Square D LAL34225MC1212 Molded Case Circuit Breaker
- 225A
- 3 Pole
- Unit Mount
Square D
LAL34225MC1212
Molded Case Circuit Breaker
Brand
Square D
SKU
LAL34225MC1212
Quantity
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Square D LAL34225MC1212 - 225A 3 Pole Molded Case Circuit Breaker
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Description
Delivering robust performance, the Square D LAL34225MC1212 is a 3-pole, 225A molded case circuit breaker. It provides reliable protection for industrial systems requiring high magnetic withstand. This unit mount L-Frame breaker installs into compatible panelboards and switchboards. The lug terminals accommodate aluminum and copper wiring for versatile integration. The "MC" prefix signifies mission critical calibration. The "1212" suffix adds a 1A/1B auxiliary switch for status signaling.Specifications
| Brand | Square D |
|---|---|
| Part Number | LAL34225MC1212 |
| 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, Switchboards, Panelboards |
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Auxiliary Switch |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
7 answersWhat do the MC and 1212 suffixes indicate on the LAL34225MC1212?
The MC suffix denotes mission critical calibration, optimizing the breaker for mission critical loads. The 1212 suffix indicates the inclusion of a factory-installed 1A/1B auxiliary switch (one normally open and one normally closed contact) for remote status signaling.
What wire sizes and materials are compatible with the lugs on this breaker?
The factory lugs accommodate either a single 1 AWG to 600 kcmil wire or dual 1 AWG to 250 kcmil wires per phase. Both aluminum and copper conductors are supported.
Is the LAL34225MC1212 an I-Line or unit-mount breaker?
This is a unit-mount (feed-thru) breaker. It is designed to be bolted to a mounting pan or chassis and wired via lugs on both the line and load sides, unlike I-Line breakers which plug directly onto a panelboard bus.
How does the trip unit function on the LAL34225MC1212?
It utilizes a thermal-magnetic trip unit with LI (Long-Time and Instantaneous) functions. The thermal element provides fixed overload protection, while the magnetic instantaneous trip is adjustable to allow coordination with other devices in the system.
Can I use this breaker to replace an older Square D LAL breaker with the same specifications?
Yes, it shares the same physical dimensions and mounting footprint as standard Square D L-Frame unit-mount breakers, making it a direct replacement for older LAL models with matching amperage and voltage requirements.
Does this breaker provide ground fault protection?
No, the LAL34225MC1212 features standard LI (Long-Time and Instantaneous) trip functions for overload and short-circuit protection. It does not include integral ground fault or equipment ground fault protection.
Are line and load lugs included with this breaker?
Yes, this feed-thru breaker comes equipped with factory-installed lugs on both the line and load sides, ready for conductor termination.
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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.