit Breaker
100A 3 Pole Molded Case Circuit Breaker
100A 3 Pole Molded Case Circuit Breaker
Description
Maintaining aging electrical infrastructure requires reliable components like the Eaton JA3100. This 100-amp, three-pole molded case circuit breaker provides thermal-magnetic protection for commercial and industrial applications. It installs into classic Westinghouse panelboards, switchboards, and motor control centers without requiring modern adapters. Rated for 25kAIC at 240VAC and 14kAIC at 600VAC, it serves as an exact fit for facilities needing to replace worn J-frame breakers.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | JA3100-R |
| Series | JA |
| Amperage | 100A |
| 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 |
| 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 | Auxiliary Switch, Shunt Trip, Undervoltage Release |
|---|---|
| Accessories | Lugs |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
5 answersAre Eaton, Cutler-Hammer, and Westinghouse JA3100 breakers interchangeable?
Yes. Eaton acquired the Westinghouse electrical distribution business, so JA3100 breakers branded under Eaton, Cutler-Hammer, or Westinghouse are the exact same physical and electrical component.
What equipment is the JA3100 circuit breaker designed to fit?
This legacy J-frame breaker bolts directly into classic Westinghouse panelboards, switchboards, and motor control centers. It serves as an exact-fit replacement for aging infrastructure, eliminating the need for modern retrofit adapters.
Does the JA3100 come with lugs on both the line and load sides?
The breaker is supplied complete with load-side lug terminals that accept 4 AWG to 350 kcmil wire. Because it is a bolt-on breaker, the line-side connections typically bolt directly to the bus in panelboard and switchboard applications, so line lugs are not included.
How does the adjustable magnetic trip function on this breaker?
While the thermal overload protection is fixed, the adjustable magnetic element allows you to tune the instantaneous short-circuit response. This is useful for coordinating with downstream protective devices or handling specific motor inrush currents without nuisance tripping.
Is the Westinghouse JA3100 still actively manufactured?
The original Westinghouse JA-frame series is a legacy product and is no longer in active production. Exact-fit replacements are sourced to maintain existing infrastructure without requiring panel modifications.
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Reviews
Review summary
Customers rate this product 4.5 out of 5 based on 2 reviews.
Total 5 star reviews: 1 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
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