Schneider ElectricLGA36400U43X
Square D LGA36250U31X Molded Case Circuit Breaker
- 250A
- 3 Pole
- I-Line
Square D
LGA36250U31X
Molded Case Circuit Breaker
Brand
Square D
SKU
LGA36250U31X
Quantity
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Square D LGA36250U31X - 250A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding industrial applications, this 250A, 3-pole PowerPacT L-Frame circuit breaker delivers robust electronic trip performance. Designed with an I-Line plug-on connection, this unit mounts into Square D I-Line panelboards and switchboards for quick integration. Equipped with a MicroLogic 3.3 trip unit, it offers configurable long-time and instantaneous (LI) protection with a 35 kAIC rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Series | LGA |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| Frame Type | LGA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | 2 AWG-600 kcmil (Cu), 2 AWG-500 kcmil (Al) |
| Max Wire | 600 kcmil |
| Min Wire | 2 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 3.3 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Motor Operator, Communication Module |
|---|---|
| Accessories | MicroLogic 3.3 Trip Unit |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NEMA, NOM, UL, UKCA |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, HACR Rated, 80% Rated, Mercury Free, PVC Free |
Product FAQs
9 answersWhat type of panelboard is required for the LGA36250U31X?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It features a specialized plug-on bracket and will not fit in standard NQ, NF, or QO load centers.
What does the "U31X" designate in the LGA36250U31X catalog number?
The "U31X" indicates the breaker is equipped with a Micrologic 3.3 electronic trip unit, which provides adjustable Long-Time and Instantaneous (LI) protection functions.
What does the "G" in the LGA prefix represent?
The "G" denotes the specific interrupting rating tier within the PowerPacT L-Frame family. For this tier, the breaker delivers a maximum interrupting capacity of 65kA at 240VAC, 35kA at 480VAC, and 18kA at 600VAC.
How is the line side of the LGA36250U31X connected?
The line side utilizes Square D's I-Line plug-on connection, which snaps directly onto the panelboard bus assembly. The load side uses standard mechanical lugs for wire termination.
Are the trip settings adjustable on this breaker?
Yes, the integrated Micrologic 3.3 electronic trip unit features rotary dials that allow electricians to adjust the long-time pickup, long-time delay, and instantaneous pickup settings to coordinate with specific load requirements.
Can the LGA36250U31X be reverse fed?
No. I-Line breakers have a specific line-side plug-on jaw and load-side mechanical lugs, meaning they are directional and cannot be reverse fed.
Does the Micrologic 3.3 trip unit require an external power supply to operate?
No, the Micrologic 3.3 trip unit is self-powered by the current flowing through the breaker. It does not require an external control voltage for basic overcurrent protection.
Can I add field-installable accessories like a shunt trip to the LGA36250U31X?
Yes, PowerPacT L-Frame breakers support field-installable internal accessories, including shunt trips, undervoltage releases, and auxiliary switches. These mount in the accessory compartment located behind the front cover.
Is the LGA36250U31X a direct replacement for legacy LA or LH frame breakers?
The PowerPacT L-Frame (LGA) is the modern replacement for legacy LA and LH frame I-Line breakers. However, because physical dimensions and trip unit technologies differ, you must verify panel space requirements and coordination before retrofitting.
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