ABB 1SAZ811201R1001 Thermal Overload Relay

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1. Product Overview

The ABB 1SAZ811201R1001 Thermal Overload Relay is a key protection device for low-voltage AC motors. It disconnects the control circuit in case of overload or phase failure to prevent motor overheating or damage. The relay uses a bimetallic strip thermal trip mechanism, with adjustable current settings, manual/automatic reset, and status indication. It can be mounted directly on ABB contactors or installed separately, providing reliable motor protection.

2. Technical Specifications

3. Key Features & Advantages

• Reliable motor protection: Thermal trip mechanism responds to overload and phase failure.

• Adjustable current setting: 0.1–0.16 A range for small motor protection.

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

• Auxiliary contact feedback: 1 NC + 1 NO for control signals or interlock.

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

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

4. Typical Applications

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

• Industrial automation motor control systems

• Small pumps, fans, compressors, and other power equipment

• HVAC systems and elevator drives

• Small motor control cabinets and control centers

5. Installation & Safety Notes

1. Set the relay according to motor rated current.

2. Mount with compatible ABB contactors for reliable operation.

3. Ensure tight and secure wiring.

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

5. Only reset after clearing faults.

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

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

The structure and details of the product：

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