Square D KHL361251021 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
Square D KHL361251021 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for commercial and industrial applications, the Square D KHL361251021 is a 3-pole molded case circuit breaker rated for 125 amps. This unit-mount breaker installs into compatible Square D enclosures and switchboards. As a legacy K-Frame device, it is replaced by the PowerPacT J-Frame (JJL36125) when upgrading. Delivering a 65 kAIC capacity at 240VAC, it ensures robust fault clearing. It also includes a factory-installed shunt trip mechanism for remote tripping capabilities.Specifications
| Brand | Square D |
|---|---|
| Part Number | KHL361251021 |
| Series | KHL |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Enclosures, Switchboards, Motor Control Centers |
| 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 | Line and Load Lugs (AL250KA), Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, HACR Rated, Visual Trip Indicator, Trip-Free Mechanism |
Product FAQs
7 answersWhat does the 1021 suffix indicate on the KHL361251021 catalog number?
The 1021 suffix designates that this breaker includes a factory-installed 120/240Vac shunt trip mechanism, allowing for remote tripping of the breaker in emergency shutdown or control systems.
Is the KHL361251021 still actively manufactured, or is there a modern replacement?
The Square D K-Frame is a legacy molded case circuit breaker. For new installations or complete panel upgrades, Schneider Electric replaces this series with the modern PowerPacT J-Frame. However, this KHL breaker remains a direct drop-in replacement for existing K-Frame setups.
Can I install the KHL361251021 in a Square D I-Line panelboard?
No. The KHL361251021 is a unit mount (feed-thru) circuit breaker with line and load side lug terminals. It is designed to bolt directly to the backpan of compatible Square D enclosures, switchboards, and motor control centers, not plug onto an I-Line bus.
What is the difference between the KHL361251021 and other K-Frame breakers like the KAL or KJL?
The second letter in the Square D K-Frame prefix indicates the interrupting capacity. The KHL series offers a high interrupting rating (35kA at 480VAC), whereas the KAL series is standard and the KJL series provides an extra-high interrupting capacity.
Are the trip settings on the KHL361251021 adjustable?
This thermal magnetic breaker features a fixed long-time (thermal) trip for overload protection and an adjustable instantaneous (magnetic) trip to fine-tune short-circuit response based on your specific load requirements.
Is the KHL361251021 rated for use in direct current (DC) systems?
Yes, this breaker is rated for DC applications up to 250VDC, providing a 10kA interrupting capacity at that voltage.
What size wire can be used with the lugs on the KHL361251021?
The factory-installed line and load lugs accept aluminum or copper wire ranging from 4 AWG up to 350 kcmil.
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