ABB OS800L03 - 800A, 600V, 3-Pole, Fused Disconnect Switch

Engineered for demanding industrial and commercial electrical systems, the ABB OS800L03 delivers reliable isolation with fused protection. With an 800A rating and 600V capacity, it handles large motor feeders and heavy loads while keeping downtime and risk to a minimum.

Three robust poles ensure true three-phase disconnection, so maintenance personnel can lock out equipment with confidence. The integrated fuse disconnect design provides fast fault clearing and dependable performance under load, helping you protect motors, feeders, and control circuits without sacrificing service continuity.

Why this fused disconnect switch stands out

• High current capability — 800A continuous, suitable for heavy-duty motor feeders and large electrical loads.
• Wide voltage range — supports up to 600V systems, common in industrial environments.
• Three-pole construction — delivers full three-phase isolation and simplifies panel wiring.
• Fused protection — built-in fuses provide overcurrent protection and rapid fault clearing.
• Lockout/Tagout readiness — designed to integrate with standard safety procedures, improving maintenance safety.
• Durable, serviceable design — optimized for long-term reliability and straightforward fuse replacement.

Ideal applications

• Motor control centers, large drives, and high-capacity feeders in manufacturing facilities.
• Commercial HVAC and processing systems requiring reliable isolation during service.
• Power distribution panels and switchgear assemblies where safe de-energization is essential.

Key specifications

• Amperage Rating: 800A
• Voltage Rating: 600V
• Number of Poles: 3-Pole
• Product Type: Fused Disconnect Switch
• Brand: ABB
• Model: OS800L03

Practical tips: Ensure proper lockout/tagout procedures are followed before any servicing. Regularly inspect fuse elements for wear and replace only with identical rated fuses to maintain protection performance. Confirm panel mounting compatibility with your enclosure and verify alignment of conductors to minimize resistance and heating.