Square D LGA36600U31X Molded Case Circuit Breaker

This molded case circuit breaker is designed exclusively for mounting in Square D I-Line panelboards and switchboards. The line side features a plug-in connection that attaches directly to the I-Line bus, while the load side uses standard mechanical lugs.

No, this is a dedicated I-Line style breaker. It will not mount on DIN rails or in standard unit-mount basepans. Unit-mount applications require a different breaker configuration, typically starting with "LGL" instead of "LGA".

No, this breaker has a standard 80% continuous current rating. According to the National Electrical Code, the continuous load must not exceed 80% of the 600A rating (480A) for loads lasting three hours or longer.

Yes. The MicroLogic 3.3 electronic trip unit features adjustable dials for both the Long-Time (Ir) and Instantaneous (Ii) protection functions, allowing licensed electricians to coordinate the breaker with specific electrical system demands.

Yes, standard mechanical lugs are factory installed on the load side. The line side features the I-Line plug-in connection, meaning no line side lugs are required or included.

In the Square D PowerPact nomenclature, "L" designates the L-Frame family, "G" indicates the specific interrupting rating tier (65kA at 240V, 35kA at 480V, 18kA at 600V), and "A" specifies the I-Line plug-in mounting style for the line side.

No, the U31X suffix indicates a MicroLogic 3.3 standard trip unit that provides only Long-Time and Instantaneous (LI) protection. If Short-Time (LSI) or Ground Fault (LSIG) functions are required, a different trip unit configuration, such as the U33X or U44X, is necessary.

No, the standard MicroLogic 3.3 trip unit on the LGA36600U31X does not include a built-in ammeter or advanced energy management. Upgraded trip units, designated by a U43X or U53X suffix, are required for on-device current and power metering.

The solid-state MicroLogic trip unit utilizes true RMS sensing, providing highly accurate protection against overloads and instantaneous faults. This remains accurate even in electrical systems with significant harmonic distortion from variable frequency drives or electronic loads.