Square D JLA36250 Molded Case Circuit Breaker

This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It features a specialized plug-on line side connection that mounts directly to the I-Line bus stack.

No, the JLA36250 is an I-Line breaker and will not fit in NQ, NF, or QO series panelboards. It requires an I-Line interior to accommodate the plug-on jaws.

The third letter in the catalog number indicates the interrupting rating. The JLA model features a very high interrupting capacity of 100kA at 480VAC, while JDA and JGA models have lower short-circuit ratings. All three share the same physical dimensions and I-Line mounting.

The PowerPacT J-frame is the modern equivalent for legacy 250A I-Line breakers like the KA, KC, or KH series. However, you must verify your available panel space, as the physical dimensions of the J-frame differ from the older legacy frames.

The line side of the breaker features plug-on jaws that clamp directly onto the panelboard bus. The breaker is then secured to the backpan using the built-in mounting bracket, while the load side uses standard mechanical lugs for wire termination.

Yes, the breaker comes with factory-installed load side lugs. These lugs are rated for both aluminum and copper conductors ranging from 3/0 AWG to 350 kcmil.

The adjustable magnetic trip allows you to set the instantaneous short-circuit pickup level. This adjustability helps electricians coordinate the breaker with other protective devices in the electrical system to prevent nuisance tripping.

Yes, the JLA36250 is rated for use in DC systems up to 250VDC or 500VDC. This makes it suitable for specific solar, battery storage, or industrial DC control circuits requiring a 250A disconnect.

While I-Line panels feature shielded bus stacks, standard safety practices and OSHA regulations require de-energizing the switchboard or panelboard before installing or removing breakers to prevent severe arc flash hazards.