Square D KCL341501021 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Unit Mount
Quantity
Square D KCL341501021 - 150A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for demanding industrial environments, the Square D KCL341501021 is a 3-pole, 150A molded case circuit breaker. It features fixed thermal and adjustable magnetic trip settings to protect against overloads and short circuits. This unit-mount device installs into Square D switchboards and enclosures. As part of the legacy K-Frame family, it is typically replaced by the PowerPacT J-Frame series when upgrading facility infrastructure. It includes a factory-installed 120-240VAC shunt trip.Specifications
| Brand | Square D |
|---|---|
| Series | KCL |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC |
| Frame Type | KCL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Enclosures, Switchboards, Panelboards |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 4 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 | Lugs (AL250KA), Shunt Trip |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Extra High Interrupting Capacity, Trip-Free Mechanism, Quick-Make/Quick-Break |
Product FAQs
7 answersWhat does the 1021 suffix mean on the KCL341501021?
The 1021 suffix indicates that this circuit breaker includes a factory-installed 120/240VAC shunt trip. This allows the breaker to be tripped remotely by applying a voltage signal to the shunt trip coil.
How does the KCL series differ from KAL and KHL breakers?
The second letter in the Square D K-frame catalog number indicates the interrupting capacity. The KCL series features an extra-high interrupting rating of 65kA at 480V. KAL (standard) and KHL (high) models have lower interrupting ratings but share the exact same physical K-frame dimensions.
Can I install the KCL341501021 in an I-Line panelboard?
No. The KCL341501021 is a unit-mount, feed-thru circuit breaker designed to be mounted with hardware and wired with lugs on both the line and load sides. I-Line panelboards require plug-on breakers with an I-Line mounting bracket.
Is the trip unit on the KCL341501021 fully adjustable?
No, the thermal-magnetic trip unit has a fixed thermal element for long-time overload protection. However, the magnetic element for instantaneous short-circuit protection is adjustable, allowing you to fine-tune the trip response for your specific load.
Can this 480V breaker be used on a 240V system?
Yes. While it is rated for a maximum of 480VAC, it is fully compatible with 240V systems. When applied at 240VAC, the interrupting capacity increases to 100kAIC.
What does the L in the KCL341501021 catalog number represent?
In Square D legacy molded case circuit breakers, the L indicates that the breaker is supplied with lugs on both the line and load ends for feed-thru wiring.
Do I need to use specific torque settings when wiring the KCL341501021?
Yes. Always use a calibrated torque wrench when terminating the line and load lugs. The exact torque specifications are printed directly on the faceplate or side label of the breaker. Improper torque can lead to overheating and thermal damage.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 5 reviews.
- BWBrian W.Verified BuyerReviewingSquare D KCL34125 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/27/26Great!
Quick delivery
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- BWBrian W.Verified BuyerReviewingSquare D KCL34225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/27/26Works perfect
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- BWBrian W.Verified BuyerReviewingSquare D KCL34250 - 250A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/24/26Great Service!
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- JFJ F.Verified BuyerReviewingSquare D KCL34150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars5/8/26Breakers are right
I thought I was getting a tshirt too. But, alas, no