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Eaton / Westinghouse LM3300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
LM3300
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
LM3300
Quantity
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Eaton / Westinghouse LM3300-R - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Description
Rated for 300 amps, the Eaton LM3300 is a 3-pole molded case circuit breaker belonging to the Series C family. This robust L-Frame component ensures dependable thermal-magnetic protection. This unit installs into older Westinghouse panelboards, switchboards, and motor control centers. As a legacy component, it provides a direct fit for existing setups and can be substituted with the KD3300.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | LM3300-R |
| Series | LM |
| Amperage | 300A |
| 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 equipment is the LM3300 designed to fit?
This breaker is engineered for direct bolt-on installation into legacy Westinghouse panelboards, switchboards, and motor control centers.
What is a common substitute for the legacy LM3300?
The LM3300 is often substituted with a KD3300 series circuit breaker. Note that retrofitting with a newer Series C KD3300 may require a TAD3 spacer kit to fit the original panelboard footprint.
How is the thermal-magnetic trip unit configured?
It features a fixed thermal element for consistent overload protection, paired with an adjustable magnetic setting that allows electricians to fine-tune the short-circuit response.
What protection is provided by the LI trip function?
The LI designation means the breaker delivers Long-Time protection against standard overloads and Instantaneous protection for immediate short-circuit clearing.
Can the trip unit on the LM3300 be swapped out?
Yes, this breaker is built with an interchangeable trip unit design, allowing you to modify the protection characteristics without replacing the entire frame.
Are load side lugs included with the LM3300?
Yes, the breaker comes complete with load side lug terminals installed and ready for wiring.
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