Eaton / Cutler-Hammer L3400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer L3400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Operating as a critical safety device, the Eaton L3400 is a 3-pole, 400A legacy circuit breaker. It safeguards heavy industrial loads against damaging short circuits. This breaker mounts securely into vintage Cutler-Hammer and Westinghouse panelboards. Professionals should note this PB Frame unit is replaced by the newer LD3400 model. The device utilizes a reliable thermal-magnetic trip mechanism with adjustable magnetic capabilities. It provides a 35 kAIC interrupting capacity at 480VAC.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | L3400-R |
| Series | L |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Cutler-Hammer Panelboards, Switchboards, Motor Control Centers |
| 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 | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit, HACR Rated |
Product FAQs
8 answersIs there a modern replacement for the legacy L3400 circuit breaker?
Yes. The L3400 is a legacy PB Frame breaker originally manufactured by Westinghouse and Cutler-Hammer. For modern panel upgrades, it is typically replaced by the newer Eaton Series C LD3400 model.
Which legacy panelboards will accept the L3400 breaker?
This unit is a direct fit for vintage Westinghouse and Cutler-Hammer panelboards, switchboards, and motor control centers that require a PB Frame footprint.
How is the thermal-magnetic trip unit configured on the L3400?
The breaker utilizes an LI (Long-Time, Instantaneous) trip function. The thermal element is fixed for standard overload protection, while the magnetic instantaneous trip is adjustable to coordinate with specific short-circuit fault levels.
What does the unit mount designation mean for installation?
As a unit-mount breaker, the L3400 bolts directly to the backpan or chassis of the enclosure and requires hardwired cable connections at both the line and load lugs, rather than plugging directly onto a busbar.
What is the short-circuit interrupting capacity of this breaker in 480V systems?
The L3400 is rated to safely interrupt up to 35,000 amps (35 kAIC) during a fault in a 480VAC system.
Is the L3400 suitable for direct current applications?
Yes, it is rated for DC systems up to 250VDC, providing a maximum interrupting capacity of 22 kAIC for DC loads.
Can the trip unit on the L3400 be swapped out?
Yes, this breaker features an interchangeable trip unit design. This allows electricians to replace or upgrade the trip mechanism without having to remove the entire breaker frame from the panel.
Does the L3400 carry a HACR rating?
Yes, this breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment that requires specialized short-circuit and overload protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- JHJoel H.ReviewingWestinghouse L56D Contact BlockI recommend this productRated 5 out of 5 stars2/28/18Owner
Product was exactly as described, will use again in the future.