Square D LGA36400U31X Molded Case Circuit Breaker

This PowerPacT L-frame circuit breaker uses an I-Line mounting bracket. It is designed exclusively to plug directly into the bus system of Square D I-Line panelboards and switchboards.

The factory-installed mechanical lugs on the load side are rated for both aluminum and copper wire. They accept two conductors per phase, with an allowable wire range of 2/0 AWG to 500 kcmil.

The MicroLogic 3.3 is a solid-state electronic trip unit that delivers standard LI protection. This includes fully adjustable Long-Time and Instantaneous trip functions, relying on true RMS sensing for precise current monitoring.

The primary difference is the termination type. The LGA model features an I-Line plug-on connection on the line side for direct bus mounting. In contrast, the LGL model is a unit-mount breaker equipped with mechanical lugs on both the line and load ends.

Yes, Square D permits the use of 3-pole PowerPacT L-frame breakers equipped with MicroLogic trip units in single-phase applications. However, they are strictly limited to 240VAC circuits. Any two poles can be utilized for the connection.

The G in the LGA prefix designates a standard G-tier interrupting capacity. This yields a short-circuit rating of 65kA at 240VAC, 35kA at 480VAC, and 18kA at 600VAC.

No. Because this is an I-Line mounted breaker with a specific plug-on jaw connection for the line side bus and mechanical lugs for the load side, it cannot be reverse fed.

The U31X suffix indicates that the breaker is equipped with a MicroLogic 3.3 electronic trip unit. This specific unit offers standard long-time and instantaneous (LI) adjustments without advanced energy metering or ground fault capabilities.