Square D JDA36150 Molded Case Circuit Breaker

The JDA36150 is designed exclusively for Square D I-Line panelboards and switchboards [1.3.3]. It cannot be installed in standard NQ or NF series panels, and its plug-on jaw design is incompatible with standard unit-mount or bolt-on applications.

This breaker utilizes the I-Line plug-on system for the line side, engaging directly onto the panel bus via compression jaws. The load side is equipped with standard mechanical lugs for terminating field wiring.

Yes. While the long-time thermal protection is fixed, the instantaneous magnetic trip setting is adjustable. This provides electricians the flexibility to tune the short-circuit response and prevent nuisance tripping from high inrush loads like motors or transformers.

Yes, the JDA36150 is the direct, modern replacement for the discontinued Square D KA36150. It shares the same physical dimensions and I-Line mounting interface, allowing it to drop directly into existing legacy panelboards without modification.

The primary difference is the mounting type. The JDA36150 is an I-Line breaker designed to plug directly into a panelboard bus on the line side. The JDL36150 is a unit-mount breaker equipped with mechanical lugs on both the line and load sides for traditional wired installations.

Yes, the PowerPacT J-Frame series utilizes a dual-break rotating contact mechanism that reduces peak current during a short-circuit fault. This current-limiting design minimizes potential electrical and mechanical damage to downstream equipment.

Yes, the I-Line plug-on design allows for flexible phase arrangement during installation. Depending on how the breaker is positioned on the panelboard bus stack, installers can easily balance the electrical load across the phases without altering any bolted connections.