ABB OT400US03 - 400A, Disconnect Switch

ABB OT400US03 - 400A, Disconnect Switch delivers dependable on/off isolation and reliable overcurrent protection in tough industrial and commercial settings. Built by ABB, this 400A disconnect is engineered to endure demanding service conditions while simplifying maintenance and installation for long-term reliability.

Key advantages

• 400A continuous current rating supports motor disconnects, panelboards, and branch circuits without compromising performance.
• Compact, maintainable fusible switch design reduces footprint and simplifies serviceability, helping keep equipment rooms tidy and accessible.
• Clear isolation for safety provides a straightforward, decisive disconnect point during maintenance or fault conditions.
• Versatile integration suited for panelboard installations and various branch circuit protection scenarios in industrial environments.
• Durable construction built to withstand demanding applications, delivering consistent operation over time.

Why this ABB OT400US03 stands out

What sets the OT400US03 apart is its combination of compact form factor and robust performance. It delivers reliable electrical isolation and overcurrent protection without the bulk of larger switchgear, making it an economical, space-efficient solution for facilities that require straightforward maintenance and quick serviceability. With ABB’s engineering, you get predictable switching behavior, intuitive operation, and a switch you can count on during routine maintenance and emergency outages alike.

Applications and use cases

• Motor disconnects in manufacturing lines, pumps, conveyors, and large equipment
• Panelboard isolation points to secure sections of electrical distributions
• Branch circuit protection in commercial facilities with demanding electrical loads
• Maintenance-ready safety switch for routine servicing and fuse replacement

Technical specifications

• Model: OT400US03
• Amperage: 400A

Installation, safety and best practices

For optimal performance and safety, install the OT400US03 in accordance with local electrical codes and ABB installation guidelines. Plan for proper lockout/tagout procedures, and designate fuse replacement routines to minimize downtime. The compact footprint and clear labeling help technicians identify connections quickly, supporting safer operation and faster service.

What you gain

Reliability you can trust from a proven ABB disconnect switch that handles demanding environments, with a design focused on straightforward isolation, dependable protection, and accessible maintenance. If you need a compact, maintainable solution for motor control, panelboard isolation, and branch circuit protection, the OT400US03 is a precise fit.