Siemens SN425 Disconnect Switch, 400A, 3-Pole, 240V

Siemens SN425 Disconnect Switch, 400A, 3-Pole, 240V is built to deliver safe, reliable isolation for demanding industrial electrical work. Designed for industrial service, maintenance, and replacement projects, this 3-pole disconnect switch provides robust performance when you need to routinely shut down and re-energize three-phase circuits.

Key features at a glance

• Current rating: 400 A — ready for heavy feeders, motors, and power buses in industrial settings
• Poles: 3 poles — designed for true three-phase isolation
• Voltage: 240 V — suitable for common industrial power distribution schemes
• Manufacturer: Siemens — backed by a global service network and established compatibility within Siemens-compatible panels
• Model: SN425 — verify fit by part number and application requirements

Why this disconnect switch matters

• Reliable isolation for routine maintenance, panel upgrades, or equipment replacement ensures worker safety and minimizes downtime.
• Three-pole design guarantees complete disconnection of three-phase circuits, reducing the risk of arc flash and accidental re-energization during service.
• Industrial-grade construction from Siemens translates to consistent performance in challenging environments where outages or equipment failures can impact production schedules.

Ideal use scenarios

• Isolating three-phase feeders in service panels, motor control centers, and equipment rooms during maintenance
• Temporary or permanent replacement projects where reliable, code-conscious isolation is required
• Retrofits or upgrades in facilities that rely on Siemens-compatible components and a proven distribution strategy

How to ensure the SN425 fits your application

Compatibility should be confirmed by the part number (SN425) and your specific application requirements. If you’re unsure about fit or substitutions, our team can help verify compatibility based on your panel type, wiring configuration, and system voltage. Need help matching a part number or confirming compatibility? Message us and we’ll assist you.

With the Siemens SN425 Disconnect Switch, you get a purpose-built solution for dependable circuit isolation in demanding industrial environments—designed to support safe maintenance workflows and durable, long-term serviceability.