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Square D LAL26400MB Molded Case Circuit Breaker
- 400A
- 2 Pole
- Unit Mount
Square D
LAL26400MB
Molded Case Circuit Breaker
Brand
Square D
SKU
LAL26400MB
Quantity
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Square D LAL26400MB - 400A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D LAL26400MB - 400A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | LAL26400MB |
| Series | LAL |
| Amperage | 400A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Panelboards, Switchboards, Enclosures |
| 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 | Short Handle |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Quantity
Square D LAL26400MB - 400A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | LAL26400MB |
| Series | LAL |
| Amperage | 400A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Panelboards, Switchboards, Enclosures |
| 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 | Short Handle |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
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Description
Featuring a specialized short handle, the Square D LAL26400MB is a 2-pole, 400-amp molded case circuit breaker. The "MB" suffix designates a modified handle design that ensures proper clearance so panel doors can close securely in space-constrained applications. This unit-mount breaker installs into compatible panelboards, switchboards, and enclosures. It serves as a replacement for legacy L-Frame installations. The breaker provides thermal-magnetic protection with a 42 kAIC rating at 240V.Specifications
| Brand | Square D |
|---|---|
| Part Number | LAL26400MB |
| Series | LAL |
| Amperage | 400A |
| Poles | 2 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | LAL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Panelboards, Switchboards, Enclosures |
| 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 | Short Handle |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
6 answersWhat does the MB suffix mean on the Square D LAL26400MB?
The MB suffix indicates that the circuit breaker is equipped with a short handle. This specialized actuator design ensures that panel doors can close securely without interference, which is often required when the breaker is installed in a main breaker position.
What wire sizes are compatible with the lugs on the LAL26400MB?
The factory-installed lugs on this 400A breaker accept either one 1 AWG to 600 kcmil conductor or two 1 AWG to 250 kcmil conductors per phase. The terminals are rated for both aluminum and copper (Al/Cu) wiring.
Can the trip settings be adjusted on the LAL26400MB?
Yes, this thermal-magnetic circuit breaker features an adjustable magnetic trip for instantaneous short-circuit protection. The thermal overload protection (long-time) is fixed at the 400A rating.
What types of equipment is the LAL26400MB compatible with?
This unit-mount, feed-thru L-Frame breaker is designed for installation in compatible Square D industrial enclosures, switchboards, and panelboards.
Is the LAL26400MB suitable for DC voltage systems?
Yes, in addition to its AC ratings, this 2-pole breaker is rated for up to 250VDC with a 10kA interrupting capacity, allowing it to be used in specific direct current applications.
How can I safely test the mechanical operation of the LAL26400MB?
This breaker includes a push-to-trip button on the faceplate. This feature allows you to manually trip the breaker to verify the mechanical operation of the trip mechanism without exposing yourself to live electrical parts.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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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.