The ABB CM-EFS.2S Single-Phase Voltage Monitoring Relay is designed to provide robust protection for electrical systems by monitoring voltage levels and ensuring they remain within safe limits. This versatile relay operates with a wide control supply voltage range of 24-240V AC/DC, making it suitable for various applications. It features a 2 c/o (SPDT) output with contacts rated at 250V/4A, allowing for flexible configuration options. The relay employs an RMS measuring principle for both DC and AC voltages, offering four measuring ranges: 3-30V, 6-60V, 30-300V, and 60-600V.
The CM-EFS.2S is equipped with window monitoring for over- and undervoltage conditions, and users can select between ON- or OFF-delay, open- or closed-circuit operating principles, with or without a latching function. The output contacts can be configured for common or separate signal operation, providing tailored responses to minimum and maximum threshold breaches. The device features a fixed hysteresis of 5% of the threshold value, with adjustable tripping and start-up delays ranging from instantaneous to 30 seconds.
For added security, a sealable transparent cover is available to prevent unauthorized adjustments. The relay's screw connection technology with double-chamber cage connection terminals ensures secure and reliable connections. Certified by UL, GL, GOST, CB, RMRS, and CCC, the ABB CM-EFS.2S is a dependable choice for safeguarding single-phase electrical systems.