SR489-P5-LO-A20-E Simplified Motor Management Relay

Description

SR489-P5-LO-A20-E is a simplified motor management relay designed specifically for low to medium voltage motors. It uses a 5-amper current transformer (CT) secondary side to measure phase current and is integrated with a control power supply (70-265 VAC/90-300 VDC) to monitor motor health. The thermal model of this relay uses current data to simulate the temperature of the motor winding, thereby achieving active overload protection, while its phase imbalance detection function can mark potential wiring or mechanical problems.

SR489-P5-LO-A20-E

In automation systems, this relay serves as a front-end protector and is typically installed in the motor control center (MCC) or near the motor itself. It achieves remote monitoring through analog output (4-20 mA) and interfaces with programmable logic controller (PLC) or human-machine interface (HMI), and is equipped with a user-friendly front panel with LED indicator lights for quick status check. Although the relay lacks advanced communication protocols such as Ethernet, its RS-485 interface supports basic Modbus RTU data recording functions, making it suitable for simple control circuits or standalone applications.

SR489-P5-LO-A20-E

Technical specifications:
Model number SR489-P5-LO-A20-E
Brand GE
Type Basic motor protection relay
CT secondary side 5A (compatible with standard current transformers)
Control power supply 70-265 VAC, 90-300 VDC (universal input)
Frequency range 48-62 Hz
Protection function overload, phase imbalance, locked rotor, undervoltage
Display screen LED indicator light, displaying power, faults, and operating status
Analog output 1 channel 4-20 mA (current or power measurement)
Communication interface RS-485 (Modbus RTU, optional)
Installation method: DIN rail or panel installation (compact design, suitable for small spaces)
Size 100 x 120 x 80 millimeters
Compliance with CE, UL, IEC 60947-4-1

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SR489-P5-LO-A20-E

Main features and advantages:
Choosing SR489-P5-LO-A20-Ecan bring tangible value to operators and maintenance teams:
Economically efficient protection: This relay focuses on core functions such as overload and phase faults, providing basic protection at a lower cost than fully functional models. For example, in sewage treatment plants, it can protect pumps from damage caused by impeller blockage without the need for advanced analytical functions, thereby reducing upfront investment.
Simplified maintenance: The LED indicator light and intuitive interface of this relay make it easy to diagnose problems in the factory workshop. For example, flashing fault lights can quickly indicate overload conditions, allowing technicians to address the root cause (such as motor misalignment) before equipment failure occurs, thereby reducing the mean time to repair (MTTR) by up to 30%.
Energy monitoring: 4-20 mA output supports basic energy tracking, which helps identify low efficiency situations such as low load operation. In food processing plants, this may lead to the replacement of smaller motors or the adoption of variable frequency drives (VFDs), thereby reducing energy costs by 10-15%.

SR489-P5-LO-A20-E

Application areas:
SR489-P5-LO-A20-E performs well in industries that prioritize simple motor protection:
Municipal water supply system: used to protect pumps in the water supply network. The phase imbalance detection function of this relay can prevent damage caused by remote pump station wiring faults and ensure continuous water supply.
Lightweight manufacturing industry: suitable for conveyor belts in packaging production lines. Its stall protection function can prevent the motor from overheating when the conveyor belt gets stuck, thereby minimizing downtime during product conversion or maintenance.
HVAC system: installed in the air handling unit (AHU) to monitor the fan motor. The thermal model can alert operators before expensive fan failures occur due to bearing wear or misalignment, thereby maintaining indoor air quality and energy efficiency.

SR489-P5-LO-A20-E

Related products:
SR469-P5-HI-A20-E: Equipped with advanced analysis capabilities, Ethernet connectivity, and RTD input for monitoring stator temperature (suitable for critical motor applications such as oil and gas).
SR489-P5-LO-A20: No “E” (enhanced) functionality, such as simplified LED indicator lights and no Modbus support (suitable for over budget applications).
SR489-P5-LO-A20-E-NEXT: Extended temperature model (-40 ° C to+70 ° C), suitable for outdoor or harsh environments such as mining sites.
SR489-P5-LO-A20-E-2AO: Equipped with two analog outputs, it can simultaneously monitor current and power factor.

Installation and maintenance:
Before installation:
Verify CT compatibility (5A secondary side) and ensure that the control power supply matches the input range of the relay.
Install the relay in a well ventilated area to avoid thermal stress in the enclosed MCC.
For Modbus settings, the baud rate (default: 9600) and slave address can be configured through the front panel buttons.

Daily maintenance:
Check the CT connection for tightness every quarter, as loose wires may cause inaccurate readings.
Simulate faults and verify alarm functions (such as tripping circuit breakers or triggering HMI alarms) using the test button of the relay.
In dusty environments, clean the ventilation openings of relays annually to prevent heat accumulation.

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