Description
Product Overview
The GE SR469-P5-H-A20-T is a sophisticated, multifunctional motor protection relay, a key component within GE’s (now part of ABB) Multilin™ SR series of advanced protection and management devices. This specific model is engineered to provide comprehensive protection, control, and monitoring for medium-voltage AC induction and synchronous motors. The designation «SR469-P5-H-A20-T» indicates its exact configuration: «SR469» is the series, «P5» denotes a specific set of protection functions and I/O, «H» likely indicates a high-resolution display or specific HMI, «A20» specifies the current transformer (CT) input rating (likely 5A secondary), and «T» may indicate a communication or mounting option. Its primary mission is to safeguard motors against a wide array of electrical and mechanical faults, including overload (with sophisticated thermal modeling), locked rotor, short circuit, phase unbalance/loss, ground fault, jam, undercurrent, and excessive starts. By continuously monitoring motor current, voltage, and other derived parameters, it can initiate a precise trip or alarm to prevent costly motor failures and unplanned downtime.
Beyond core protection, the GE SR469-P5-H-A20-T serves as a powerful motor management center. It provides detailed metering of essential parameters like current, voltage, power, power factor, energy consumption, and motor thermal capacity used, offering invaluable insights for energy management and predictive maintenance. Equipped with programmable logic functions and multiple digital inputs/outputs, it can execute complex control sequences (e.g., start/stop, auto-changeover) and integrate seamlessly into automation networks via built-in communication ports like Ethernet and multiple serial protocols. For system designers and plant maintenance teams, the SR469-P5-H-A20-T represents a future-proof investment that enhances motor reliability, optimizes energy usage, and provides deep diagnostic visibility into motor health, all within a single, intelligent device.
Technical Specifications
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Parameter Name
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Parameter Value
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Product Model
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GE SR469-P5-H-A20-T
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Manufacturer
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GE (now part of ABB’s Electrification business)
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Product Series
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Multilin™ SR Series
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Product Type
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Advanced Motor Protection Relay (Intelligent Electronic Device — IED)
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Motor Compatibility
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3-Phase AC Induction and Synchronous Motors
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Current Input
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5A secondary from Current Transformers (CTs) [denoted by ‘-A20’]
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Voltage Input
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Supported via optional Voltage Transformers (VTs) for enhanced metering & protection (e.g., V/Hz, power measurement)
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Protection Functions
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Thermal Overload (I²t with separate heating/cooling curves), Locked Rotor, Short Circuit (Instantaneous & Time-delayed), Ground Fault (50G/51G, sensitive), Phase Unbalance/Loss, Jam, Underload, Restart Inhibit, Excessive Starts, Starts per Hour, Time Between Starts.
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Measurement Parameters
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True RMS Phase & Ground Currents, Phase Voltages, % Thermal Capacity Used, kW, kVAR, kVA, Power Factor, Frequency, Energy (kWh, kVARh), Motor Run Time, Starts Count.
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Control I/O
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Multiple programmable Digital Inputs (for status/commands) and Relay Outputs (for trip, alarm, control).
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Communication Ports
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Typically includes: 1x Ethernet (Modbus TCP/IP, DNP3 TCP, IEC 61850), 2x RS-485 serial (Modbus RTU, DNP3, Profibus DP).
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Display
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High-resolution, backlit LCD with graphical interface and keypad navigation.
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Power Supply
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Wide-range AC/DC supply (e.g., 24-240V AC/DC, 50/60 Hz).
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Programmable Logic
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Built-in logic engine for creating custom control schemes without external PLC.
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Event Recorder
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Extensive oscillographic and sequence of events (SOE) recording for fault analysis.
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Operating Temperature
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-25°C to +70°C (-13°F to +158°F)
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Certifications
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cULus, CE, ATEX/IECEx (for hazardous locations when appropriately installed).
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Key Features and Advantages
GE SR469-P5-H-A20-T stands out due to its advanced, adaptive thermal protection model. Unlike fixed-characteristic overload relays, it calculates motor heating in real-time based on actual current, accounting for cooling during off periods and prior starts. This «I²t with Thermal Capacity» modeling provides optimal protection, preventing nuisance trips during legitimate high-inertia starts while safeguarding against sustained overloads, significantly extending motor life. Specialized functions like jam detection and phase unbalance protection offer additional defense against mechanical failures and supply-side issues.
Comprehensive monitoring and diagnostic intelligence transform it from a protector into a management hub. The relay acts as a high-accuracy multi-function meter, providing data crucial for energy audits and identifying inefficient operation. The detailed event log with time-stamped waveforms captures the sequence of events and electrical conditions leading to a trip, which is invaluable for rapid root-cause analysis. Its programmable logic and flexible I/O allow customization of control schemes (e.g., auto-reset, two-wire control, load shedding) and integration with external devices, reducing the need for additional PLCs and simplifying panel design.
Enhanced connectivity, security, and ease of use are key benefits. The built-in dual Ethernet and serial ports with support for IEC 61850 enable seamless integration into modern SCADA, DCS, or asset management systems for remote monitoring and control. The intuitive graphical LCD interface allows for easy local configuration and real-time data viewing. Advanced cyber-security features help protect critical motor control assets. The relay’s wide-range power supply and robust industrial design ensure reliable operation in diverse electrical environments. For engineers, the SR469-P5-H-A20-T offers a single-device solution that improves protection, provides actionable intelligence, facilitates predictive maintenance, and future-proofs motor control centers (MCCs).
Application Areas
GE SR469-P5-H-A20-T is engineered for the protection and management of critical medium-voltage and large low-voltage motors across a wide range of industries.
In water and wastewater treatment, it is essential for safeguarding large raw water intake pumps, high-service pumps, and aeration blowers. Within manufacturing and processing—such as chemicals, plastics, and metals—it protects motors driving mixers, conveyors, extruders, compressors, and fans. Its jam protection is particularly useful for detecting blockages.
In oil & gas operations, it protects pumps, compressors, and offshore drilling equipment. For mining and aggregate processing, the relay is deployed on crushers, ball mills, and heavy-duty conveyor drives. In power generation, it manages critical motors for induced/forced draft (ID/FD) fans, boiler feed pumps, and cooling water systems. Essentially, the SR469-P5-H-A20-T is the ideal choice for any three-phase AC motor that is a significant asset, costly to repair or replace, and critical to continuous operation or process safety, particularly where energy monitoring, network connectivity, and advanced diagnostics are desired.
Related Products
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GE Multilin™ SR469 (other variants): Models with different CT inputs (e.g., 1A), I/O counts, or communication options.
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GE Multilin™ SR750 Feeder Protection Relay: A device from the same family for feeder/bus protection, often used in the same switchgear.
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Current Transformers (CTs) & Voltage Transformers (VTs): External sensors sized to the motor’s full-load current and voltage.
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GE UR Family (UR) Protective Relays: GE’s utility-grade protection platform, representing a different product line.
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GE Multilin™ EnerVista Software Suite: PC-based configuration, monitoring, and analysis tools for setting up protection parameters, retrieving data, and analyzing events from the SR469.
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GE Communication Modules/Gateways: Additional hardware for specific protocol conversion if needed.
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GE Motor Starters (Contactors, Soft Starters, VFDs): The primary switching devices controlled by the relay’s output contacts.
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GE Power Monitoring/Energy Management Systems: Higher-level systems that can aggregate data from multiple SR469 relays.
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