ABB OT400U03 - 400A, 3-Pole, Fused Disconnect Switch

Meet the ABB OT400U03, a 400 A, three-pole fused disconnect switch engineered for reliable electrical isolation in challenging industrial and commercial environments. It delivers dependable disconnection under load while supporting proper lockout/tagout procedures—an essential combination for safety, uptime, and compliance during maintenance and service work.

What makes the OT400U03 stand out

• 3-pole configuration with a 400 A amperage rating, providing robust isolation for three-phase systems
• Integrated fused protection that interrupts fault currents, protecting downstream equipment and reducing the risk of cascading failures
• Designed to support lockout/tagout procedures, enabling safer maintenance and service operations
• Built for durable industrial use, delivering reliable performance in demanding environments
• Seamless integration with standard electrical assemblies and control panels for streamlined installation

Ideal applications

• Motor feeders and three-phase power distribution in manufacturing lines
• Emergency shutdown points and maintenance isolations in commercial facilities
• Upgrading or retrofitting existing switchgear and panel assemblies requiring reliable isolation with fuse protection
• Any scenario where safe, controlled disconnection under load is essential for safety and equipment protection

Technical specifications

• Amperage rating: 400 A
• Number of poles: 3-pole
• Product type: Fused Disconnect Switch
• Brand: ABB
• Model: OT400U03

The ABB OT400U03 provides a clear, reliable isolation point that supports strong safety practices. The fuse element adds critical protection for downstream equipment, while the switch offers a straightforward path to safe maintenance and service operations. In real-world use, this means shorter downtime during servicing, reduced risk during energy isolation, and improved overall reliability of a facility’s electrical system.

Best results come from pairing this device with established lockout/tagout procedures and routine inspection of both the switch and fuse elements. With its combination of high current capability, three-pole configuration, and fused protection, the OT400U03 is a dependable choice for maintaining safe, controlled electrical isolation in demanding environments.