Eaton / Westinghouse JKL3400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
Eaton / Westinghouse JKL3400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built to maintain older electrical infrastructure, the Eaton JKL3400 is a 3-pole, 400A molded case circuit breaker from the Series C J-Frame lineup. It integrates seamlessly into legacy Westinghouse and Cutler-Hammer motor control centers and panelboards without requiring modern adapters. Equipped with thermal-magnetic trip technology, this unit mount MCCB offers fixed thermal and adjustable magnetic protection, ensuring reliable performance with a 65kAIC rating at 240VAC.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | JKL3400-R |
| Series | JKL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse/Eaton Panelboards (e.g., PRL4), Switchboards, Motor Control Centers |
| Wire Gauge | (1) 3/0 AWG - 500 kcmil (Al/Cu), (2) 3/0 AWG - 250 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 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 | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity |
Product FAQs
5 answersWhat equipment is the JKL3400 circuit breaker designed to fit?
This Series C J-Frame breaker is compatible with Eaton, Cutler-Hammer, and legacy Westinghouse distribution equipment, including PRL4 panelboards, switchboards, and motor control centers.
What are the wire size requirements for the JKL3400 lugs?
The factory-installed lugs can accommodate either a single conductor ranging from 3/0 AWG to 500 kcmil, or dual conductors from 3/0 AWG to 250 kcmil. The terminals are rated for both aluminum and copper wire.
How does the trip unit operate on the JKL3400?
It utilizes a thermal-magnetic trip unit that provides fixed thermal protection for long-time overloads and an adjustable magnetic setting. The adjustable magnetic dial allows electricians to customize the instantaneous short-circuit trip point based on specific load characteristics.
Will this breaker replace my older Westinghouse JKL3400?
Yes. Because Eaton acquired the Westinghouse electrical distribution line and Cutler-Hammer, the current Eaton JKL3400 is a direct drop-in replacement for legacy Westinghouse and Cutler-Hammer breakers sharing the same catalog number.
Does the JKL3400 require a specific mounting hardware kit?
As a unit-mount breaker, it bolts directly into the enclosure or onto the buswork. Depending on your specific panelboard or switchboard chassis, you may need to reuse your existing mounting hardware or source a separate strap kit if installing it into a new space.
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