Square D KCL34150-1021 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Unit Mount
Quantity
Square D KCL34150-1021 - 150A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for commercial and industrial power distribution, the Square D KCL34150-1021 is a 3-pole, 150A molded case circuit breaker. It provides reliable thermal-magnetic protection with long-time and instantaneous trip functions. This unit-mount breaker installs into Square D enclosures and switchboards. As a legacy K-Frame device, it is commonly replaced by the modern PowerPacT J-Frame series. Rated for 65kAIC at 480VAC, this model includes a factory-installed 120-240VAC shunt trip.Specifications
| Brand | Square D |
|---|---|
| Part Number | KCL34150-1021 |
| 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, Padlock Attachment, Motor Operator |
|---|---|
| Accessories | Line and Load Lugs (AL250KA), Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Extra High Interrupting Capacity, HACR Rated, Trip-Free Mechanism |
Product FAQs
6 answersIs the Square D KCL34150-1021 still actively manufactured?
The KCL frame is a legacy molded case circuit breaker. It has been discontinued and replaced by the newer PowerPact J-Frame series. However, exact replacements like the KCL34150-1021 are still sourced to maintain existing panelboards without requiring a complete system upgrade.
What does the -1021 suffix indicate on this KCL breaker?
The -1021 suffix signifies that the circuit breaker includes a factory-installed 120/240V AC shunt trip. This accessory allows the breaker to be tripped remotely by applying voltage to the shunt trip coil.
What type of panels accept the KCL34150-1021?
This unit-mount breaker is designed for use in compatible Square D enclosures, switchboards, and traditional panelboards. It features a feed-thru connection with line and load side lugs, meaning it mounts directly rather than plugging into an I-Line busway.
What does the L in the KCL frame designation mean?
In Square D nomenclature, the L in KCL indicates that it is a unit-mount breaker with lugs on both the line and load sides. This distinguishes it from I-Line plug-in breakers, which feature a jaw connection on the line side for busway mounting.
What wire sizes are supported by the lugs on this 150A breaker?
The factory-installed line and load side lugs accept wire gauges from 4 AWG up to 350 kcmil. The terminals are rated for both aluminum and copper conductors.
How is the trip unit configured on the KCL34150-1021?
This thermal-magnetic breaker features a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection. The magnetic trip can be tuned to coordinate with other devices in your distribution system.
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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!
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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