Woodward SEG MRG3D Universal Mains Decoupling Relay Generator Protection Module
🔹 SEG Woodward MRG3D Universal Mains Decoupling Relay
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Product overview
The Woodward SEG MRG3D is a universal mains decoupling and generator protection relay designed for generator sets operating in parallel with the utility grid. It provides reliable detection of mains failures and instantly disconnects the generator to prevent damage or back-feeding. ⚙️ Key Features Mains Decoupling Protection – Detects mains failure via vector surge and frequency gradient (df/dt) methods for ultra-fast tripping. Over / Under Voltage & Frequency Protection – Multi-step supervision of voltage and frequency to ensure stable generator operation. Vector Surge Detection – Responds to sudden phase vector changes for immediate isolation from the grid. Frequency Gradient Monitoring (df/dt) – Measures rate of frequency change to detect islanding or loss of mains conditions. Overcurrent & Earth Fault Protection – Provides comprehensive protection for generator circuits (depending on variant). Residual Voltage and Directional Earth Fault Options – Ideal for isolated or compensated neutral systems. Event Recording & RS-485 Communication – For easy parameter setting, data logging, and remote monitoring. ⚡ Technical Specifications Model: MRG3D Manufacturer: SEG Electronics Function: Universal mains decoupling & generator protection relay Frequency: 50 Hz / 60 Hz Mounting: Panel / flush type (D-type housing) Communication: RS-485 interface (Modbus RTU) 🏭 Typical Applications Power plants and industrial generator systems Parallel operation of gensets with utility mains Renewable energy plants and cogeneration systems Decoupling protection for grid-connected generators 📦 Condition Used / Tested ✅ Key Benefits Fast and reliable mains decoupling Prevents generator damage and grid instability Easy to configure and monitor Backed by Woodward’s proven SEG technology 🔹 Shipping & Warranty: 🚚 Fast and secure shipping ✅ 30-day return policy 💬 Need help? Contact us anytime!
Technical details
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