ABB OT800U03 - Non-fused disconnect switch

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1. Product Overview

The ABB OT800U03 is a non-fused disconnect switch designed for industrial and commercial electrical systems to safely isolate and disconnect power for maintenance. The switch complies with IEC standards and is suitable for low-voltage circuits. The non-fused design provides reliable on/off operation but does not provide overcurrent or short-circuit protection, requiring separate fuses or circuit breakers.

2. Technical Specifications

• Model: OT800U03

• Product Type: Non-fused Disconnect Switch

• Rated Operational Voltage: 690 V AC

• Rated Operational Current: 800 A

• Poles: 3P or 4P

• Operation Method: Manual rotary handle

• Mechanical Life: ~10,000 operations

• Mounting: Panel mount or DIN rail (model dependent)

• Degree of Protection: IP65 (suitable for indoor/outdoor)

• Operating Temperature: -25 ℃ to +60 ℃

• Rated Short-time Withstand Current: 50 kA / 1 s

• Dimensions (Approx.): Configurable according to panel and installation

3. Advantages & Features

1. High Reliability and Durability
   Industrial-grade design ensures long-term continuous use.

2. Safe Isolation Operation
   Provides visible disconnect functionality for safe maintenance.

3. High Current Capacity
   Rated for up to 800 A, suitable for high-power loads.

4. High Protection Level
   IP65 rating for indoor and outdoor use, dust and water resistant.

5. Easy Operation
   Manual rotary handle clearly indicates switch status for convenient operation.

6. Modular Design
   Flexible 3P or 4P configurations to meet different circuit requirements.

4. Application Areas

The ABB OT800U03 non-fused disconnect switch is commonly used in:

• Industrial plant main power isolation

• Motor and variable frequency drive supply control

• Distribution and control panel isolation

• Low-voltage commercial building power systems

• UPS, generator, and backup power systems

• Electrical maintenance and service operations

5. Notes & Precautions

1. Always disconnect the main power before installation.

2. The switch does not provide overload or short-circuit protection and must be used with suitable fuses or circuit breakers.

3. Installation and wiring should be performed by qualified personnel.

4. Do not exceed the rated voltage and current.

5. Regularly inspect mechanical operation and contacts to ensure reliability.