ABB 1SAZ211201R1051 Thermal Overload Relay

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• 1. Product Overview

  ABB 1SAZ211201R1051 Thermal Overload Relay is an electrical device designed to protect motors by disconnecting the circuit when the motor is overloaded. It uses a bimetallic thermal effect to reliably protect the motor and can be combined with ABB contactors to form a complete motor control protection system.

  The product features compact design, easy installation, and offers both manual and automatic reset options, making it widely used in industrial automation and motor control systems.

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  2. Main Technical Data

  General

  • Product type: Thermal Overload Relay

  • Model: 1SAZ211201R1051

  • Rated operating current (Ie): 1–1.6 A

  • Rated voltage: AC 690 V

  • Poles: 3P

  • Adjustable current range: 1–1.6 A

  • Trip type: Thermal

  • Reset: Manual/Automatic selectable

  • Mechanical life: ≥10,000 operations

  • Electrical life: ≥4,000 operations (with contactor)

  Standards & Certification

  • IEC/EN 60947-4-1

  • CE certified

  • Optional UL / CSA certification

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  3. Key Advantages and Features

  1. Reliable motor protection: Bimetallic thermal element provides effective overload protection.

  2. Adjustable current range: 1–1.6 A adjustable to suit different motor ratings.

  3. Flexible reset: Selectable manual or automatic reset.

  4. Compact design: Compatible with ABB contactors, saving installation space.

  5. Easy operation: Simple installation and wiring, easy maintenance.

  6. High durability: Long mechanical life suitable for industrial applications.

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  4. Typical Applications

  • Industrial motor protection

  • Pumps and fans motor control systems

  • Conveyor belts and packaging machines

  • Automated production line motor protection

  • HVAC systems and other low-voltage motor applications

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  5. Installation and Operation Notes

  1. Rating match: Ensure the relay’s rated current matches the motor’s rated current.

  2. Correct installation: Use with compatible contactor and follow wiring diagram.

  3. Environmental conditions: Avoid high humidity, high temperature, and corrosive environments.

  4. Regular inspection: Check contacts and reset function for proper operation.

  5. Load protection: Ensure the relay disconnects the motor promptly in overload situations.

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The structure and details of the product：

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