Square D JDA36250U44X Molded Case Circuit Breaker

This breaker features an I-Line style plug-in connection and is designed exclusively for use in Square D I-Line panelboards and switchboards.

The U44X suffix designates a Micrologic 6.2 A electronic trip unit. This provides LSIG (Long-time, Short-time, Instantaneous, and Ground-fault) protection along with integrated ammeter capabilities.

The D indicates the interrupting capacity rating for this PowerPacT J-frame breaker, which provides 25 kA at 240VAC, 18 kA at 480VAC, and 14 kA at 600VAC.

It utilizes the Square D I-Line plug-in mounting system. The line side snaps directly onto the panelboard bus stack, while the load side uses traditional mechanical lugs for wire connections.

The factory-installed lugs accept aluminum or copper conductors ranging from 3/0 AWG to 350 kcmil.

Yes, the Micrologic electronic trip unit features adjustable dials for Long-time, Short-time, Instantaneous, and Ground-fault (LSIG) pickup and delay settings, allowing for precise selective coordination.

When applying this LSIG breaker in a 3-phase, 4-wire system, a neutral current transformer (CT) is typically required to accurately monitor ground-fault currents and prevent nuisance tripping.

No. While some thermal-magnetic PowerPacT breakers carry a DC rating, breakers equipped with Micrologic electronic trip units are rated for AC voltage systems only.

The ground-fault function (the G in LSIG) detects low-level leakage currents to ground. This helps protect electrical equipment from destructive arcing faults that standard overload or short-circuit settings might not catch.