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Eaton / Cutler-Hammer J3100 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Eaton / Cutler-Hammer
J3100
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
J3100
Quantity
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Eaton / Cutler-Hammer J3100 - 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
A drop-in replacement for older commercial setups, the Eaton J3100 is a 100A, 3-pole molded case circuit breaker. It provides essential long-time and instantaneous trip functions for demanding 600VAC applications. This J-Frame breaker mounts into classic Westinghouse panelboards, switchboards, and motor control centers. When upgrading or replacing components, it can be substituted with the newer JD3100 or JDB3100 models. The unit boasts a 35kAIC interrupting capacity at 480VAC.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | J3100-R |
| Series | J |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 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, Undervoltage Release, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Lugs included |
| Standards | CSA C22.2 No. 5.1, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Trip-Free Mechanism |
Product FAQs
8 answersWhich panelboards and enclosures accept the J3100 circuit breaker?
This J-frame breaker is designed for installation in legacy Westinghouse panelboards, switchboards, and motor control centers.
How does the trip unit on the J3100 operate?
It features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element to tune the instantaneous short-circuit response.
What are the wire size limits for the standard lugs on this breaker?
The standard lugs accommodate either aluminum or copper conductors ranging from 4 AWG up to 350 kcmil.
What mounting method does the J3100 require?
It is a bolt-on breaker that must be mechanically bolted directly to the busbars of a compatible panelboard or switchboard.
Is the Eaton J3100 a direct replacement for original Westinghouse J3100 breakers?
Yes, Eaton manufactures this breaker as an exact drop-in replacement for the original Westinghouse J3100, maintaining the same physical dimensions and mounting footprint.
What are the modern Series C equivalents for the J3100?
For newer installations or upgrades, the legacy J3100 can often be substituted with Eaton Series C models such as the JD3100 or JDB3100, depending on the required interrupting capacity.
What is the primary safety consideration when replacing a legacy bolt-on breaker?
The entire panelboard or switchboard must be completely de-energized and locked out before attempting to unbolt the existing breaker or install the replacement, as the busbars will otherwise remain live.
Can the J3100 be used in DC electrical systems?
Yes, it is rated for use in DC systems up to 250 Vdc, providing a 10 kA interrupting capacity for applications like battery banks or DC motor circuits.
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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?