Description

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Product Overview

The GE SR469‑P5‑HI‑A20 Motor Management Relay is an advanced motor protection and management relay from the GE Multilin 469 series, designed to monitor, protect, and control medium- and large-size three-phase motors used in industrial power systems. It integrates protective functions, metering, diagnostics, and communication into a single relay used in motor control centers and switchgear panels.

This relay continuously measures motor electrical parameters and automatically trips or alarms when abnormal conditions occur (such as overload, ground fault, or phase imbalance), helping prevent motor damage and production downtime.

Key Technical Specifications

Model: SR469-P5-HI-A20

Manufacturer: GE Multilin (GE Grid Solutions)

Relay Type: Motor Management / Protection Relay

Phase CT Inputs: 5 A secondary CT inputs

Control Power:

70–265 VAC, 48–62 Hz

90–300 VDC

Analog Outputs: 4 channels (4–20 mA)

Communication: RS-485 Modbus RTU (front port for configuration)

RTD Inputs: Up to ~12 temperature sensor inputs

Operating Temperature: approx. –20 °C to +60 °C

Mounting: Panel-mounted relay (switchgear / MCC)

Main Protection Functions ⚡

The relay includes a wide set of motor protection algorithms such as:

Thermal overload protection

Locked-rotor / stall protection

Ground-fault protection

Phase loss / phase imbalance protection

Over-/under-voltage protection

Over-/under-frequency monitoring

Under-load protection

Start-inhibit and restart control

These functions are based on motor thermal models and real-time electrical measurements to ensure accurate protection during start-up, running, or abnormal conditions.

Monitoring & Control Features 📊

Real-time metering of current, voltage, power, frequency, torque, and energy

Motor temperature monitoring via RTD sensors

Event recorder and diagnostics

LCD display with keypad for configuration

Integration with SCADA/DCS systems via communication ports

Typical Applications 🏭

This relay is commonly used for protecting large motors in:

Oil & gas facilities

Power plants

Mining and heavy industry

Water & wastewater pumping stations

Large compressor or fan drives

Medium-voltage motor control centers (MCC)

✅ In simple terms:
The GE SR469-P5-HI-A20 is a digital motor protection relay that monitors the electrical and thermal condition of large motors and trips the circuit breaker when dangerous operating conditions occur, preventing costly motor failures.