Woodward HighPROTEC MRU4 A0AA 5X00846G01 Voltage Protection Relay

The Woodward HighPROTEC MRU4 A0AA (5X00846G01) is a digital voltage and frequency protection relay built with dual-core processor architecture. It continuously monitors three-phase grid voltage and frequency to protect generators, transformers and distribution equipment against overvoltage, undervoltage, voltage unbalance and frequency deviation faults.

This A0AA variant adopts flush door mounting design without built-in communication interface. It integrates complete ANSI protection functions, local HMI operation and fault recording. Compact construction enables installation inside medium voltage switchgear cabinets for distributed power systems maintenance and spare part replacement.

Main Specifications

• Brand: Woodward HighPROTEC
• Model: MRU4 A0AA, Part No. 5X00846G01
• Device Type: Voltage & Frequency Protection Relay
• Mounting Form: Flush door mounting (A housing type)
• Communication: No built-in communication interface
• Voltage Measurement Range: 0 ~ 800 VAC
• Standard Protection Functions: ANSI 27, 59, 59N, 47, 81U/O, ROCOF
• I/O Configuration: 8 digital inputs, 6 relay binary outputs
• Operating Temperature: -20°C ~ +60°C
• Configuration Software: Woodward Smart View

Core Functions

• Real-time monitoring of three-phase voltage and system frequency parameters
• Overvoltage, undervoltage, residual voltage and voltage asymmetry protection
• Overfrequency, underfrequency and ROCOF rate-of-change frequency protection
• Voltage transformer supervision and trip circuit monitoring logic
• Customizable programmable logic, alarm and trip threshold parameters
• Built-in fault recorder, event log and disturbance waveform capture
• Local HMI for parameter setting, status browsing and fault inquiry
• Multiple relay contacts for alarm signaling and circuit breaker tripping
• Integrated fault simulator for convenient on-site commissioning and testing
• Continuous self-diagnosis to detect internal hardware abnormal conditions

Application Scenarios

• Medium voltage distribution cabinet voltage protection control systems
• Cogeneration generator grid connection interface protection devices
• Photovoltaic and wind farm grid voltage monitoring relays
• Industrial factory internal medium voltage power distribution networks
• Mining and water treatment plant power supply protection cabinets
• Petrochemical plant auxiliary power grid monitoring equipment
• SF6 compact switchgear built-in protection and monitoring units
• Microgrid voltage stability supervision and protection control
• Woodward HighPROTEC protection system upgrade and spare parts exchange
• Commercial complex medium voltage power distribution automation projects