Square D KA36250 Molded Case Circuit Breaker

This unit is engineered specifically for Square D I-Line panelboards and switchboards. It will not fit in standard QO, NQ, or NF series panels, which require completely different mounting hardware and breaker profiles.

It utilizes an I-Line plug-on connection for the line side, which snaps directly onto the panelboard bus assembly. The load side features traditional mechanical lugs for outbound wiring.

The legacy K-frame series has been superseded by the Square D PowerPact J-frame. The modern I-Line equivalent is typically the JGA36250, which upgrades the design while maintaining plug-on compatibility with your existing I-Line bus.

The long-time thermal overload protection is completely fixed. However, the adjustable magnetic dial allows you to modify the instantaneous trip threshold. This is critical for coordinating with downstream protection devices or preventing nuisance tripping from motor inrush currents.

Yes. While this model provides standard interrupting capacities, you can step up to the KH36250 for high interrupt applications or the KC36250 for extra-high fault current requirements without altering the physical footprint in the panel.

Yes, it provides DC overcurrent protection for up to 250VDC systems. This makes it suitable for specific industrial DC drives, control circuits, or ungrounded battery backup layouts that fall within its fault rating.

No. The factory-installed mechanical lugs are dual-rated for both aluminum and copper conductors. You can land aluminum directly without purchasing a separate lug kit, provided you use the proper antioxidant compound and follow standard torque specifications.

No. Because it relies on I-Line plug-on jaws exclusively for the line connection and uses mechanical lugs for the load, this specific breaker configuration cannot be reverse fed safely or properly.