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Square D KI36150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- I-Line
Square D
KI36150
Molded Case Circuit Breaker
Brand
Square D
SKU
KI36150
Quantity
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Square D KI36150 - 150A 3 Pole Molded Case Circuit Breaker
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Description
A reliable solution for legacy systems, this 3-pole 150A circuit breaker belongs to the Square D K-Frame family. It delivers high-capacity, current-limiting protection with a 200kAIC rating at 480VAC. The thermal-magnetic trip unit includes an adjustable magnetic range of 750A to 1500A. It mounts into standard I-Line panelboards via a plug-on connection. For facilities upgrading their infrastructure, this model crosses over to the newer PowerPact JRA36150.Specifications
| Brand | Square D |
|---|---|
| Part Number | KI36150-R |
| Series | KI |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480Y/277VAC, 200kA @ 480VAC, 100kA @ 600Y/347VAC, 100kA @ 600VAC |
| Frame Type | KI |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| 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 | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated |
Product FAQs
8 answersWhat panelboards are compatible with the KI36150 circuit breaker?
This breaker is designed primarily for plug-in installation in Square D I-Line panelboards and switchboards. It can also be used as a main breaker in NQ panelboards when paired with the appropriate K-Frame adapter kit.
How does the I-Line plug-in connection work on the KI36150?
The breaker features plug-on jaws that connect directly to the busbar stack of an I-Line panelboard. It is then secured with a retaining bracket and screw, which eliminates the need for separate line-side cable connections and speeds up installation.
Does the KI36150 require a separate mounting hardware kit?
For standard I-Line panelboard installations, no separate mounting hardware is required. The breaker features an integrated plug-on jaw and captive retaining screw that secure it directly to the panel's mounting pan.
What does the "LI" trip function indicate on this breaker?
The "LI" designation means the thermal-magnetic trip unit provides Long-Time (L) and Instantaneous (I) protection. The thermal element offers fixed overload protection, while the magnetic instantaneous trip is adjustable to coordinate short-circuit protection.
What is the maximum frame rating for the KI36150?
The KI36150 is built on the Square D K-Frame, which has a maximum capacity of 250 amps. However, this specific model is factory-calibrated for a 150-amp continuous current rating.
What wire sizes and materials are accepted by the KI36150 lugs?
The factory lugs are rated for 4 AWG to 350 kcmil aluminum or copper conductors. Installers must ensure the conductors are properly torqued to the specifications listed on the breaker faceplate to prevent thermal issues.
Is the Square D KI frame still actively manufactured?
The KI frame is a legacy molded case circuit breaker that has been discontinued by the manufacturer. While it remains widely used in existing systems, modern replacements typically utilize Square D PowerPact breakers, which may require different mounting space or hardware.
Does the KI36150 provide equipment ground fault protection?
No. This breaker is equipped with a standard thermal-magnetic trip unit for overload and short-circuit protection only. It does not include integrated ground fault protection capabilities.
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