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Square D LX36300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- I-Line
Square D
LX36300
Molded Case Circuit Breaker
Brand
Square D
SKU
LX36300
Quantity
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Square D LX36300 - 300A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty industrial applications, this 300A three-pole MCCB utilizes a Micrologic trip unit for accurate True RMS sensing. The LSI configuration allows users to adjust parameters to match specific load requirements. It connects seamlessly into Square D I-Line panelboards. When transitioning to current generation hardware, facilities can substitute this breaker with a PowerPacT LJA36400U31X and an HNM1BL filler. A 65kAIC rating at 480VAC offers substantial short-circuit defense.Specifications
| Brand | Square D |
|---|---|
| Part Number | LX36300 |
| Series | LX |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 35kA @ 600Y/347VAC, 35kA @ 600VAC |
| Amperage Range | 150-300A |
|---|
| Frame Type | LXI |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (1) 1 AWG-600 kcmil or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Lugs (Load Side) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | True RMS Sensing, Non-Interchangeable Trip, High Interrupting Capacity |
Product FAQs
5 answersHow does the LX36300 mount into an electrical panel?
The LX36300 utilizes an I-Line style plug-in connection. This allows it to snap directly into the busbar system of Square D I-Line panelboards and switchboards, simplifying installation compared to traditional unit-mount breakers.
What are the wire gauge requirements for the LX36300 load lugs?
The included lugs accommodate either a single 1 AWG to 600 kcmil conductor or dual 1 AWG to 250 kcmil conductors per phase. They are compatible with both aluminum and copper wiring.
How does the electronic LSI trip unit benefit my electrical system?
The adjustable LSI (Long-Time, Short-Time, Instantaneous) electronic trip unit provides precise control over the breaker's time-current curve. This allows panel builders and electricians to fine-tune the protection settings for specific load requirements and improve selective coordination with downstream devices.
Is the Square D LX36300 a current production model?
No, the LX36300 is a legacy L-Frame molded case circuit breaker. Facilities looking to replace this exact model can use this legacy unit to avoid retrofitting, or they can upgrade to the current-generation Square D PowerPact L-frame series, which requires a specific filler plate for I-Line panels.
Can the LX36300 be used in systems requiring a neutral connection?
The LX36300 is a standard 3-pole circuit breaker designed for 3-phase applications. It does not include a neutral pole or integrated ground-fault protection, so any required neutral connections must be landed directly on the panel's neutral bus.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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1 review
- SDSergio D.ReviewingSquare D LXD1U7 Magnetic CoilI recommend this productRated 5 out of 5 stars12/24/21Professional
Great work got exactly what I ordered