Square D JGL36250U31X Molded Case Circuit Breaker

The U31X suffix specifies that the breaker is equipped with a MicroLogic 3.2 electronic trip unit, providing standard Long-Time and Instantaneous (LI) protection without an advanced LCD ammeter display.

The breaker comes factory-equipped with AL250JD mechanical lugs, which accept one 3/0 AWG to 350 kcmil aluminum or copper wire per phase.

The standard AL250JD lugs require a tightening torque of 225 lb-in (25 N-m), which must be adjusted using a 5/16-inch hex bit.

Yes. PowerPacT J-Frame 3-pole breakers with standard MicroLogic U31X trip units are marked and approved for single-phase use on 240VAC systems. You can utilize any two poles for the connection.

Yes. The integrated MicroLogic 3.2 trip unit features physical rotary dials that allow you to customize both the long-time pickup (Ir) and the instantaneous pickup (Ii) to meet your specific system coordination requirements.

Yes. PowerPacT J-Frame unit-mount breakers with factory-sealed MicroLogic trip units are approved for reverse connection (reverse feeding).

The "L" in the JGL prefix indicates a unit-mount configuration with mechanical lugs on both the line and load sides. A JGA configuration designates an I-Line plug-on connection, which is incompatible with standard backpans and designed specifically for Square D I-Line panelboards.

No. The U31X suffix signifies an LI trip function code, meaning it provides only Long-Time and Instantaneous protection. If your coordination study requires Short-Time protection (LSI), a U33X trip unit configuration is required instead.