Square D LLA36400U53X Circuit Breaker
Quantity
Core Specs
See full specsSquare D LLA36400U53X 3 Pole Circuit Breaker
New
Quantity
Description
Square D LLA36400U53X 3 Pole Circuit Breaker
The Square D LLA36400U53X is a 3 Pole solid state molded case circuit breaker with a current rating of 400 Amps and a voltage rating of 600VAC. It has an interrupting rating of 125kAIC at 240VAC, 100kAIC at 480VAC, 50kAIC at 600VAC. The LLA36400U53X has an I-Line bracket mounting type and includes long time, short time and instantaneous trip functions.
Specifications
| Brand | Square D |
|---|---|
| Series | PowerPacT L |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 125kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | L |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | AWG 3/0 to 500KCmil, Aluminum/Copper |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable Thermal, Adjustable Magnetic |
| Standards | RoHS, HACR |
|---|---|
| Approval | UL, CSA, NEMA, NOM, IEC |
| Temp Rating | -25 to 70 °C |
Product FAQs
7 answersCan the LLA36400U53X be installed in older I-Line panelboards?
Yes, Square D PowerPacT L-frame I-Line circuit breakers are backward compatible with existing and older I-Line panelboards and switchboard distribution sections, provided the voltage and interrupting ratings meet your system requirements.
What does the U53X suffix mean on this PowerPacT L-frame breaker?
The U53X designation indicates the breaker is equipped with a MicroLogic 5.3E electronic trip unit. This provides adjustable Long-Time, Short-Time, and Instantaneous (LSI) overcurrent protection, plus integrated energy management and power monitoring capabilities.
What wire sizes are accepted by the load lugs on the LLA36400U53X?
The standard mechanical load lugs on this 400A breaker accept aluminum or copper conductors ranging from 3/0 AWG to 500 kcmil.
Is it safe to use this 3-pole breaker in a single-phase application?
Yes, 3-pole PowerPacT L-frame breakers with MicroLogic trip units can be used in single-phase applications by utilizing any two poles. However, when used for single-phase power, they are restricted to a maximum of 240VAC.
How does the I-Line mounting system work for this breaker?
The LLA36400U53X features plug-on line-side connections that snap directly onto the busbar stack of a Square D I-Line panelboard. The load side utilizes traditional mechanical lugs for cable connections, allowing for rapid installation without line-side wiring.
How can I manually test the mechanical operation of the LLA36400U53X?
This breaker includes an integral push-to-trip button located on the front cover. Electricians can use this button to manually trip the circuit breaker and verify that the mechanical linkage is operating correctly.
What does the second L in the LLA36400U53X catalog number represent?
The second L denotes the interrupting rating tier for this specific PowerPacT breaker. It signifies a high interrupting capacity, specifically rated for 100 kA at 480VAC and 50 kA at 600VAC.
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.