MACX-MR Monitoring Relays

Oct. 27, 2023
Phoenix Contact's monitoring relays offer two methods of operation: Either with OLED and keys or with a smartphone app via NFC.

2023 NED Innovation Award Finalist

MACX-MR monitoring relays protect equipment from damage and undesirable operating states. The relays offer clear, fast, and accurate commissioning thanks to the onboard OLED display. The slim form factor saves DIN rail space and optional programming via NFC saves time thanks to the ability to save and upload configuration profiles.


Available voltage monitoring relays ensure your system is powered by the correct voltage, while phase monitoring relays can ensure the correct rotation/direction of operation of 3-phase equipment and protect 3-phase motors from voltage imbalances or phase loss. Voltage monitoring relays in the MACX-MR range also have a built-in log function that records the last five disturbances for rapid troubleshooting of system issues. 


Current monitoring relays allow for the rapid detection of burnouts and failures of heat traces and lights or the under/overloading of motors. Voltages up to 600V AC/DC single phase and up to 900V AC 3-phase, as well as currents up to 10 A AC/DC, can be monitored with ease.

  • 24 to 240V AC/DC integrated power supply, isolated from the measuring input
  • Setting accuracy: 1% of the set value
  • Operating temperature: (-25 to 70°C)
  • CE, CCC, UL
  • Compliance with railway standard EN 50155, GB/T 25119
  • High-contrast OLED display with keys as well as an app for NFC communication for making settings directly without having to check and calculate
  • Comprehensive error logging and error retrieval as well as configurable output contacts to distinguish between different errors
  • Single-channel extended measuring range to avoid wiring errors for the customer
  • Electrical isolation ensures a high degree of safety and accuracy