The Square D by Schneider Electric H321NRB is a 30 A fusible safety switch (disconnect) for three‑phase systems, rated 240 V and housed in a NEMA 3R enclosure for outdoor use. This 3‑pole, 4‑wire device (three hots and a neutral) accepts Class R fuses and is part of Schneider Electric’s heavy‑duty H‑series safety switches (Series F, Type H). It provides a high short‑circuit current rating—up to 200 kA at 240 V—allowing rapid, safe interruption during faults. Typical outdoor or semi‑outdoor applications include feeding three‑phase equipment and HVAC systems where fused disconnect protection is required.
