The GE Multilin 269 Plus (269-PLUS-D/O-100P-125V) is a classic, field-proven motor protection relay designed to provide comprehensive, reliable safeguarding for medium-voltage AC induction motors. Although it is a legacy product, it remains widely utilized in industrial facilities globally due to its robust design and simple, effective protection logic. It provides essential monitoring for thermal capacity, phase current imbalances, and ground fault conditions, ensuring that critical motor assets are protected from electrical stress and mechanical failure.

Technical Specifications

Operational & System Features

• ⚙️ System Compatibility: Engineered for standard Motor Control Center (MCC) architectures and switchgear integration.

• 🌡️ Protection Logic: Features programmable thermal overload curves that simulate the motor’s actual heating and cooling behavior.

• ⚡ Sensor Interface: Specifically configured for 100-ohm platinum RTD (100P) inputs, allowing for precise temperature-based motor biasing.

• 🛡️ Operational Voltage: Designed for a 125V control power supply, common in established substation and industrial plant control circuits.

• 📊 Diagnostic Capability: Provides front-panel metering of motor current and status indicators to assist operators in rapid troubleshooting and maintenance.

Physical & Origin Details

• 📏 Dimensions: Standard panel-mount enclosure designed for easy integration into existing switchgear panels.

• ⚖️ Weight: Durable metal and industrial-grade plastic construction, weighing approximately 2.0 kg to 2.5 kg.

• 🌍 Origin: Built to rigid utility and industrial standards for long-term service life.

Key Protection Features

The 269 Plus series provides several layers of protection essential for industrial motor longevity:

• Thermal Overload: Prevents motor burnout by tracking I2t thermal accumulation.

• Phase Unbalance: Detects current asymmetry that could lead to excessive rotor heating.

• Locked Rotor: Monitors startup conditions to prevent damage during high-current stall scenarios.

• RTD Biasing: Uses real-time temperature feedback from the motor windings to dynamically adjust the trip threshold.

• Ground Fault Detection: Monitors for leakage current to prevent damage to motor insulation and core laminations.

Recommended Migration Path

Since the 269 Plus is a legacy model, many industrial sites are moving toward modernized replacements to gain enhanced communication and predictive diagnostic capabilities. If you are planning an upgrade, consider these current-generation GE Multilin relays:

• Multilin 369 – The direct functional successor, featuring improved thermal modeling and integrated communication ports.

• Multilin 469 – An advanced relay for large, mission-critical motors that require enhanced security and logic.

• Multilin 869 – Next-generation protection featuring high-speed processing and arc-flash detection.