Square D H325N - 400A, 240V, 3-Pole, Fused Disconnect Switch

The Square D H325N 400A, 240V, 3-Pole Fused Disconnect Switch is engineered for dependable electrical isolation in demanding industrial and commercial settings. Designed to support safe lockout/tagout procedures and provide a clean, controllable disconnect under load, this switch focuses on reliability, durability, and straightforward maintenance so your critical equipment stays protected and available when it matters most.

• Amperage rating: 400 A
• Voltage rating: 240 V
• Poles: 3-Pole
• Enclosure: NEMA 1
• Type: Fused Disconnect Switch
• Brand: Square D
• Model: H325N

What makes the H325N stand out is its integrated fuse protection paired with a robust, user-friendly design. The fused disconnect provides overcurrent protection for motor circuits and feeders while enabling operators to safely isolate equipment during maintenance or in an emergency. With a dedicated 3-pole configuration, all conductors are simultaneously disconnected, reducing arcing risk and ensuring a complete, reliable mute of power to downstream devices.

Key benefits in real-world use:

• Safe isolation under load: Built to disconnect power cleanly when required, helping prevent damage to equipment and reducing downtime during maintenance or service outages.
• Lockout/Tagout compatibility: Supports standard safety procedures, letting technicians secure the circuit during service to protect personnel.
• Indoor ruggedness (NEMA 1): Engineered for indoor applications where dust and debris exposure are a consideration, delivering steady performance over the long term.
• Heavy-duty suitability: With a 400 A rating at 240 V, it is appropriate for feeding large motors, machinery lines, and other demanding loads found in industrial or commercial facilities.

Ideal for facilities that require a reliable service disconnect or motor feeder protection, the Square D H325N is well-suited for applications such as machinery rooms, manufacturing lines, HVAC installations, conveyors, and other equipment that benefits from a dedicated fused disconnect switch. It’s a practical choice for electrical panels, switchgear assemblies, and distribution feeds where safety, compliance, and continuous operation are priorities.

Compared to non-fused disconnect options, the H325N adds built-in overcurrent protection without the need for separate fusing components, simplifying install time and reducing component count while delivering rapid, reliable disconnection when tripping occurs. This translates to fewer interruptions and a clearer path to safe, controlled shutdowns.

Practical considerations for deployment:

• Verify compatibility with existing electrical panels and feeders expecting a 3-pole, 400 A, 240 V fused disconnect configuration.
• Plan for routine inspection of connections and fuse replacements to minimize downtime during planned maintenance.
• Stock a small inventory of compatible fuses to support quick recovery after a fault or preventive maintenance window.
• Integrate this switch into your lockout/tagout program to ensure consistent safety practices across maintenance teams.

With the Square D name behind it, you’re choosing a solution built for reliability, long service life, and straightforward operation in challenging environments. The H325N delivers clear, decisive isolation when you need it, while supporting safe, compliant maintenance routines and steady, uninterrupted performance for essential equipment.