Square D KAB36250 Circuit Breaker
- 250A
- 3 Pole
- I-Line
Quantity
Square D KAB36250 3 Pole Circuit Breaker
Re-Certified
Quantity
Description
Square D KAB36250 3 Pole Circuit Breaker
The Square D KAB36250 is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 250 Amps and a voltage rating of 600VAC. It has an interrupting rating of 25kAIC at 480V. The KAB36250 has an I-Line style bolt-on connection type and includes long time and instantaneous trip functions.
Specifications
| Brand | Square D |
|---|---|
| Series | KAB |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 25kA @ 480Y/277VAC, 25kA @ 480VAC, 22kA @ 600Y/347VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | K |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 4 AWG - 350 kcmil |
| 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 |
| Temp Rating | 40 °C |
|---|
Product FAQs
6 answersIs the Square D KAB36250 still in active production?
No, the KAB36250 is an obsolete legacy K-Frame breaker. Square D has superseded the K-Frame line with the modern PowerPacT J-Frame series (such as the JGA36250). Mounting, dimensions, and required interrupting capacity must be evaluated before upgrading.
What enclosures and panels are compatible with the KAB36250?
This breaker is engineered specifically for Square D I-Line panelboards, commercial switchboards, and motor control centers that accommodate K-Frame footprint breakers.
What wire sizes do the load lugs on the KAB36250 accept?
The standard load-side lugs on this 250A breaker accommodate #4 AWG through 350 kcmil copper or aluminum conductors.
What are the complete interrupting ratings for this breaker?
Beyond the 25kAIC rating at 480VAC, the KAB36250 provides a 42kAIC interrupting capacity at 240VAC and 22kAIC at 600VAC.
Is the trip unit on the KAB36250 adjustable?
Yes, it features a thermal-magnetic trip unit with fixed thermal (long-time) protection and an adjustable magnetic (instantaneous) trip setting. This allows panel builders to coordinate short-circuit protection with downstream devices.
How does the I-Line style bolt-on connection work?
Unlike standard I-Line breakers that use a friction plug-on jaw assembly, the KAB series utilizes a bolt-down crown configuration. This bolts directly to the I-Line bus, providing a high-retention mechanical connection for high-vibration or demanding industrial environments.
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