Eaton / Cutler-Hammer L3300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer L3300 - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for industrial power distribution, the Eaton L3300 provides 300A of continuous current handling. This 3-pole MCCB is part of the classic PB Frame family, designed to protect critical commercial circuits. It installs into compatible Westinghouse and Cutler-Hammer switchboards and motor control centers. Delivering a 30 kAIC interrupt rating at 480V, it utilizes an interchangeable trip unit with adjustable magnetic response and carries a HACR rating for HVAC loads.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | L3300-R |
| Series | L |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Panelboards, Cutler-Hammer Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 250-500 kcmil (Aluminum/Copper) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| 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 | Includes Line and Load Lugs (TA600LA) |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit, HACR Rated |
Product FAQs
7 answersWhat equipment is the L3300 circuit breaker designed to fit?
This L-frame breaker installs directly into compatible legacy Westinghouse and Cutler-Hammer panelboards, switchboards, and motor control centers. It utilizes a standard unit mount configuration for secure installation.
What wire gauge range is supported by the standard lugs on this breaker?
The factory-installed lugs accommodate two 250 to 500 kcmil aluminum or copper conductors per phase. This dual-barrel lug design allows for parallel conductor runs in high-amperage commercial applications.
Can the L3300 be utilized in direct current (DC) systems?
Yes, in addition to standard AC voltages, this breaker is rated for DC applications up to 250VDC. It provides a 10 kA interrupting capacity for DC loads, making it suitable for specific industrial control and battery systems.
How is the magnetic trip adjusted on this thermal-magnetic breaker?
The magnetic trip element can be adjusted independently for each pole by turning the adjustment buttons on the front face of the trip unit with a screwdriver. The thermal element remains fixed for standard overload protection.
Is the Eaton L3300 a direct replacement for the original Westinghouse version?
Yes, Eaton acquired the Cutler-Hammer and Westinghouse distribution equipment lines. This breaker serves as an exact drop-in replacement for the legacy Westinghouse L3300, sharing the identical L-frame dimensions and mounting hardware.
Why is the magnetic trip adjustable on this L-frame breaker?
The adjustable magnetic trip allows electricians to customize the short-circuit response threshold. This prevents nuisance tripping from high inrush currents, such as motor startups, while ensuring rapid protection against severe electrical faults.
What does the LI trip function code indicate on this breaker?
The LI designation means the breaker provides Long-Time (thermal) and Instantaneous (magnetic) trip functions. The Long-Time function protects against sustained overloads, while the Instantaneous function clears short circuits.
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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.