Siemens 3NP1153-1DA10 - 400A, 3-Pole, Fused Disconnect Switch

The Siemens 3NP1153-1DA10 is a rugged 400A, 3-pole fused disconnect switch engineered for industrial and commercial environments that demand safe, reliable electrical isolation. Built to support proper lockout and tagout procedures, this disconnect delivers a dependable, load-safe disconnection that helps maintenance teams work with confidence—and for the long haul.

Key benefits at a glance

• 400A, 3-pole configuration ensures simultaneous isolation of all three phases, reducing the risk of partial shutdowns or backfeed during service work.
• Fused protection provides rapid interruption of fault currents, enhancing electrical safety and system protection in demanding facilities.
• Industrial-grade durability designed to stand up to the vibrations, dust, and temperature variations common in commercial and manufacturing environments.
• Lockout/Tagout readiness supports standard safety protocols, helping teams secure equipment during maintenance and testing.
• Seamless integration with existing Siemens switchgear and panels, making retrofits or new installations straightforward and reliable.

Why this model stands out

• Siemens reliability backing a purpose-built solution for isolation and overcurrent protection, reducing downtime and service interruptions.
• Clear, definitive disconnection during fault conditions and maintenance activities, giving technicians a predictable and safe operating state.
• Designed for long-term service life in busy facilities where equipment endures regular use, load changes, and routine safety practices.

Ideal use cases

• Main feeders in industrial facilities that require robust isolation before servicing large motors or electrical gear.
• Commercial electrical distributions where dependable disconnection under load is critical for safety and uptime.
• Maintenance points within motor control centers (MCCs) and power distribution setups that depend on reliable LOTO procedures.

Installation and safety considerations

Designed to integrate with standard electrical infrastructure, the 3NP1153-1DA10 supports clear isolation of all conductors in the protected circuit. Use it as part of a comprehensive safety program that includes documented lockout/tagout procedures, regular inspection of disconnect integrity, and routine fuse condition checks to maintain optimal performance.

Specifications

• Amperage rating: 400A
• Number of poles: 3-Pole
• Product type: Fused Disconnect Switch
• Brand: Siemens
• Model: 3NP1153-1DA10