Square D KAL36125-1027 Molded Case Circuit Breaker

The -1027 suffix denotes a factory-installed 24VDC shunt trip. This allows the breaker to be tripped remotely from a control circuit, which is commonly used for emergency power-off, fire alarm interlocks, and remote shutdown applications.

The Square D K-Frame is a legacy product. The modern functional equivalent is a PowerPact H-Frame breaker, such as the HGL36125, paired with a 24VDC shunt trip accessory like the S29390. Upgrading to the PowerPact series will require different mounting hardware or retrofit kits depending on your switchboard or enclosure.

No. The KAL36125-1027 is a unit mount, feed-thru circuit breaker designed for QED switchboards, motor control centers, and individual enclosures. It does not have the plug-on jaw connections required for I-Line distribution panels.

The factory-installed shunt trip requires a dedicated 24VDC control power source. When a 24VDC signal is applied to the shunt trip coil leads, it mechanically trips the breaker to open the circuit. The plain KAL36125 does not include this feature and cannot be substituted if a 24VDC remote trip is required.

This breaker features a fixed thermal element for long-time overload protection, which cannot be changed. However, the magnetic element for instantaneous short-circuit protection is adjustable via a dial on the front of the trip unit, allowing you to fine-tune the response to inrush currents.

Yes, like most Square D molded case circuit breakers, this unit includes a push-to-trip button on the front face. This allows electricians to manually trip the breaker to verify the mechanical operation of the trip mechanism without exposing themselves to live parts.