| Item Description | Frequency monitoring, plug-in module, SPDT / over/under frequency monitoring relays measuring if power supply frequency is within set limits measure on own power supply measuring ranges voltage: 24 to 240 VAC frequency: 50 - 60 HZ separately adjustable upper/lower level on relative scale adjustable delay on alarm or on recovery (0.1 to 30 s) programmable latching or inhibit at set level output: 8 A SPDT relay n.d. Or n.e. Selectable for mounting on DIN-rail in accordance with DIN/EN 50 022 (DFB01) or plug-in module (PFB01) 22.5 MM EURONORM housing (DFB01) or 36 MM plug-in module (PFB01) LED indication for relay, alarm and power supply on |