ABB 1SAZ721201R1023 Thermal overload relay

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1. Product Description

The ABB 1SAZ721201R1023 Thermal Overload Relay is a protective device designed to safeguard AC motors against overload, stall, or phase imbalance. Using a thermal-magnetic principle, it provides precise motor protection by adjusting the current setting. The compact design allows easy installation, typically paired with AC contactors, and is widely used in industrial automation, HVAC systems, pump stations, and motor control applications.

2. Technical Specifications

• Model: 1SAZ721201R1023

• Type: Thermal Overload Relay

• Compatible Contactor Models: AX32, AX40 series

• Rated Current Range: 0.63–1 A

• Poles: 3 poles

• Protection Functions:

  • Overload protection

  • Phase failure (loss of phase) protection

  • Overheat protection

• Reset Method: Manual / Automatic reset

• Mechanical Life: ≥ 10,000 operations

• Electrical Life: ≥ 100,000 operations

• Mounting: Mounted with contactor or DIN rail

• Ambient Temperature: -25 ℃ to +60 ℃

• Protection Class: IP20

• Standards Compliance: IEC 60947-4-1, CE

3. Advantages and Key Features

• High-precision protection
  Adjustable current setting ensures timely disconnection during overload or stall, protecting motors.

• Compact design
  Combined with contactor, saves installation space and simplifies control cabinet layout.

• Overheat and phase-failure protection
  Built-in phase loss detection ensures motor safety under unbalanced current conditions.

• Manual/automatic reset
  Supports both reset modes to meet different control requirements.

• Long-term reliability
  High mechanical and electrical lifespan suitable for industrial environments with frequent operations.

4. Typical Applications

• Industrial motors and automated production lines

• HVAC motor protection

• Pump and compressor control

• Conveyor and mechanical equipment motor protection

• Fans and ventilation system motor protection

5. Precautions

• Disconnect power before installation or maintenance.

• Ensure relay rated current matches the motor rated current to avoid misoperation or insufficient protection.

• Avoid installation in high humidity, dusty, or corrosive environments.

• Regularly check the relay and terminal connections for long-term reliability.

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The structure and details of the product：

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