Monitoring devices DOLD

• According to IEC / EN 60 255, VDE 0435 Teil 303
• Monitoring of 50 - and 60 Hz-current supply on
over- and underfrequency
• 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 overand
underfrequency (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
- Time delay for over and underfrequency each adjustable
from 0 to 20 s
- As option one common output for under and overfrequency
“Window”-mode (MK 9143N/400 / MH 9143/400)
• MH 9143.38/008: with galvanic separated analogue output (current/
voltage) and 11 step LED chain for the actual frequency
• MK 9143N/600 / MH 9143/600:
- Variable alarm value in the range of 45 to 65 Hz
- Hysteresis adjustable for under- and overfrequency separately
adjustable 0 …20%
- Common output for under and overfrequency “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
overfrequency
• Output relay de-energized on trip for underfrequency
• Universal frequency measuring input for AC 40 … 550V
• Several options for auxiliary supply
• As option without aux. supply for voltage range AC 18 … 70 V or
70 … 275V
• LED indicators for auxiliary supply, input frequency, over and
under frequency alarm
• 2 possible contact arrangements
MK 9143N and MK 9143N/600: 2 x 1 C/O contacts, width 22,5 mm
MH 9143 and MH 9143/600: 2 x 2 C/O contacts, width 45 mm

• According to IEC / EN 60 255, VDE 0435 Teil 303
• Monitoring of AC voltage for under and overfrequency,
can be used also for pre-warning
• Separate relay outputs for over- or underfrequency
(1 or 2 changeover contacts each)
• Alternative usage for monitoring of a frequency window
• Separate adjustment of response value for over- or underfrequency
at 4 ranges each, 1.5 ... 200 Hz or 5 ... 600 Hz
• Second response value for prewarning possible
• Fast reaction time by measuring duration of cycle of input frequency
• Universal measuring input for AC-voltages of 15 ... 280 V
as well as 30 ... 550 V
• As option with measuring input for inverters
• Programmable hysteresis of response value: 2 ... 10 %
• Start up time delay programmable via terminals from
0 ... 50 s e.g. continuously
• Manual or auto-reset programmable via terminals
• Galvanic separation between measuring input, auxiliary voltage
and output contacts
• MH 9837/508: with galvanic separated analogue output (current/
voltage) and 11 step LED chain for the actual frequency
• MH 9837/5_0: with wide input range for auxiliary voltage available
(AC/DC 24 ... 60 V or AC/DC 110 ... 230 V)
• Closed circuit operation (de-energized on trip)
• LED indication for auxiliary voltage, measuring voltage and
alarm status
• Device available with 2 contacts
MK 9837N/5_0: 2 x 1 changeover contact
MH 9837/5_0: 2 x 2 changeover contacts or
wide auxiliary voltage range
• 2 possible compact designs:
MK 9837N/5_0: Width 22,5 mm
MH 9837/5_0: Width 45 mm

• Conformes à IEC / EN 60 255, DIN VDE 0435-303
• Surveillance en sous et surfréquence de réseaux 50/60Hz
• Surveillance de groupes et générateurs électriques
• Mesure de fréquence précise et rapide
• Entrée de mesure fortement protégée
• 2 seuils d’alarme séparés pour sous et surfréquence avec des
sorties relais séparées. (1 ou 2 inverseurs pour chaque relais)
• MK 9143N / MH 9143:
- Seuils d’alarme réglables précisément au travers d’un
commutateur 10 positions pour des plages de + 0,1 à + 5 Hz
de la fréquence de référence
- Fréquance de référence commutable de 50 à 60 Hz
- Hysterese fixe adaptée au seuil de réglage
- Temporisations d’alarme pour la sous et la surfréquence
réglables séparément de 0-20s.
- Sur demande, avec relais de sortie rágissant en mode“
Windows“ (à l’intérieur d’une fenêtre de fréquence)
(MK 9143N/400 / MH 9143/400)
• MH 9143.38/008: avec sortie analogique séparée galvaniquement
ainsi qu'une barre de visualisation à 11 LED pour l'indication de la
valeur actuelle de l'isolement
• MK 9143N/600 / MH 9143/600:
- Seuil d’alarme réglable dans une plage de 45-65Hz
- Hystérèse réglable séparément pour le seuil de sous et
surfréquence de 0,5-20%
- Mode de fonctionnement Window du relais de sortie
programmable (fenêtre de fréquence)
• Temporisation de démarrage configurable sur bornier dans la
plage de 0-30s
• Fonction Mémorisation ou hystérése de l’alarme configurable sur bornier
• Relais de sortie pour la surtension réglable en fonction de repos ou
de travail
• Relais de sortie pour la sous-tension en fonction de repos
(retombe en cas de sous-fréquence)
• Entrée de mesure de fréquence universel pour tensions de 40-550V
• Livrable pour diverses tensions d’alimentations
• Sur demande sans alimentation auxiliaire pour une plage de tension
de AC 18-70 ou 70-275V
• DEL de visualisation pour l’alimentation, la présence de signal
d’entrée, la sous et la surfréquence
• MH 9143.38/008: sortie analogique et une barre de visualisation pour
l'indication de la valeur actuelle de l'isolement
• 2 versions au choix:
MK 9143N et MK 9143N/600: 2 x 1 INV, Largeur utile 22,5 mm
MH 9143 et MH 9143/600: 2 x 2 INV, Largeur utile 45 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• 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
• No malfunction on
- asymmetrical mains
- mains with harmonic waves
- motors producing feedback
• Shorter response time than with motor circuit-breakers
• Green LED for intact fuses
• Red LED for fuse failure
• As option: open/closed circuit operation in the case
of IP 9075 programmable via X4-X5 or X3-X4
• As option: with manual reset function and remote reset,
programmable via X1-X2
• As option: 1 NO contact or 2 changeover contacts
• Devices available in 2 enclosure versions:
I-model: depth 59 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
S-model: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• IL 9075, SL 9075: width 35 mm
IP 9075, SP 9075: width 70 mm

