A-B 1769-L32E Output module

A-B Overload Relays Overview

A-B (Allen-Bradley), part of Rockwell Automation, offers a wide range of overload relays designed to protect electric motors from damage caused by overcurrent and overheating. These relays are used in

 conjunction with contactors to form a complete motor control and protection system.

Product Detailed Description

• Function:

• Detects overcurrent conditions in electric motors.

• Interrupts the control circuit after an overcurrent persists for a certain period, stopping the motor.

• Offers manual or automatic reset options.

• Some models provide a test function to verify the relay's operation.

• Some models have fault indication features.

• Types:

• Thermal Overload Relays: Operate based on the principle of bimetallic strips bending due to heat, providing protection against overload and phase loss.

• Electronic Overload Relays: Detect current using current sensors and electronic circuits, offering more precise and flexible protection characteristics, including adjustable trip classes, phase loss protection,

• locked rotor protection, etc.

Product Parameters

• Current Range:

• Varies by model, covering a wide range of motor rated currents.

• Trip Class:

• Examples include Class 10, Class 20, Class 30, etc., indicating the relay's tripping time characteristics at different overload multiples.

• Reset Method:

• Manual Reset.

• Automatic Reset.

• Selectable Manual/Automatic Reset.

• Auxiliary Contacts:

• Provides normally open (NO) and normally closed (NC) fault indication contacts.

• Mounting Method:

• Can be directly mounted on specific A-B contactors or mounted independently.

• Ambient Temperature Compensation:

• Some models have ambient temperature compensation to ensure consistent protection characteristics at different ambient temperatures.

• Communication Capabilities (for Electronic Overload Relays):

• Some high-end electronic overload relays support communication protocols such as Modbus, EtherNet/IP, etc., for remote monitoring and diagnostics.

• Please refer to the official Rockwell Automation (Allen-Bradley) product manual for specific product parameters.

Product Advantages

• Reliable Motor Protection:

• Effectively prevents motor damage due to overload and phase loss, extending motor life.

• Improved System Safety:

• Reduces the risk of equipment damage and personal injury caused by motor faults.

• Reduced Downtime:

• Detects and stops potential motor failures early, reducing unexpected downtime.

• Flexible Protection Characteristics (for Electronic Overload Relays):

• Protection parameters can be adjusted according to specific applications, providing optimized protection.

• Easy Installation and Use:

• Compact design, convenient for installation and wiring.

• Perfect Match with A-B Contactors:

• Ensures optimal compatibility and performance.

Precautions

• Correct Selection:

• Select the appropriate overload relay and trip class based on the motor's rated current, service factor, and application characteristics.

• Correct Installation and Wiring:

• Follow Rockwell Automation's installation guidelines to ensure correct and reliable wiring.

• Proper Setting of Trip Current:

• Set the appropriate trip current based on the motor's rated current and actual operating conditions.

• Regular Inspection and Testing:

• Regularly check the operating status of the overload relay and perform necessary tests to ensure its protection function is normal.

• Pay Attention to Reset Method:

• Select the appropriate reset method according to application requirements and understand the operating procedures and potential risks of manual and automatic reset.

Product Applications

• Industrial Automation:

• Protecting motors in various industrial equipment such as production lines, conveyors, pumps, fans, etc.

• Heating, Ventilation, and Air Conditioning (HVAC):

• Protecting motors in air conditioners, refrigeration equipment, and ventilation systems.

• Water Treatment:

• Protecting motors in water pumps, mixers, etc.

• Material Handling:

• Protecting motors in cranes, conveyor belts, and other equipment.

• Any Application Using Electric Motors:

• Providing reliable overcurrent and thermal protection.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapor

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