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Eaton / Westinghouse LM3350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
LM3350
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
LM3350
Quantity
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Eaton / Westinghouse LM3350-R - 350A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Description
Built for commercial and industrial distribution, the LM3350 delivers 350A of thermal-magnetic protection. It is part of the classic Series C L-Frame family. The bolt-on MCCB installs into Westinghouse panelboards, switchboards, and motor control centers. It provides a seamless cross-reference for aging equipment and is superseded by the KD3350. Delivering 18 kAIC interrupting capacity at 480VAC, this three-pole unit includes an interchangeable trip unit.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | LM3350-R |
| Series | LM |
| Amperage | 350A |
| 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 | 3/0 AWG-350 kcmil |
| Max Wire | 350 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 | Interchangeable Trip Unit |
Product FAQs
6 answersWhat enclosures accept the LM3350-R circuit breaker?
This bolt-on MCCB is designed for direct installation into legacy Westinghouse panelboards, switchboards, and motor control centers.
Can the LM3350-R be used in direct current (DC) applications?
Yes, this breaker is rated for DC systems up to 250VDC, providing a 10kA interrupting capacity for industrial DC power distribution.
What wire sizes are compatible with the LM3350-R load side lugs?
The load side lug terminals accommodate conductors ranging from 3/0 AWG to 350 kcmil, supporting standard commercial and industrial wiring requirements.
How does the adjustable magnetic trip work on the LM3350-R?
While the thermal overload protection is fixed, the adjustable magnetic trip allows panel builders and electricians to fine-tune the instantaneous short-circuit pickup level to match specific load requirements.
What breaker family does the LM3350-R belong to?
It is part of the Eaton / Cutler-Hammer Series C L-Frame family, providing a direct replacement for aging Westinghouse LM series breakers.
What does the LI trip function code indicate on this breaker?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) overload protection and Instantaneous (I) short-circuit protection.
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