Square D KAL36225-1039 Molded Case Circuit Breaker

The -1039 suffix means this circuit breaker is equipped with a factory-installed 12VDC shunt trip. This accessory allows the breaker to be tripped remotely by applying a 12-volt direct current signal to the shunt trip coil.

No. Legacy K-frame breakers like the KAL series require internal accessories to be factory-installed. Because this unit already contains a factory-installed 12VDC shunt trip, modifying the internal components in the field is not recommended and may void safety listings.

The KAL36225 is a unit mount breaker, meaning it uses lugs on both the line and load sides and bolts directly to a backpan or enclosure. The KA36225 is the I-Line version, which features a plug-on jaw connection on the line side for quick installation onto an I-Line panelboard bus.

This K-frame molded case circuit breaker is designed for use in standard Square D enclosures, switchboards, and motor control centers that accept unit mount (lug-to-lug) breakers.

This breaker features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection. The magnetic trip threshold can be tuned to coordinate with other protective devices in your system.

The factory-installed lugs accept either aluminum or copper conductors ranging from 4 AWG to 350 kcmil. Ensure you use the proper torque specifications listed on the breaker faceplate when securing the conductors to prevent overheating.

The Square D KAL series is a legacy K-frame product line that has been largely superseded by newer PowerPact H and J-frame breakers. However, KAL breakers remain widely used for exact replacements in existing switchboards and motor control centers where retrofitting a newer frame is not feasible.

No, the KAL36225-1039 is equipped with a standard thermal-magnetic trip unit (LI) for overload and short-circuit protection. It does not have integrated ground fault (LSIG) sensing. If ground fault protection is required, an external ground fault relay and sensor system must be used.

When the breaker trips, the handle will move to a center position. To restore power, first resolve the fault condition. Then, push the handle firmly to the OFF position to reset the internal mechanism before pushing it back to the ON position.