ABB 1SAZ721201R1038 Thermal overload relay

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1. Product Overview

The ABB 1SAZ721201R1038 Thermal Overload Relay is a high-reliability device for low-voltage motor protection. It monitors motor current and disconnects the circuit in case of overload or prolonged overcurrent, protecting the motor from damage.

The relay uses a bimetallic strip thermal trip mechanism for precise and reliable thermal protection, and provides manual/automatic reset options. It is easily mounted in combination with ABB contactors.

2. Technical Specifications

3. Key Features & Advantages

• Reliable overload protection: Prevents motor overheating and damage

• Precise thermal trip: Bimetallic strip design ensures stable and reliable action

• Reset function: Manual or automatic reset for easy maintenance and operation

• Contactor compatibility: Direct mounting with ABB contactors

• Compact design: Saves space in control panels and cabinets

• Standards compliant: IEC and UL certified for safety and reliability

4. Typical Applications

• Low-voltage AC motor protection

• Industrial machinery such as pumps, fans, and compressors

• Automated industrial production lines

• HVAC systems and energy management equipment

• Small industrial distribution and control cabinets

5. Installation & Safety Notes

1. Ensure relay rated current matches the motor’s rated current to prevent nuisance trips or insufficient protection.

2. Properly mount with compatible contactors to ensure reliable operation.

3. Maintain a dry and ventilated environment; avoid corrosive liquids or dust.

4. Reset only after the fault has been cleared to prevent further motor damage.

5. Regularly inspect the relay and contactor condition to ensure long-term reliability.

The structure and details of the product：

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