Siemens DTNF225 400A 2P 240V Safety Switch, NEMA 1, Fusible, Non-Fusible | AmpState

The Siemens DTNF225 400A safety switch is engineered for dependable equipment disconnect and isolation at the point of use. Built to support retrofit projects and maintenance planning, this 2-pole, 240V solution preserves a consistent part number, making spares and service simpler for your team.

What sets the DTNF225 apart

• Versatile protection in one unit — available in both fusible and non-fusible configurations to meet your protection strategy and isolation needs.
• High-capacity performance — 400 A continuous rating handles demanding loads common to industrial lines, pumps, and motors.
• Compact, reliable 2-pole design — streamlined wiring and straightforward maintenance with 2-pole operation at 240V.
• Indoor-grade enclosure — NEMA 1 enclosure provides solid protection in indoor environments while keeping installations tidy and code-compliant.
• Part-number stability for upgrades — designed to fit maintenance and retrofit workflows where the part number must remain consistent over time.

Ideal applications and use cases

• Equipment disconnect at the point of use in manufacturing lines, conveyors, and machine rooms.
• Retrofit projects where keeping the existing part number simplifies stocking and service planning.
• Maintenance shutdowns and routine isolation tasks that require clear, reliable isolation points.
• HVAC, pumps, and auxiliary systems that demand a robust, compliant safety switch with optional fusible protection.

Configuration, installation, and practical considerations

The DTNF225 is suited for installations requiring either fused protection or a non-fusible disconnect, depending on your system protection scheme and maintenance preferences. Ensure proper matching with your wiring, control circuits, and protective devices, and verify indoor installation within a NEMA 1 enclosure. For retrofit projects, the ability to preserve the same part number can reduce lead times and simplify future service calls.

Specifications at a glance

• Manufacturer: Siemens
• Part number: DTNF225
• Product type: Safety Switch
• Amperage: 400 A
• Poles: 2
• Voltage: 240 V
• Enclosure: NEMA 1
• Configuration: Fusible and Non-Fusible options available
• Availability: Available from AmpState

How AmpState supports your purchase

Need help confirming fit or matching a part number for your specific installation? Message the AmpState team and we’ll verify compatibility and guide you toward the right configuration for your system. The DTNF225 is ready to ship from AmpState, helping you minimize downtime and keep maintenance schedules on track.