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Square D LAL36400MB Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Square D
LAL36400MB
Molded Case Circuit Breaker
Brand
Square D
SKU
LAL36400MB
Quantity
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Square D LAL36400MB - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LAL36400MB - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LAL36400MB |
| Series | LAL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Industrial Enclosures, Switchboards, Motor Control Centers |
| 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Lugs (AL400LA) |
| 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, Short Handle, Trip-Free Mechanism |
Quantity
Square D LAL36400MB - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Series | LAL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Industrial Enclosures, Switchboards, Motor Control Centers |
| 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Lugs (AL400LA) |
| 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, Short Handle, Trip-Free Mechanism |
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Description
Engineered for commercial applications, the Square D LAL36400MB provides robust overcurrent protection. This 3-pole, 400A unit mount MCCB integrates into industrial enclosures and switchboards. The legacy L-Frame breaker features standard lugs and a short handle. It is replaced by the PowerPacT LGL36400, requiring handle clearance verification. Rated 30kAIC at 480VAC, it utilizes an adjustable magnetic trip for precise LI protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | LAL36400MB |
| Series | LAL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Industrial Enclosures, Switchboards, Motor Control Centers |
| 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Lugs (AL400LA) |
| 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, Short Handle, Trip-Free Mechanism |
Product FAQs
6 answersWhat does the "MB" suffix mean in the LAL36400MB catalog number?
The "MB" suffix designates a short operating handle. This configuration is often required for clearance when installing the breaker as a main in certain shallow panelboards or switchboards where the enclosure door needs to close flush.
What type of equipment is the LAL36400MB compatible with?
This legacy L-frame unit mount circuit breaker is designed for feed-thru applications and is commonly installed in industrial enclosures, motor control centers, and compatible Square D switchboards.
What is the modern cross-reference for the legacy LAL36400MB?
The legacy LAL series is largely superseded by the newer PowerPact L-Frame series, such as the LJL36400. Because the "MB" suffix on your existing breaker indicates a short handle, you must verify enclosure depth and door clearance when upgrading to a modern PowerPact alternative.
What size wire do the lugs on the LAL36400MB accept?
The factory-installed line and load lugs are designed to accommodate either one 1 AWG to 600 kcmil conductor or two 1 AWG to 250 kcmil conductors per phase, accepting both aluminum and copper wire.
Does the LAL36400MB provide ground fault protection?
No. This breaker is equipped with a standard thermal magnetic trip unit featuring Long-Time (L) and Instantaneous (I) protection. It does not provide integral Ground Fault (G) or Short-Time (S) trip functions.
Is the trip unit on the LAL36400MB adjustable?
The thermal (overload) trip element is fixed, but the magnetic (short circuit) trip mechanism is adjustable. This allows licensed electricians to fine-tune the instantaneous trip threshold for better selective coordination with downstream devices.
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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.