Square D LJL36400U31X Molded Case Circuit Breaker

The "J" indicates the breaker's interrupting capacity tier within the PowerPacT L-Frame series. For this model, the J-tier provides high interrupting ratings of 100kA at 240VAC, 65kA at 480VAC, and 25kA at 600VAC.

No. The LJL36400U31X is a unit mount circuit breaker configured with lugs on both the line and load sides. For I-Line panelboard installations, an I-Line specific breaker, such as an LJA model, is required.

Yes, the LJL36400U31X comes standard with factory installed line and load lugs designed for a unit mount feed-through connection. These lugs accept two conductors per phase, ranging from 2/0 AWG to 500 kcmil, and are rated for use with both aluminum and copper wire.

This breaker features a Micrologic 3.3 solid-state electronic trip unit. The "U31X" in the catalog number designates this specific trip unit, which provides Long-Time and Instantaneous (LI) protection capabilities.

Yes. The integrated Micrologic 3.3 trip unit includes rotary dials on the face of the breaker. These allow you to precisely coordinate the continuous current pickup, long-time delay, and instantaneous pickup values with your specific load and coordination requirements.

It is part of the Square D / Schneider Electric PowerPacT L-Frame family. L-Frame breakers share standardized footprint dimensions and accessory compatibility for commercial and industrial applications up to 600A.

No, this breaker carries a standard 80% continuous current rating. For applications requiring a 100% rating, a different breaker catalog number featuring a "C" prefix before the trip unit designation (such as LJL36400CU31X) is required.