Square D LC36450-1021 Molded Case Circuit Breaker
- 450A
- 3 Pole
- I-Line
Quantity
Square D LC36450-1021 - 450A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Providing advanced control, the LC36450-1021 is a 3-pole, 450A MCCB. It features a factory-installed 120-240VAC shunt trip for remote disconnection. This L-Frame breaker mounts into Square D I-Line panelboards. It is replaced by the LJA36600U31X, which requires a separate shunt trip accessory and trip adjustment to 450A. Delivering 65 kAIC at 480VAC, it utilizes thermal-magnetic technology with LI protection. Load-side lugs are included for 4/0 AWG to 500 kcmil wiring.Specifications
| Brand | Square D |
|---|---|
| Part Number | LC36450-1021 |
| Series | LC |
| Amperage | 450A |
| 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 | Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Extra High Interrupting Capacity |
Product FAQs
7 answersWhat does the -1021 suffix indicate on the LC36450-1021 catalog number?
The -1021 suffix designates a factory-installed 120/240VAC shunt trip, allowing the breaker to be tripped remotely for emergency stops or control system integration.
Can I install the LC36450-1021 in a standard Square D QO or Homeline load center?
No, this breaker features an I-Line plug-in connection and is strictly compatible with Square D I-Line panelboards and switchboards.
What are the conductor requirements for the LC36450-1021 lugs?
The breaker is equipped with lugs that accept two 4/0 AWG to 500 kcmil conductors per phase. Both aluminum and copper wires are supported.
Are the thermal and magnetic trip settings adjustable on the LC36450-1021?
The thermal protection for overload conditions is fixed, while the magnetic protection for short circuits is adjustable to coordinate with downstream devices.
What does the LI trip function code mean on this breaker?
The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) protection for overloads and Instantaneous (I) protection for short circuits.
Is the LC36450-1021 rated for direct current (DC) systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC applications with a 10kA interrupting capacity.
Is the LC36450-1021 a modern PowerPact breaker?
No, it is a legacy Square D L-Frame molded case circuit breaker. It serves as a direct replacement for existing legacy LC frame installations.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 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.