Square D D325NR 400A 3P 240V Safety Switch, NEMA 3R, Fusible | AmpState

The Square D D325NR 400 A 3P 240 V Safety Switch is a rugged, point‑of‑use disconnect designed to reliably isolate heavy electrical equipment when service or maintenance is required. With a NEMA 3R enclosure, this fusible safety switch is built to withstand outdoor exposure and harsh environments without compromising performance.

Designed for retrofit work and long‑term maintenance planning, the D325NR keeps your part numbers consistent. That means fewer procurement headaches when you’re upgrading or replacing legacy gear, and a smoother path to code‑compliant safety procedures on the line.

What makes this safety switch stand out

• High-capacity protection: 400 A, three‑pole configuration supports large 3‑phase equipment and feeders.
• Outdoor‑ready reliability: NEMA 3R enclosure is built to endure rain, dust, and temperature variations while keeping electrical connections secure.
• Fusible design: Integrated fusible protection provides dependable overcurrent interruption at the point of use, simplifying safety architecture and maintenance routines.
• Known part number for retrofit: D325NR is a stable, widely recognized code for easy sourcing and consistent fit across service intervals.
• AmpState support: If you’re verifying compatibility or matching a part number, AmpState can help confirm fit and streamline procurement.

Ideal use cases

• Equipment disconnects and isolation at the point of use for servicing motors, pumps, conveyors, and other heavy machinery.
• Retrofit installations where keeping the same part number simplifies ordering, stocking, and maintenance planning.
• Outdoor or semi‑outdoor facilities such as manufacturing yards, remote plant areas, or weather‑exposed electrical rooms where a robust NEMA 3R enclosure is advantageous.
• Systems requiring dependable 3‑phase, 240 V protection with a clear, single‑point disconnect for safe, controlled shutdowns.

Practical considerations and tips

Plan for routine fuse maintenance and ensure you source compatible fuse cartridges that match the 400 A rating. Label the disconnect clearly for quick identification during maintenance or emergencies. For project teams, keeping the D325NR on the approved part list minimizes downtime when replacements are needed mid‑stream. If you’re unsure about compatibility with your existing switchgear, reach out to AmpState—the team can confirm fit and help you move forward with confidence.

Key specifications at a glance

• Manufacturer: Square D
• Part number: D325NR
• Type: Safety switch (fusible)
• Amperage: 400 A
• Poles: 3
• Voltage: 240 V
• Enclosure rating: NEMA 3R
• Availability: AmpState

Whether you’re planning a retrofit, stocking a reliable replacement, or coordinating maintenance for a critical line, the Square D D325NR 400A 3P 240V Safety Switch delivers sturdy protection with a design that keeps your part numbers consistent. If you need a quick confirmation of fit, message AmpState and let the experts verify compatibility for your exact setup.