Square D H321DS - 30A, 240V, 3-Pole, Fused Disconnect Switch

The Square D H321DS is a rugged 30A, 240V, 3‑Pole Fused Disconnect Switch designed for industrial and commercial environments where safe, reliable electrical isolation is non‑negotiable. Its three‑pole configuration ensures full phase disconnection, making lockout/tagout procedures straightforward and dependable during maintenance and service work.

Why the H321DS stands out

• Three‑pole design for complete isolation of all phases in 3‑phase systems, reducing the risk of partial energization.
• Fused protection delivers reliable overcurrent protection and clean disconnection under load, helping protect downstream equipment and personnel.
• Clear alignment with lockout/tagout practices, supporting safe maintenance workflows and compliance with safety protocols.
• Robust, industrial‑grade construction built to endure demanding operating environments over the long term.

Ideal applications

• Industrial equipment and motor circuits where a dedicated disconnect is required for service and maintenance.
• Commercial facilities with 3‑phase power distribution that demand reliable isolation to meet safety standards.
• Electrical panels and service enclosures that require a predictable, fuse‑protected disconnect option.

Specifications at a glance

• Amperage rating: 30A
• Voltage rating: 240V
• Number of poles: 3‑Pole
• Product type: Fused Disconnect Switch
• Brand: Square D
• Model: H321DS

Practical guidance for use

• Plan lockout/tagout procedures around the H321DS to maximize crew safety during maintenance windows.
• Ensure compatible fuses are installed to maintain intended protection levels and system coordination.
• Incorporate alongside other safety controls in your electrical distribution strategy to enhance overall protection of personnel and equipment.

Who benefits from this disconnect

Electrical engineers, plant technicians, and maintenance teams working with 3‑phase equipment will appreciate the H321DS for its clear isolation capability, reliable fused protection, and compatibility with industry safety practices. If your setup operates on 240V/3‑phase systems and requires a dedicated, fuse‑protected disconnect, the Square D H321DS offers a precise fit with durable, long‑term performance.