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Square D LC36300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- I-Line
Square D
LC36300
Molded Case Circuit Breaker
Brand
Square D
SKU
LC36300
Quantity
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Square D LC36300 - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
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Square D LC36300 - 300A 3 Pole Molded Case Circuit Breaker
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Quantity
| Brand | Square D |
|---|---|
| Part Number | LC36300 |
| Series | LC |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LC |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (2) 4/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 4/0 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 | Lugs |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Extra High Interrupting Capacity, HACR Rated |
Quantity
Square D LC36300 - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | LC36300-R |
| Series | LC |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LC |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (2) 4/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 4/0 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 | Lugs |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Extra High Interrupting Capacity, HACR Rated |
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Description
The LC36300 is a legacy 3-pole molded case circuit breaker manufactured by Square D. Built for heavy-duty applications, it provides reliable thermal-magnetic protection with long-time and instantaneous (LI) trip functions. It mounts into Square D I-Line panelboards and switchboards. For modern replacements, it crosses over to the PowerPact LJA36400U31X, which can be dialed down to 300 amps. Rated for 65 kAIC at 480VAC, this extra-high interrupting capacity breaker handles demanding faults.Specifications
| Brand | Square D |
|---|---|
| Part Number | LC36300-R |
| Series | LC |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LC |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (2) 4/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 4/0 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 | Lugs |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Extra High Interrupting Capacity, HACR Rated |
Product FAQs
6 answersWhat panelboards are compatible with the LC36300?
This circuit breaker is designed for use in Square D I-Line panelboards and switchboards. Its plug-on construction connects directly to the panel bus without requiring separate mounting straps.
What is the purpose of the adjustable magnetic trip on this breaker?
While the fixed thermal element provides continuous overload protection at 300 amps, the adjustable magnetic trip allows licensed electricians to fine-tune the instantaneous short-circuit response. This helps coordinate with downstream breakers and prevents nuisance tripping.
What conductor sizes are supported by the factory lugs?
The standard lugs on the LC36300 accommodate two conductors per phase. They accept either copper or aluminum wire ranging from 4/0 AWG up to 500 kcmil.
Is the LC36300 part of an active or legacy product line?
The LC36300 is part of the legacy Square D L-Frame series. Upgrading to a current generation typically involves a Schneider Electric PowerPact L-Frame equivalent. The manufacturer recommended replacement is the LJA36400U31X, which features a trip unit that can be adjusted down to match a 300A requirement.
Do I need a separate strap kit to mount this breaker?
No. The I-Line design includes integrated plug-on jaws that mate directly to the internal busbar, eliminating the need for bolt-on strap kits or specialized mounting hardware.
How does the breaker stay secured to the panel during a fault?
In addition to the friction of the plug-on jaws, I-Line breakers utilize a captive retaining screw that threads into the panelboard backpan. This ensures the breaker remains safely locked in place under high magnetic forces generated by a short circuit.
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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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Rating
1 review
- DLDeanna L.Verified BuyerReviewingSquare D LC36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/11/26Square D LC36600 - 600A 3 Pole Molded Case Circuit Breaker
Worked great! Our customer was very pleased with the results.