Woodward MRU4-2A0AAA highPROTEC Voltage & Frequency Protection Relay

Product Description
MRU4-2A0AAA is Woodward highPROTEC MRU4 series digital voltage and frequency protection relay. This variant is door flush mounting type, standard hardware configuration, no built-in communication protocol. It is designed for monitoring and protection of generator sets, busbars and medium/low voltage power systems against abnormal voltage and frequency conditions.

Key Features

• Core protection functions: overvoltage, undervoltage, overfrequency, underfrequency, rate-of-change of frequency (df/dt)
• 8 digital inputs and 6 relay binary outputs for alarm and breaker tripping control
• Voltage measurement range up to 800V AC, high accuracy sampling and fault recording
• Local large display for measured values, fault messages and parameter settings
• Flush door mounting housing, standard environmental version without conformal coating
• Event records and disturbance recorder for post-fault analysis
• Programmable logic, configurable tripping delays and alarm thresholds
• Model suffix AAA: no communication interface, standard hardware, standard coating

Application Scenarios

• Generator busbar voltage & frequency supervision for genset power plants
• Islanding detection and grid connection protection for small power generation systems
• Medium voltage switchgear, capacitor bank protection
• Industrial power distribution, backup power supply monitoring systems
• Hydropower, diesel generator synchronization protection

FAQ

Q: Does MRU4-2A0AAA support Modbus or Ethernet communication?
A: No. The suffix AAA means no communication interface. Choose variants ending with B/C for RS485 or Ethernet communication.

Q: What is the main protection task of MRU4?
A: It is dedicated voltage and frequency protection relay, mainly used for grid/generator abnormal voltage and frequency monitoring, islanding protection.

Q: What software is used for MRU4 configuration?
A: Woodward highPROTEC PC tool for parameter setting, firmware update and fault waveform reading via front USB port.