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1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
• Non-volatile memory for
• up to 60 event codes
• setting values
• disturbance recorder data
• recorded data of the five last events with time stamp
• number of starts for each stage
• alarm indication messages and LEDs showing the status at the moment of
power failure
• Three accurate voltage inputs
• Galvanically isolated binary input with a wide input voltage range
• All settings can be modified with a personal computer
• HMI with an alphanumeric LCD and manoeuvring buttons
• IEC 60870-5-103 and SPA bus communication protocols
• Two normally open power output contacts
• Two change-over signal output contacts
• Output contact functions freely configurable for desired operation
• Optical PC-connector for two-way data communication (front)
• RS-485 connector (rear) for system communication
• Continuous self-supervision of electronics and software. At an internal relay
fault (IRF), all protection stages and outputs are blocked.
• User-selectable rated frequency 50/60 Hz
• User-selectable password protection for the HMI
• User-selectable nominal voltage 100/110/115/120 V
• Display of primary voltage values
• Demand values
• Multi-language support
1.4. Guarantee
Please inquire the guarantee of your nearest ABB representative.
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