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Eaton / Westinghouse LM3800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
LM3800
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
LM3800
Quantity
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Eaton / Westinghouse LM3800-R - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Description
Operating as a vital component for 600VAC applications, the Eaton LM3800 is a robust 800-amp, 3-pole MCCB. It features standard interrupting capacity and reliable LI trip functions for industrial environments. The unit integrates into vintage Westinghouse enclosures and MCCs. By matching original factory dimensions, it eliminates the need for complex retrofits. Facilities migrating to newer standards typically transition to the MDL3800 substitute.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | LM3800-R |
| Series | LM |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (3) 3/0 AWG - 300 kcmil |
| Max Wire | 300 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 | Standard Interrupting Capacity |
Product FAQs
6 answersWhat is the modern substitute for the Westinghouse LM3800 circuit breaker?
Facilities upgrading to newer standards typically transition to the Eaton MDL3800. However, using the LM3800 maintains original factory dimensions in vintage Westinghouse enclosures, avoiding complex retrofits.
Which enclosures are compatible with the LM3800 breaker?
This L-Frame breaker is designed to integrate directly into vintage Westinghouse panelboards, switchboards, and motor control centers without requiring modification.
What wire size is accepted by the load side lug terminals on this 800A breaker?
The included lugs accept three conductors per phase, accommodating wire sizes from 3/0 AWG up to 300 kcmil.
Can the LM3800 be used in DC power systems?
Yes, in addition to its 600VAC rating, this breaker is rated for 250VDC applications with a 10kA interrupting capacity, allowing it to protect industrial DC circuits.
How is the trip unit configured on the LM3800?
It utilizes a thermal-magnetic trip unit with Long-Time and Instantaneous (LI) protection. The thermal overload protection is fixed, while the instantaneous magnetic short-circuit trip is adjustable to coordinate with other devices in your system.
What is the mounting configuration for the LM3800?
This is a bolt-on breaker designed for secure, high-amperage busbar connections in Westinghouse L-Frame panelboards and switchboards.
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