Square D LAL34400MC1380 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
Square D LAL34400MC1380 - 400A 3 Pole Molded Case Circuit Breaker
New
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Description
Part of the legacy L-Frame series, the Square D LAL34400MC1380 is a 3-pole, 400A molded case circuit breaker. It is engineered with mission critical calibration to support high magnetic withstand in data centers and healthcare facilities. This unit mount breaker installs into Square D industrial enclosures. While widely used, it is often replaced by the modern PowerPacT L-Frame series (like the LJL36400). The "1380" suffix denotes a factory-installed 120VAC shunt trip and 1A/1B auxiliary switch.Specifications
| Brand | Square D |
|---|---|
| Part Number | LAL34400MC1380 |
| Series | LAL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC |
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Industrial Enclosures, Switchboards, Mission Critical Systems |
| Wire Gauge | (1) 1 AWG-600 kcmil (Al/Cu) or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Auxiliary Switch (Factory Installed), Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Mission Critical Calibration, Visual Trip Indicator |
Product FAQs
8 answersWhat does the MC suffix in the LAL34400MC1380 catalog number signify?
The MC indicates Mission Critical calibration. This provides a higher magnetic withstand capability, making the breaker suitable for data centers, healthcare facilities, and other applications with high inrush currents.
What accessories are included with the 1380 suffix on this breaker?
The 1380 suffix denotes that the breaker comes equipped with a factory-installed 120VAC shunt trip and a 1A/1B auxiliary switch.
Is there a modern replacement for the legacy LAL34400MC1380 circuit breaker?
Yes, while the legacy L-Frame is still widely used, it is frequently upgraded to the modern Square D PowerPacT L-Frame series, such as the LJL36400, depending on the specific interrupting rating required.
What wire sizes are accepted by the lugs on the LAL34400MC1380?
The included line and load lugs accept either one 1 AWG to 600 kcmil aluminum or copper wire, or two 1 AWG to 250 kcmil aluminum or copper wires per phase.
What types of equipment is the LAL34400MC1380 compatible with?
This unit-mount, feed-thru circuit breaker is designed for installation in Square D industrial enclosures, switchboards, and mission-critical power distribution systems.
Is the trip unit on the LAL34400MC1380 adjustable?
Yes, it features a thermal-magnetic trip unit with a fixed thermal long-time setting and an adjustable magnetic instantaneous trip function to accommodate specific load profiles.
Does the LAL34400MC1380 include a visual trip indicator?
Yes, this breaker features a visual trip indicator to quickly identify a tripped condition in the panel, enhancing safety and troubleshooting speed.
Is the LAL34400MC1380 suitable for HVAC applications?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 7 reviews.
- MBmike b.Verified BuyerReviewingSquare D LAL36350 - 350A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/15/26LAL36350MB
OLINE ORDERING WAS EASY AND I RECEIVED THE BREAKER QUICKLY
- GCGlenn C.Verified BuyerReviewingSquare D LAL36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/27/26Breaker
I like the great price. Great service
- MIMarietta I.Verified BuyerReviewingSquare D LAL36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/27/26Great service
Received the breakers in time. My account mgr Mike is awesome.
- TBTerry B.Verified BuyerReviewingSquare D LAL36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/5/26RECERTIFIED BREAKER
Breaker was received in good condition and seems to work correctly
- LBLISA B.Verified BuyerReviewingSquare D LAL36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/28/25good [product
Expeditious delivery, great product and amazing customer service.