Square D DU321 30A 3P 240V Safety Switch, NEMA 1, Fusible, Non-Fusible | AmpState

Meet the Square D DU321 30A 3P 240V Safety Switch — a dedicated point‑of‑use disconnect engineered for dependable equipment isolation in three‑phase industrial setups. With a NEMA 1 enclosure, it’s built to protect control circuits in indoor environments while simplifying maintenance and retrofit workflows.

Choose the configuration that fits your protection needs:

• Fusible variant: integrated overcurrent protection for rapid response to faults, helping safeguard downstream equipment.
• Non‑Fusible variant: a straightforward disconnect switch for manual de‑energization during service or maintenance.

Key specs at a glance show a precise fit for common industrial needs: 30 amperes, 3 poles, and 240V, all in a compact, reliable package from Square D. This DU321 model is specifically designed to support safe isolation of three‑phase equipment right at the point of use, making it ideal for panel upgrades, retrofit projects, and ongoing maintenance planning.

Why this safety switch stands out

• Three‑phase clarity with a 3‑pole configuration that cleanly controls all conductors in a 240V circuit, reducing wiring complexity in cabinets and control panels.
• Versatile protection—available in both fusible and non‑fusible versions to match your system’s fault protection strategy and maintenance preferences.
• Indoor reliability with a NEMA 1 enclosure, designed to endure typical shop and plant environments while keeping critical components protected.
• Consistent form factor—the DU321 maintains a stable footprint for retrofit projects, so part numbers stay familiar even as you upgrade equipment.
• Trusted brand, easy sourcing—Square D quality supported by AmpState availability, making replacements or replacements fast and predictable.

Ideal for: equipment disconnects, service switches at the point of use, maintenance shutdowns, and retrofits where keeping the same part number simplifies stocking and repairs. If you’re verifying compatibility or matching a part number for a specific panel or machine, AmpState can help confirm fit and ensure the DU321 variant you choose aligns with your wiring, footprint, and safety requirements.

Practical, dependable, and built for real‑world use, the DU321 helps you protect people, preserve equipment, and minimize downtime. Ready to secure your three‑phase systems with a switch you can trust? Reach out to AmpState for availability and compatibility guidance on the Square D DU321 30A 3P 240V Safety Switch.