Square D LGA36400U44X Molded Case Circuit Breaker

The U44X suffix indicates this breaker is equipped with a MicroLogic 6.3 A electronic trip unit. This specific unit features an integrated ammeter for current monitoring and provides fully adjustable LSIG (Long-time, Short-time, Instantaneous, and Ground-Fault) protection.

In the Square D PowerPacT L-Frame series, the G designates the interrupting rating tier. A G-tier breaker delivers 65 kA at 240VAC, 35 kA at 480VAC, and 18 kA at 600VAC. If your system requires higher fault current limits, you would step up to a J-tier or L-tier breaker.

Yes, the MicroLogic 6.3 A trip unit allows licensed electricians to precisely configure the long-time pickup and delay, short-time pickup and delay, instantaneous pickup, and ground-fault pickup and delay to properly coordinate with system requirements.

This 3-pole PowerPacT L-Frame circuit breaker requires 6 inches of vertical mounting space on the I-Line panelboard bus.

Yes, the factory-installed mechanical load lugs are dual-rated for both aluminum and copper conductors. Each lug can accept two wires ranging from 2/0 AWG to 500 kcmil.

No, this PowerPacT L-Frame breaker features integral plug-on jaws on the line side. It is designed to snap directly onto the bus structure of an I-Line panelboard or switchboard, meaning no additional mounting brackets are required.

No, this breaker has an I-Line style plug-in connection. It is strictly compatible with Square D I-Line panelboards, such as HCN, HCM, HCP, and HCR-U, as well as I-Line switchboards. It will not fit into NQ or NF series lighting panels.

The primary difference is the short-circuit interrupting rating. The LGA (G-tier) is rated for 35 kAIC at 480VAC, while the LJA (J-tier) is a higher-rated breaker capable of 65 kAIC at 480VAC. Both breakers share the exact same physical footprint and MicroLogic 6.3 A trip unit.

Yes, the integrated MicroLogic 6.3 A trip unit includes adjustable ground-fault protection. This allows the breaker to detect and interrupt low-level ground-fault currents before they escalate, providing enhanced safety and equipment protection.