Frequency

Over and underfrequency monitoring relay, frequency nominal range 50-60 Hz, voltage nominal range 24-240 V AC, delay on alarm 0.1-30 s, 1 SPDT relay output, 22.5 mm DIN-rail housing

Over and underfrequency monitoring relay, frequency nominal range 50-60 Hz, voltage nominal range 24-240 V AC, delay on alarm 0.1-30 s, 1 SPDT relay output, 36 mm plug-in housing

Over and underfrequency monitoring relay, frequency nominal range 50-60 Hz, voltage nominal range 115/230 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing

Over and underfrequency monitoring relay, frequency nominal range 50-60 Hz, voltage nominal range 24/48 V AC, delay on alarm 0.1-30 s, 2 SPDT relay outputs, 45 mm DIN-rail housing