Description

Woodward MFR11 Protection Relay (PN: MFR 11 / XM11) Product Description

Technical Specifications

• Product Model: MFR11 (often abbreviated XM11)
• Brand: Woodward (Power System Protection & Monitoring Relay)
• Warranty: One Year
• Input Voltage: Universal auxiliary supply 24–250 V AC/DC; voltage measurement range 100/400/690V, CT secondary 1A/5A
• Operating Temperature: -20°C to 60°C (-4°F to 140°F)
• Storage Temperature: -40°C to 85°C (-40°F to 185°F)
• Response Time: Fast configurable tripping delay for overcurrent, earth fault and grid abnormal conditions
• Protection Class: IEC 60255 certified, IP54 front panel, IP20 rear housing, full EMC surge, ESD and noise suppression
• Accuracy Class: 0.5S high precision electrical measurement, 12-bit analog conversion resolution
• Output Frequency: 50Hz / 60Hz grid adaptive, harmonic monitoring up to 20th order
• Rated Current Range: Low steady-state operating current, 4–20mA analog output maximum load 500Ω
• Communication Interface: RS485 serial port, multi-group relay trip contacts, front LCD display and LED status indicators
• Supported Protocols: Modbus RTU, IEC 60870-5-103, internal fault event recording protocol
• Overload Capacity: Complete suite of ANSI/IEC protection functions, watchdog self-test, overvoltage/short-circuit lockout, disturbance waveform recorder
• Dimensions: Standard panel flush mounting enclosure, cutout size 249mm × 183mm
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Product Overview

The Woodward MFR11 (XM11) is a multifunctional numerical protection relay dedicated to medium and low voltage power distribution networks, generator sets, transformers and motor feeder protection. It integrates comprehensive protection algorithms including phase overcurrent, residual earth fault, phase unbalance, over/under voltage, frequency deviation, reverse power and anti-islanding protection, fully complying with international IEC and ANSI industry standards. Equipped with scalable analog output channels supporting 0–20mA or 4–20mA signals, it transmits real-time electrical parameters to PLC, DCS and local indicator meters. The embedded event logger records fault timestamps, trip causes and waveform snapshots for post-incident analysis and equipment maintenance.