Square D PQ3603 Fusible Bus Plug Horizontal

Square D PQ3603G is a fusible plug-in unit for I-Line busway systems. This 30 A, 600 V, three-pole, three-wire device houses three fuses and a grounding path (G) and uses a plug-in connection to mount into compatible Square D I-Line busways for rapid insertion and removal. The horizontal mounting variant is identified by the orientation suffix (H) on the catalog number, per Schneider Electric guidance for plug-in units; this ensures it is suitable for horizontal bus runs. As part of the Square D I-Line family, the PQ3603G provides fusible protection taps along a busway distribution run, enabling field-replaceable protection for feeders without the need for a separate switchgear module. The unit is rated for 600 VAC operation, aligning with typical I-Line busway configurations found in industrial facilities and commercial installations requiring modular, plug-in protection for three-phase, three-wire circuits.