ABB 1SAZ911201R1005 Thermal overload relay

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1. Product Overview

The ABB 1SAZ911201R1005 Thermal Overload Relay is a key device for protecting low-voltage AC motors. It automatically disconnects the control circuit in case of overload or phase failure, preventing motor overheating and damage. The relay features a bimetallic thermal trip mechanism, adjustable current settings, manual/automatic reset options, and clear status indication. It can be mounted directly on ABB contactors or independently on a base, providing reliable motor protection.

2. Technical Specifications

3. Key Features & Advantages

• Reliable motor protection against overload and phase failure

• Adjustable current setting to match motor rating (75–87 A)

• Manual/automatic reset with TEST/STOP function and clear status indication

• Auxiliary contact feedback for control or interlock purposes

• Compact design for direct mounting on ABB AF80/AF96 contactors

• Industrial standard compliance for IEC and UL certified protection

4. Typical Applications

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

• Industrial automation motor control systems

• Pumps, fans, compressors, and other rotating machinery

• HVAC drives, elevator motors, and power equipment

• Motor control centers and control panels

• Heavy machinery and automated production systems

5. Installation & Safety Notes

1. Adjust relay current to match motor rated current before installation.

2. Mount with compatible ABB AF80/AF96 contactors for reliable protection.

3. Ensure all wiring is tight and secure.

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

5. Only reset after clearing the root cause of the trip.

6. Periodically inspect relay and contactor for wear and wiring condition.

7. Use in combination with short-circuit protection devices (breaker/fuse) for complete protection.

The structure and details of the product：

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