ABB – CM-UFS.1 (1SVR630736R0300) – Three-Phase Grid Feeding Monitoring Relay

The ABB CM-UFS.1 (1SVR630736R0300) is a three-phase monitoring relay designed specifically for grid feeding applications, ensuring safe and compliant connection of decentralized energy sources to the public grid. This relay monitors key grid parameters such as voltage, frequency, and phase failure in accordance with DIN V VDE V 0126-1-1: February 2006. It is powered directly by the measuring circuit and provides two changeover (SPDT) contacts for control and signaling.

The device operates on a rated control and measuring voltage of 3 x 400 V AC (L-L) / 230 V AC (L-N) and is suitable for both three-phase and single-phase mains monitoring. It features adjustable threshold values for the 10-minute average voltage (110–115% of Us), fixed thresholds for overvoltage, undervoltage, overfrequency, and underfrequency, and configurable neutral conductor connection. The relay includes start-up and restart delays (30 s fixed), true RMS measurement, and front-accessible configuration and status LEDs for easy setup and diagnostics.

Key Features:

• Grid feeding monitoring for decentralized energy sources

• Rated voltage: 3 x 400 V AC (L-L) / 230 V AC (L-N)

• 2 SPDT (changeover) contacts for control and signaling

• True RMS measuring principle for accurate detection

• Monitors: Overvoltage, undervoltage, overfrequency, underfrequency, phase failure

• Adjustable 10-minute average voltage threshold (110–115% Us)

• Start-up and restart delay: 30 s fixed

• Configurable neutral conductor connection

• Front-panel LEDs for relay status and fault indication

• DIN rail mounting (22.5 mm width)

• Degree of protection: IP50 (enclosure), IP20 (terminals)

• Compliant with DIN V VDE V 0126-1-1:2006

• Compact dimensions: 22.5 × 78 × 100 mm