Square D KAL36125G Molded Case Circuit Breaker

The "G" suffix indicates that the breaker includes a factory-installed ground fault shunt trip. This feature is designed to interface with a ground fault module (GFM) or legacy GP system to provide equipment ground fault protection.

The KAL frame is a legacy Square D product. For modern applications, it is functionally replaced by the PowerPact H-Frame series, such as the HGL36125. Note that upgrading to a PowerPact breaker may require different mounting hardware or enclosure modifications due to dimensional differences.

No. The KAL36125G is a unit mount, feed-thru breaker designed for bolt-on installation in standard enclosures, switchboards, and motor control centers. I-Line panelboards require a plug-on I-Line breaker, such as the legacy KIL series or a modern PowerPact I-Line equivalent.

The "LI" designation stands for Long-Time and Instantaneous trip functions. The thermal magnetic trip unit provides a fixed thermal response for overload protection (Long-Time) and an adjustable magnetic response for short-circuit protection (Instantaneous).

The adjustable magnetic trip allows you to fine-tune the instantaneous short-circuit response of the breaker. This is critical for coordinating with downstream loads, such as high inrush currents from motors, to prevent nuisance tripping while still providing robust fault protection.

No. The KAL36125G is an industrial K-Frame molded case circuit breaker designed for heavy-duty switchboards, motor control centers, and large enclosures. It is physically too large and incompatible with standard residential QO or Homeline load centers.

This breaker typically uses AL250KA lugs on both the line and load sides. These lugs accept aluminum or copper conductors ranging from 4 AWG to 350 kcmil. Always verify the required torque specifications printed on the breaker faceplate prior to terminating the wires.

Yes. This breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment. It provides the necessary overcurrent and short-circuit protection required for these specific motor loads.