Square D LLA36400U44X Molded Case Circuit Breaker
- 400A
- 3 Pole
- I-Line
Quantity
Square D LLA36400U44X - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed for maximum facility safety, this 400A electronic trip circuit breaker incorporates advanced ground fault sensing. The PowerPacT L-Frame device is ideal for heavy-duty power distribution. Utilizing the proven I-Line mounting configuration, it installs into standard Square D switchboards. Facility managers can use this model to upgrade legacy LA36400 and LH36400 breakers. The MicroLogic 6.3A trip unit features LSIG functions alongside a built-in ammeter for precise monitoring.Specifications
| Brand | Square D |
|---|---|
| Part Number | KC34125G-R |
| Series | LLA |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 125kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC |
| Amperage Range | 160-400A |
|---|
| Frame Type | LLA |
|---|---|
| Terminal Type | Lugs |
| For Use With | I-Line Panelboards, I-Line Switchboards |
| 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 | Ammeter |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Communication Module |
|---|---|
| Accessories | MicroLogic 6.3A Trip Unit, Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CCC, CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, HACR Rated, True RMS Sensing, Ground Fault Protection, Phase Loss Protection |
Product FAQs
8 answersWhat does the U44X suffix indicate on the LLA36400U44X?
The U44X suffix designates a Micrologic 6.3 A electronic trip unit. It provides LSIG (Long-Time, Short-Time, Instantaneous, and Ground-Fault) protection along with integrated ammeter capabilities for current monitoring.
Does the LLA36400U44X require a neutral current transformer for 4-wire systems?
Yes. Because this breaker includes ground-fault protection, installing it in a 3-phase, 4-wire system requires an external neutral current transformer to accurately monitor neutral currents and prevent nuisance tripping.
How much mounting space does this L-Frame breaker require in an I-Line panelboard?
PowerPacT L-Frame circuit breakers require 6 inches of mounting space in an I-Line panelboard or switchboard.
Are the load lugs factory installed on the LLA36400U44X?
Yes, this breaker comes with factory installed mechanical lugs on the load side. They accept two 2/0 AWG to 500 kcmil aluminum or copper conductors per phase. The line side features the I-Line plug-in jaw connections.
Can I add auxiliary contacts or a shunt trip to this breaker?
Yes, the PowerPacT L-Frame series supports a full range of field installable internal accessories, including auxiliary switches, alarm switches, and shunt trips. These are installed under the front accessory cover.
Is the LLA36400U44X rated for 100 percent continuous current?
No, this breaker is standard 80 percent rated. For continuous loads lasting 3 hours or more, the load must not exceed 320 amps, which is 80 percent of its 400A rating.
Can the LLA36400U44X be reverse fed?
No. I-Line circuit breakers feature plug-in jaws on the line side and mechanical lugs on the load side, making them physically incompatible with reverse feed applications.
How do I identify if the LLA36400U44X has tripped?
The breaker features an over-center toggle mechanism. When it trips due to an overcurrent or ground fault, the handle snaps to a center position, providing a clear visual indication that the circuit has opened.
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