Dold Frequency Monitoring Relay, SPDT, DIN Rail

View all Monitoring Relays

Subtotal (1 unit)*

£226.58

(exc. VAT)

£271.90

(inc. VAT)

Add to Basket
Select or type quantity
Temporarily out of stock
  • Shipping from 20 November 2025
Need more? Click ‘Check delivery dates’ to find extra stock and lead times.
Units
Per unit
1 +£226.58

*price indicative

RS Stock No.:
181-2792
Mfr. Part No.:
MK9143N.38 +/-5Hz UH=AC230V tv=0-20s tan=0-30s
Brand:
Dold
Find similar products by selecting one or more attributes.
Select all

Brand

Dold

Monitoring Application

Frequency

Contact Configuration

SPDT

Mounting Type

DIN Rail

Time Delay

0 → 20 s, 0 → 30s

Frequency Sensing Range

±5Hz

Series

MK9143N

Frequency Sensitivity

Overfrequency, Underfrequency

Dimensions

97 x 22.5 x 90mm

Minimum Frequency Sensed

-5Hz

Length

97mm

Maximum Frequency Sensed

+5Hz

Maximum Operating Temperature

+60°C

Width

22.5mm

Height

90mm

Minimum Operating Temperature

-20°C

Operating Temperature Range

+60°C

Terminal Type

Screw

COO (Country of Origin):
DE
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

Related links