Square D LAL34225MC1021 Molded Case Circuit Breaker
- 225A
- 3 Pole
- Unit Mount
Quantity
Square D LAL34225MC1021 - 225A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Supplying advanced thermal-magnetic protection, the Square D LAL34225MC1021 is a 3-pole, 225A molded case circuit breaker. It is engineered to safeguard mission critical loads in industrial facilities. This unit mount L-Frame breaker installs into standard panelboards and switchboards. It accepts a wide range of wire gauges via reliable lug terminals for secure connections. The "MC" designation indicates mission critical calibration to prevent nuisance tripping.Specifications
| Brand | Square D |
|---|---|
| Part Number | LAL34225MC1021 |
| Series | LAL |
| Amperage | 225A |
| 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 | Mission Critical Loads, Panelboards, 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 | Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Shunt Trip (120/240VAC) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Mission Critical Calibration, HACR Rated |
Product FAQs
6 answersWhat does the "MC" suffix mean in the LAL34225MC1021 catalog number?
The "MC" suffix stands for Mission Critical calibration. Breakers with this specialized calibration are engineered to coordinate closely with downstream breakers. This ensures that a localized fault trips only the nearest downstream device rather than the main breaker, maximizing system uptime.
What does the "1021" suffix indicate on this Square D LAL breaker?
The "1021" suffix denotes a factory-installed 120/240VAC shunt trip accessory. This allows the breaker to be opened remotely via a control signal, which is commonly used for emergency stops, fire alarm integration, or automated control systems.
What are the wire size requirements for the LAL34225MC1021 lugs?
The factory lugs on this L-frame breaker accommodate either one 1 AWG to 600 kcmil wire or two 1 AWG to 250 kcmil wires per phase. They are compatible with both aluminum and copper conductors.
Can I install the LAL34225MC1021 directly onto a Square D I-Line panelboard bus?
No. The LAL34225MC1021 is a unit-mount, feed-thru circuit breaker designed for standard bolt-on or cabled installations. It lacks the plug-on jaw connections required for direct mounting in an I-Line distribution panel.
Is the trip unit on the LAL34225MC1021 adjustable?
The thermal (long-time) protection is fixed at 225 amps, but the magnetic (instantaneous) trip function is adjustable. This allows electricians to fine-tune the short-circuit response to properly coordinate with other protective devices in the electrical system.
Can this 480V breaker be used on a 240V system?
Yes. While it has a maximum voltage rating of 480VAC, it is fully compatible with 240VAC systems. When applied at 240VAC, the interrupting capacity (AIC) increases to 42kA, compared to its 30kA rating at 480VAC.
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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.