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Square D LI36450 Molded Case Circuit Breaker
- 450A
- 3 Pole
- I-Line
Square D
LI36450
Molded Case Circuit Breaker
Brand
Square D
SKU
LI36450
Quantity
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Square D LI36450 - 450A 3 Pole Molded Case Circuit Breaker
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Description
Part of the legacy L-Frame series, the Square D LI36450 is a 3-pole, 450A current-limiting MCCB for commercial and industrial applications. It provides reliable long-time and instantaneous (LI) protection. This breaker installs into Square D I-Line panelboards. For modern upgrades, it is replaced by the PowerPacT LRA36600U31X, which requires adjusting the trip unit to 450A. Rated 200 kAIC at 480VAC, it limits let-through energy to protect downstream equipment.Specifications
| Brand | Square D |
|---|---|
| Part Number | LI36450 |
| Series | LI |
| Amperage | 450A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480Y/277VAC, 200kA @ 480VAC, 100kA @ 600Y/347VAC, 100kA @ 600VAC |
| Frame Type | LI |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| 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, NEMA AB 1, NFPA 70, UL 489 |
| Approval | CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, High Interrupting Capacity, HACR Rated |
| Special Features | Current Limiting |
Product FAQs
6 answersWhat type of panelboard is the LI36450 designed for?
This breaker is designed exclusively for use in Square D I-Line panelboards. It features an I-Line style plug-in connection that mounts directly to the panel busbar stack.
What wire sizes are accepted by the lugs on the LI36450?
The standard lugs accept two 4/0 AWG to 500 kcmil aluminum or copper conductors per phase.
What does the current limiting designation mean for this breaker?
As a current-limiting breaker, it clears faults extremely fast to reduce the let-through current and energy. This provides enhanced protection for sensitive downstream equipment during a short circuit.
Is the LI36450 still in active production?
The LI36450 is part of the legacy L-Frame series. For modern upgrades, it is often replaced by the PowerPact L-Frame series, such as the LRA36600U31X, which requires adjusting the trip unit to 450A.
How does the trip unit operate on the LI36450?
It utilizes a thermal-magnetic trip unit with fixed thermal protection for overloads and an adjustable magnetic trip function. This allows you to coordinate the instantaneous short-circuit response with other devices in your system.
How is the I-Line connection secured in the panelboard?
The breaker plugs directly onto the I-Line bus stack and is secured in place with a retaining screw. This ensures a solid mechanical and electrical connection without the need for individual cable connections to the bus.
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