Square D HJA36030 Molded Case Circuit Breaker

Yes. The PowerPacT H-Frame HJA36030 [1.3.4] is a direct replacement for legacy 30A F-Frame I-Line breakers, including the FA36030, FH36030, and FC36030. It snaps directly into the same Square D I-Line panelboards and switchboards.

The HJA36030 features a J-class interrupting rating, offering higher short-circuit protection (65kA at 480VAC) compared to the D-class HDA36030 (18kA at 480VAC) and G-class HGA36030 (35kA at 480VAC) models. All three share the exact same physical dimensions and I-Line mounting style.

In the PowerPacT nomenclature, "H" designates the H-Frame physical size, "J" indicates the specific high interrupting capacity tier, and "A" signifies the I-Line plug-on mounting style for the line-side connection.

The HJA36030 utilizes an I-Line plug-on mounting configuration. It features factory-installed jaw-type connections on the line side that press directly onto the live buswork of an I-Line panelboard, while the load side uses standard mechanical lugs.

The standard mechanical lugs on this breaker accept both copper and aluminum conductors. The supported wire gauge ranges from 14 AWG up to 3/0 AWG.

The built-in magnetic trip protection operates with a hold current of 350A and an instantaneous trip current of 750A. This provides a specific window for inrush current before the breaker opens.

Yes. If your application requires a unit-mount breaker with mechanical lugs on both the line and load sides instead of an I-Line connection, the correct equivalent part number is HJL36030.

Yes. The PowerPacT H-Frame series utilizes a current-limiting design featuring dual-break rotating contacts. This reduces the peak current and let-through energy during a short-circuit fault, limiting potential damage to downstream electrical equipment.

No. The HJA36030 is designed exclusively for heavy-duty Class 612 I-Line panelboards and switchboards. It will not physically fit in QO, NQ, or NF series panels.