Dold Frequency Monitoring Relay, SPDT, DIN Rail

Monitoring of local generator sets and voltage supplies
For precise frequency measuring with fast response time
High disturbance immunity
Separately adjustable trip points and separate outputs for over-
and under frequency (1 or 2 c/o each)
MK 9143N / MH 9143:
Trip points adjustable precisely and reproducible on 10 step rotational switch in the range of ± 0,1 Hz to ± 5 Hz related to 50 or 60 Hz
Nominal frequency 50 or 60 Hz selectable
Fixed hysteresis optimised for trip point
As option one common output for under and over frequency “Window”-mode (MK 9143N/400 / MH 9143/400)
Variable alarm value in the range of 45 to 65 Hz
Hysteresis adjustable for under- and over frequency separatelyadjustable 0 …20% Common output for under and over frequency “Window”-mode can be selected
Start up delay 0…30 s selectable
Manual or auto reset selectable
Output relay energized or de-energized on trip selectable for
over frequency
Output relay de-energized on trip for under frequency
Universal frequency measuring input for AC 40 … 550V
Several options for auxiliary supply
LED indicators for auxiliary supply, input frequency, over and
under frequency alarm