Free Shipping Over $99
Square D LX36300G Molded Case Circuit Breaker
- 300A
- 3 Pole
- I-Line
Square D
LX36300G
Molded Case Circuit Breaker
Brand
Square D
SKU
LX36300G
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D LX36300G - 300A 3 Pole Molded Case Circuit Breaker
New
Quantity
Similar Items
600A 3 Pole Molded Case Circuit Breaker
600A 3 Pole Molded Case Circuit Breaker
250A 3 Pole Molded Case Circuit Breaker
Description
Providing comprehensive circuit defense, this 300A three-pole MCCB includes a Micrologic trip unit with Long, Short, Instantaneous, and Ground Fault (LSIG) capabilities. The solid-state design ensures highly repeatable trip curves. This legacy component mounts into Square D I-Line switchboards. For system modernization, it is replaced by the PowerPacT LJA36400U44X, requiring an HNM1BL filler plate and trip unit adjustment to 300A. True RMS sensing prevents nuisance tripping from harmonics.Specifications
| Brand | Square D |
|---|---|
| Part Number | LX36300G |
| 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 | LX |
|---|---|
| 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 | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| 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 | HACR Rated, High Interrupting Capacity, True RMS Sensing, Non-Interchangeable Trip |
Product FAQs
7 answersWhat type of panelboards or switchboards is the LX36300G compatible with?
This breaker features an I-Line style plug-in connection and is designed exclusively for use in Square D I-Line panelboards and switchboards. It will not fit standard QO or NQ panels.
What wire sizes and materials are accepted by the lugs on this breaker?
The factory lugs accept either a single conductor from 1 AWG to 600 kcmil or dual conductors from 1 AWG to 250 kcmil per phase. They are rated for both aluminum and copper wiring, making them suitable for parallel runs.
How does the I-Line connection type mount into the panel?
I-Line breakers feature a plug-on design for the line side that snaps directly onto the panel busbar stack. The load side uses traditional mechanical lugs for wire termination. This allows for rapid installation and easy phase balancing.
Does this breaker use a thermal-magnetic or electronic trip unit?
The LX36300G utilizes a solid-state electronic trip unit. This provides highly repeatable trip curves and adjustable settings for precise system coordination compared to standard thermal-magnetic breakers.
What does the G in the LSIG trip function indicate?
The G stands for Ground-Fault protection. This electronic trip unit provides integrated ground-fault sensing for equipment protection, in addition to long-time, short-time, and instantaneous overcurrent protection.
Does the ground-fault protection on this breaker serve as personnel protection?
No. The ground-fault function on this LSIG trip unit is designed for equipment protection against arcing ground faults. It is not a Class A GFCI device intended for personnel protection.
Is the LX36300G still actively manufactured, or is there a direct replacement?
The LX frame is a legacy component. For system modernization, it is typically replaced by a PowerPacT L-Frame breaker, such as the LJA36400U44X. Upgrading to the newer frame requires an HNM1BL filler plate and adjusting the trip unit to 300A.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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
Search
Rating
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