Square D JGA36250U33X Molded Case Circuit Breaker

The U33X suffix indicates the breaker is factory-equipped with a Micrologic 3.2S electronic trip unit. This module provides the internal hardware for the adjustable Long-time, Short-time, and Instantaneous (LSI) protection parameters.

The line side features plug-on jaws that clamp directly onto an I-Line panelboard bus stack. The load side utilizes traditional mechanical lugs that secure 3/0 AWG to 350 kcmil aluminum or copper field wiring.

Yes. The physical footprint and bus interface are standardized for Square D PowerPacT J-frame I-Line breakers. This unit can replace older thermal-magnetic variants of the same frame size, assuming LSI functionality meets your project requirements.

After the primary jaws are pushed onto the I-Line bus stack, a built-in mounting bracket on the load end of the breaker must be screwed directly into the panel backpan. This prevents the breaker from dislodging during high-current faults.

No. This 3-pole breaker features a standard ABC phase configuration. The integral I-Line jaws are fixed in place and designed to engage all three busbars simultaneously.

The equipment must be properly de-energized, or appropriate arc flash PPE must be worn if live adjustment is permitted by facility safety rules. Dial settings should strictly follow a formal coordination study to ensure safe clearing times and prevent nuisance tripping.