| Type of automation module | voltage monitoring relay |
| Symbol | Manufacturer | Usup | Contacts layout | Controlled parameter range | IP rating | Mounting | Leads | Additional functions | Operating temperature |
|---|---|---|---|---|---|---|---|---|---|
| [V AC] | [V AC] | [°C] | |||||||
| SZR-277 | F&F | 85...265 | NO x3 | 150...270 | IP20 | for DIN rail mounting | screw terminals | LED status indicator | -25...50 |