Eaton / Cutler-Hammer HLA3300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer HLA3300 - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built to handle demanding electrical loads, this Mark 75 L-Frame breaker supplies 300 amps of continuous power with standard long-time and instantaneous trip functions. It fastens securely into compatible Eaton Series C panelboards and serves as an exact fit for older Westinghouse L-Frame infrastructure. Capable of clearing 35kA faults at 480V, the unit utilizes an interchangeable trip mechanism, allowing facility managers to adapt protection parameters without replacing the entire breaker.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HLA3300 |
| Series | HLA |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | LA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Westinghouse L-Frame Enclosures |
| 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 | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
8 answersWhat enclosures and panelboards accept the HLA3300 breaker?
This bolt-on breaker is specifically designed for installation in Eaton Series C Panelboards and Westinghouse L-Frame Enclosures.
Is the HLA3300 suitable for DC power systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC applications with a 22kA interrupting capacity, making it suitable for industrial DC distribution.
How do you adjust the instantaneous trip setting on the HLA3300?
The magnetic trip is adjusted using a dial on the front of the trip unit. For this 300A breaker, the adjustable range is typically 5 to 10 times the continuous current rating, allowing a trip setting between 1500A and 3000A.
What distinguishes the HLA3300 from the standard LA3300?
The HLA3300 is part of the Mark 75 family, which designates it as the high-interrupting capacity version. It provides a 35kAIC rating at 480VAC, whereas the standard LA3300 has a lower interrupting capacity.
Can the thermal overload protection be adjusted on the HLA3300?
No, the thermal element for long-time protection is fixed at 300A. Only the magnetic instantaneous trip function is adjustable on this specific thermal-magnetic trip unit.
Can the trip unit be replaced independently of the breaker frame?
Yes, the HLA3300 uses an interchangeable thermal-magnetic trip unit, such as the LA3300PT. This allows panel builders to replace the trip unit or change the amperage rating without removing the entire L-Frame from the panelboard.
What type of protection does the LI trip function provide?
The LI designation means the breaker provides Long-Time (thermal) protection against sustained overloads and Instantaneous (magnetic) protection against sudden short circuits.
Does the HLA3300 support DIN rail mounting?
No, this L-Frame breaker requires a bolt-on connection and is designed to be hard-mounted directly to the busbars of compatible panelboards or enclosures.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- SGScott G.ReviewingSquare D HLA36050 - 50A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/1/21Product was shipped quickly and
Product was shipped quickly and fit perfectly.