ABB 1SAZ721201R1040 Thermal Overload Relay

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1. Product Overview

The ABB 1SAZ721201R1040 Thermal Overload Relay is a key protective device for low-voltage AC motors. It monitors motor current and disconnects the control circuit in case of overload or phase failure, preventing motor overheating or damage. The relay features a bimetallic strip thermal trip mechanism, adjustable current settings, manual/automatic reset options, and status indication. It can be mounted directly on ABB contactors or installed independently using a base, providing reliable motor protection.

2. Technical Specifications

3. Key Features & Advantages

• Reliable motor protection: Thermal trip mechanism disconnects overload or phase-failure current.

• Adjustable current setting: 5.7–7.6 A range allows precise protection matching motor rating.

• Reset and indication functions: Manual or automatic reset, TEST/STOP functions, clear status display.

• Auxiliary contact feedback: 1 NC + 1 NO for control or signaling purposes.

• Compact mounting: Direct mounting on ABB contactors or standalone installation.

• Standards compliance: IEC and UL certified for industrial environments.

4. Typical Applications

• Overload and phase-failure protection of three-phase AC motors

• Industrial automation motor control systems

• Pumps, fans, compressors, and other mechanical equipment

• HVAC systems, elevator drives, and power-driven loads

• Small industrial control cabinets and motor control centers

• Other three-phase motor applications requiring thermal overload protection

5. Installation & Safety Notes

1. Set the relay to match the motor’s rated current.

2. Mount with compatible ABB contactors for reliable operation.

3. Ensure all wiring is tight to prevent poor contact.

4. Install in dry, ventilated conditions, avoiding dust, moisture, or corrosive gases.

5. Only reset after clearing fault conditions.

6. Regularly inspect the relay and contactor for wear and proper connection.

7. Use short-circuit protection devices along with the thermal overload relay.

The structure and details of the product：

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