Square D LAL364001021 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
Square D LAL364001021 - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for commercial and industrial power distribution, the Square D LAL364001021 is a 3-pole, 400A thermal-magnetic circuit breaker. It delivers reliable long-time and instantaneous (LI) protection for demanding electrical systems. This unit-mount MCCB installs into Square D switchboards, panelboards, and enclosures. Rated at 30kAIC at 480VAC, it includes a factory-installed 120-240VAC shunt trip accessory.Specifications
| 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 | 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 | Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Shunt Trip |
| 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 |
Product FAQs
6 answersWhat does the 1021 suffix indicate on the LAL364001021 circuit breaker?
The 1021 suffix means this breaker includes a factory-installed 120-240VAC shunt trip. This accessory allows the breaker to be opened remotely via a separate control signal.
What are the wire size requirements for the lugs on this breaker?
The factory lugs accept either a single 1 AWG to 600 kcmil wire or two 1 AWG to 250 kcmil wires per phase. The terminals are rated for both aluminum and copper conductors.
Can the LAL364001021 be installed in a Square D I-Line panelboard?
No. This is a unit-mount circuit breaker designed for feed-thru lug connections. It does not have the plug-on jaws required for I-Line panelboard installations.
How does the trip unit operate on this L-Frame breaker?
It utilizes a thermal-magnetic trip unit that provides fixed thermal protection for long-time overloads and an adjustable magnetic setting for instantaneous short-circuit protection.
Is the LAL364001021 a direct replacement for older LA series breakers?
Yes, the LAL catalog number indicates a legacy L-Frame breaker with factory lugs. It serves as a direct physical and electrical replacement for older LA frame breakers with matching amperage and voltage.
How can the mechanical trip linkage be tested safely?
The breaker includes a push-to-trip feature on the front face. Pressing this button manually trips the breaker mechanism to verify proper operation without requiring exposure to live electrical parts.
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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.