The CM-SFS.21S Is A Single-Functional Current Monitoring Relay From The CM Single-Phase Monitors Range. This Monitoring Relay Operates With A Rated Control Supply Voltage Of 24 – 240 V AC / DC And Has A 2 C/O (SPDT) Output With Contacts Rated At 250 V / 4 A. It Provides A RMS Measuring Principle For DC And AC Currents With 3 Measuring Ranges: 3-30 MA, 10-100 MA And 0.1-1 A. The CM-SFS.21S Offers Window (Over- And Undercurrent) Monitoring As Well As Selection Of ON- Or OFF-Delay, Open- Or Closed-Circuit Operating Principle, With Or Without Latching Function. The Output Contacts Can Be Configured As 1×2 C/O (SPDT) (Common Signal) Or 2×1 C/O (SPDT) (Separate Signal For Minimum And Maximum Thresholds) Operation. The Hysteresis Is Fixed At 5 % Of The Threshold Value. The Tripping Delay And The Start-Up Delay Are Adjustable Over A Range Of Instantaneous To 30 S (0, 0.1-30 S). A Sealable Transparent Cover For Protection Against Unauthorized Changes Is Available As Accessory. The Device Offers Screw Connection Technology With Double-Chamber Cage Connection Terminals.

• · Single Phase Monitors