Square D LGL36400CU44X Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LGL36400CU44X
Molded Case Circuit Breaker
Brand
Square D
SKU
LGL36400CU44X
Quantity
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Square D LGL36400CU44X - 400A 3 Pole Molded Case Circuit Breaker
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Description
Part of the PowerPacT L-Frame series, the Square D LGL36400CU44X delivers advanced circuit protection for commercial and industrial applications. This 3-pole, 400A molded case circuit breaker is 100% rated, allowing full utilization of the breaker's capacity. It features a MicroLogic 6.3A electronic trip unit with adjustable long-time, short-time, instantaneous, and ground-fault (LSIG) settings, plus an integrated ammeter. It installs into Square D switchboards and motor control centers.Specifications
| Brand | Square D |
|---|---|
| Series | LGL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | L |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, Enclosures |
| Wire Gauge | (2) 2/0 AWG-500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Trip Unit Model | MicroLogic 6.3A |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Rotary Handle, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs (AL600LS52K3) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, HACR, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | 100% Rated, HACR Rated, Current Limiting, True RMS Sensing |
Product FAQs
7 answersWhat does the C in the LGL36400CU44X catalog number indicate?
The C designates that this circuit breaker is 100% rated for continuous current. This allows the breaker to carry its full 400A rating continuously, rather than the standard 80% limit, provided it is installed in an enclosure approved for 100% rated devices.
Which specific trip unit is installed in the LGL36400CU44X?
This breaker features the Micrologic 6.3A electronic trip unit. The U44X suffix indicates it includes an integrated ammeter and provides LSIG protection (Long-time, Short-time, Instantaneous, and Ground Fault).
Can I adjust the ground fault protection on the Micrologic 6.3A trip unit?
Yes, the Micrologic 6.3A trip unit allows for adjustable ground fault pickup and delay settings to coordinate with downstream devices and meet specific system protection requirements.
What type of lugs are included with this L-frame breaker?
The LGL36400CU44X comes standard with AL600LS52K3 mechanical lugs on both the line and load sides. These lugs accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase.
Can the LGL36400CU44X be reverse fed?
No. Because this is a 100% rated circuit breaker, it is marked with specific Line and Load designations. It is not suitable for reverse connection applications.
Does this breaker support Zone Selective Interlocking (ZSI)?
Yes, the Micrologic 6.3A trip unit includes Zone Selective Interlocking capabilities. ZSI allows the breaker to communicate with upstream and downstream devices to reduce fault clearing times while maintaining system coordination.
What internal accessories can be field-installed in this breaker?
The PowerPacT L-frame accepts a variety of internal accessories, including shunt trips, undervoltage releases, auxiliary switches (OF), and overcurrent trip switches (SDE). These snap into cavities behind the front accessory cover.
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