Description

1. Product Title

Woodward‑SEG MRN3‑11D‑ Generator Grid‑Coupling Multifunctional Protection Relay

2. Product Overview

MRN3‑11D is a compact multifunctional grid decoupling protection relay for distributed and small‑medium generator grid‑parallel systems. It monitors AC grid voltage, frequency and vector surge conditions, detecting grid fault events such as over‑voltage, under‑voltage, over‑frequency and under‑frequency. When abnormal grid parameters occur, it triggers fast relay trip output to safely decouple generator sets from public utility networks and protect generator hardware. DIN‑rail housing fits standard control cabinets; front‑panel indicators show operating, alarm and trip status for fast on‑site troubleshooting. This unit is widely used for diesel/gas generator grid‑connection safety protection in industrial power plants and distributed energy sites.

3. Technical Specifications

• Brand: Woodward‑SEG
• Model: MRN3‑11D
• Warranty: One Year
• Condition: 100% New & Original
• Core Functions: Over/under‑voltage, over/under‑frequency, vector surge grid decoupling protection
• Response Time: ≤80 ms fault detection
• Accuracy: ±0.5% for voltage & frequency measurement
• Power Supply: 24 VDC nominal
• Output: Configurable trip & alarm relay contacts
• Indicators: Front‑panel LED status indication
• Mounting: DIN‑rail TH35 mounting
• Operating Temp: ‑25 °C ~ +70 °C
• Protection Class: IP20
• 

4. Application Scenarios

• Industrial Diesel / Gas Generator Grid‑connection Cabinet: Grid‑decoupling protection relay spare for parallel‑generation safety assemblies.
• Distributed Energy Power‑generation Skid: Replacement multifunctional protection unit for small‑scale generator sets.
• Woodward‑SEG MR‑series Protection‑system Maintenance: Drop‑in spare for installed MRN3‑11D hardware.