Square D QMB3603T Panelboard Switch 30 Amp 600V

Square D QMB3603T is a three‑pole fusible panelboard switch designed for use inside QMB fusible panelboards, providing a dedicated disconnect with fuse protection for three-phase feeders. This part is rated 30 A at 600 V and accepts standard Class H, R, or J fuses (fuse kits sold separately) to create a field‑replaceable protection module. As a 3‑pole device, it ensures synchronized switching across all phases, making it suitable for commercial or light industrial distribution where a fusible disconnect is required. The 600 V rating supports higher‑voltage distribution environments, while the 30 A rating targets smaller feeders or motor feeders when paired with appropriate fuse blocks. The QMB3603T complements other QMB components, enabling modular power distribution with coordinated protection and isolation within Schneider Electric’s Square D lineage. When selecting this part, verify panelboard compatibility and fuse type requirements, and follow the manufacturer’s installation instructions for safe operation and compliance with applicable electrical codes.