Mains monitoring

Mains monitoring

DOLD’s monitoring relays monitor reliably fault conditions and disturbances in 1- and 3-phase networks up to 3AC690V. Monitoring can be 3-phase undervoltage in 3- or 4-wire installations, phase failure/-sequence/-asymmetry and neutral monitoring. Alarm LEDs and relay outputs are provided with potential free change over contacts.

Select Category:

MK 9837N

Detection of over- or under frequency of alternating voltage (1,5 – 600 Hz)

Measuring range AC 15 … 280 V/30 … 550 V

As option with measuring input for inverters

Adjustable hysteresis

Adjustable start up time delay 0 … 50 s at function under frequency

2 changeover contacts

MK 9143N

Monitoring of 50/60 Hz current supply on over- and under frequency

Monitoring of local generator sets and voltage supplies

Start up delay 0…30 s selectable

Universal freguency measuring input for AC 40 … 550 V

Output 2 changeover contacts

RL 9075

To monitor fuses in single and 3-phase AC voltage systems with neutral

Adjustable operating voltages: 400 V / 230 V and
230 V / 130 V and 110 V / 64V

Under voltage detection below 0.8 x UB

Fast detection of a blown fuse

No separate auxiliary necessary

Output: 1 changeover contact

De-energized on trip

Adjustable switching delay

IL 9075

Recognizes fuse failures in three-phase mains
up to 3 AC 690 V

Can be used for all types and sizes of fuses

Independent of phase sequence

Signals even if loads are switched off

Shorter response time than with motor circuit-breakers

Green LED for intact fuses

Red LED for fuse failure

As option: 1 NO contact or 2 changeover contacts

UG 9075

To monitor fuses in single and 3-phase AC voltage systems

Under voltage detection below 0.7 x UN

No separate auxiliary necessary

2 changeover contacts

2 nominal voltages adjustable:

3/N AC 240 V / 140 V or 3/N AC400 V / 230 V or

fixed nominal voltage: 3/N AC 110 V / 64 V

Adjustable operate delay

Energized on trip

Automatic adjustment to 50 Hz and 60 Hz mains frequency

BA 9040

Measuring range: 3 AC 400 V

Monitoring:

asymmetry

phase failure

optionally with phase sequence recognition

Optionally with adjustable response delay

MK 9040N

Measuring range: 3 AC 400 V

Monitoring:

asymmetry

phase failure

optionally with phase sequence recognition

Optionally with adjustable response delay

IL 9059

Measuring range: 3 AC 380-690 V

Detection of incorrect phase sequence

MK 9056N

Measuring range: 3 AC 380-500 V

Detection of wrong phase sequence

IK 9179

Measuring range: 3 AC 400 V

Detection of phase sequence

IK 9169

Measuring range: 3/N AC 400; 230 V

Detection of phase failure

RN 9877

Measuring range: 3 AC 175 … 525 V / 100 … 300 V

Multiple additional functions

Adjustable hysteresis for reset

Adjustable switching delay

BD 9080

Measuring range: max. 3 AC 750 V

Multiple additional functions

Adjustable time delay 0.1 … 5 s

Mains monitoring

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