Square D LAL34400MC8041 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LAL34400MC8041
Molded Case Circuit Breaker
Brand
Square D
SKU
LAL34400MC8041
Quantity
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Square D LAL34400MC8041 - 400A 3 Pole Molded Case Circuit Breaker
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Description
Designed for robust industrial power systems, the Square D LAL34400MC8041 is a 3-pole, 400A molded case circuit breaker. It features mission critical calibration, providing a high magnetic withstand to prevent nuisance tripping. This unit mount breaker fits into Square D industrial enclosures. The "8041" suffix indicates it comes with factory-installed control wire tapped lugs, simplifying the connection of auxiliary control circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | LAL34400MC8041 |
| 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 | Industrial Enclosures, Switchboards |
| 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 | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs Included, Control Wire Taps |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Mission Critical |
Product FAQs
7 answersWhat does the MC suffix mean in the LAL34400MC8041 catalog number?
The MC designates Mission Critical calibration. This provides a high magnetic withstand to support selective coordination, ensuring the main breaker remains closed during downstream faults. It is commonly specified for data centers and healthcare facilities.
What does the 8041 suffix indicate on this Square D breaker?
The 8041 suffix indicates that the breaker is equipped with factory-installed control wire tapped lugs. This allows for the direct connection of control circuit wiring at the breaker terminals.
Can I install the LAL34400MC8041 in a Square D I-Line panelboard?
No. This is a unit mount, feed-thru circuit breaker designed for hardwired installation in industrial enclosures and switchboards. It lacks the plug-on jaw connections required for I-Line panelboards.
Is the LAL34400MC8041 a direct replacement for a standard LAL34400?
Yes. It shares the exact same physical dimensions, mounting footprint, and base 400A rating as the standard LAL34400. The addition of Mission Critical calibration and control wire taps makes it an upgraded replacement that will fit in the same enclosure space.
What modern breaker series replaces the legacy LAL34400MC8041?
While the legacy L-Frame series is still widely used and supported, Square D often replaces these with the modern PowerPacT L-Frame series, such as the LJL36400, for new installations and upgrades.
Are the trip settings adjustable on the LAL34400MC8041?
The thermal overload protection is fixed at 400 amps, but the magnetic instantaneous short-circuit trip function is adjustable. This allows electricians to fine-tune the instantaneous trip point to meet specific mission critical coordination requirements.
Does the LAL34400MC8041 provide ground fault protection?
No. This breaker features standard thermal magnetic trip functions for overload and short-circuit protection. It does not include integrated equipment ground fault protection.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 7 reviews.
Total 5 star reviews: 7 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
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.