This mains monitoring relay monitors three-phase networks for phase sequence, phase failure, undervoltage and overvoltage. Two relay changeovers are available for reporting, which can be loaded up to 8 A. A limit value is available for undervoltage and overvoltage, and a response or drop-out delay can be set for the output. The settings are made using controls on the front, which can be protected against changes under a transparent cover. An illuminated scale arrow makes it very easy to see the setting of the potentiometers, even from a distance. The diagnostic switch on the front enables the output relays to be switched off to test the entire application. When the transparent cover is closed, the diagnostic switch is automatically reset. Three LEDs show the status. The width is 22.5 mm and it is mounted on a top-hat rail. The line is connected via screw terminals.
| Property | Value |
| Number of contacts as normally open: | 2 |
| Number of contacts as normally closed: | 2 |
| Design of the electrical connection: | Screw connection |
| Type of voltage for actuation: | AC |
| Max. permissible release delay time: | 30 s |
| Number of contacts as changeover contacts: | 2 |
| Max. permissible response delay time: | 30 s |
| Width: | 22 mm |
| Height: | 90 mm |
| Depth: | 73 mm |
| Overvoltage detection function: | yes |
| Rated control supply voltage Us at AC 50 Hz: | 480 V |
| With removable terminals: | no |
| Phase sequence monitoring function: | yes |
| Phase failure detection function: | yes |
| Undervoltage detection function: | yes |
| Asymmetry detection function: | no |
| Voltage measuring range: | 576 V |
| Rated control supply voltage Us at AC 60 Hz: | 480 V |