• According to IEC / EN 60 255, VDE 0435 Teil 303
• Monitoring of AC voltage for under and overfrequency,
can be used also for pre-warning
• Separate relay outputs for over- or underfrequency
(1 or 2 changeover contacts each)
• Alternative usage for monitoring of a frequency window
• Separate adjustment of response value for over- or underfrequency
at 4 ranges each, 1.5 ... 200 Hz or 5 ... 600 Hz
• Second response value for prewarning possible
• Fast reaction time by measuring duration of cycle of input frequency
• Universal measuring input for AC-voltages of 15 ... 280 V
as well as 30 ... 550 V
• As option with measuring input for inverters
• Programmable hysteresis of response value: 2 ... 10 %
• Start up time delay programmable via terminals from
0 ... 50 s e.g. continuously
• Manual or auto-reset programmable via terminals
• Galvanic separation between measuring input, auxiliary voltage
and output contacts
• MH 9837/508: with galvanic separated analogue output (current/
voltage) and 11 step LED chain for the actual frequency
• MH 9837/5_0: with wide input range for auxiliary voltage available
(AC/DC 24 ... 60 V or AC/DC 110 ... 230 V)
• Closed circuit operation (de-energized on trip)
• LED indication for auxiliary voltage, measuring voltage and
alarm status
• Device available with 2 contacts
MK 9837N/5_0: 2 x 1 changeover contact
MH 9837/5_0: 2 x 2 changeover contacts or
wide auxiliary voltage range
• 2 possible compact designs:
MK 9837N/5_0: Width 22,5 mm
MH 9837/5_0: Width 45 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• 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
• No malfunction on
- asymmetrical mains
- mains with harmonic waves
- motors producing feedback
• Shorter response time than with motor circuit-breakers
• Green LED for intact fuses
• Red LED for fuse failure
• As option: open/closed circuit operation in the case
of IP 9075 programmable via X4-X5 or X3-X4
• As option: with manual reset function and remote reset,
programmable via X1-X2
• As option: 1 NO contact or 2 changeover contacts
• Devices available in 2 enclosure versions:
I-model: depth 59 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
S-model: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• IL 9075, SL 9075: width 35 mm
IP 9075, SP 9075: width 70 mm

• According IEC/EN 60255, DIN VDE 0435-303
• Detection of under- or overfrequency
• Adjustable response value
• Optionally 1 or 2 changeover contacts
• Width 45 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• 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
• No malfunction on
- asymmetrical mains
- mains with harmonic waves
- motors producing feedback
• Shorter response time than with motor circuit-breakers
• Green LED for intact fuses
• Red LED for fuse failure
• As option: open/closed circuit operation in the case
of IP 9075 programmable via X4-X5 or X3-X4
• As option: with manual reset function and remote reset,
programmable via X1-X2
• As option: 1 NO contact or 2 changeover contacts
• Devices available in 2 enclosure versions:
I-model: depth 59 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
S-model: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• IL 9075, SL 9075: width 35 mm
IP 9075, SP 9075: width 70 mm

• According to IEC / EN 60 255, VDE 0435 part 303
• Detection of over- or underfrequency of alternating voltage
(adjustable function)
• Fast reaction time by measuring duration of cycle of input frequency
• Universal measuring input for AC-voltages of 15 ... 280 V
as well as 30 ... 550 V
• As option with measuring input for inverters
• 4 ranges adjustable response value 1,5 ... 200 Hz or 5 ... 600 Hz
• Adjustable hysteresis
• Adjustable start up time delay 0 ... 50 s at function underfrequency
• Adjustable monitoring time for missing input signal at function
overfrequency
• Response delay programmable via terminals 0 ... 100 s
• Alarm storing or auto-reset programmable via terminals
• Galvanic separation between measuring input, auxiliary voltage
and output contacts
• MH 9837 available with wide input range for auxiliary supply
(AC/DC 24 ... 60 V or AC/DC 110 ... 230 V)
• 2 changeover contacts, closed circuit operation
• Open circuit operation on request
• LED indication for auxiliary voltage, measuring voltage and
alarm status
• MH 9837.12/008: with galvanic separated analogue output (current/
voltage) and 11 step LED chain for the actual frequency
• Device available with 2 response values and seperately controlled
outputrelays for under- and overfrequency see MK 9837N/500
• 2 possible compact designs:
MK 9837N: Width 22,5 mm
MH 9837: Width 45 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• To monitor fuses in single and 3-phase AC voltage systems
• Undervoltage 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
• Width 22.5 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• 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
• No malfunction on
- asymmetrical mains
- mains with harmonic waves
- motors producing feedback
• Shorter response time than with motor circuit-breakers
• Green LED for intact fuses
• Red LED for fuse failure
• As option: open/closed circuit operation in the case
of IP 9075 programmable via X4-X5 or X3-X4
• As option: with manual reset function and remote reset,
programmable via X1-X2
• As option: 1 NO contact or 2 changeover contacts
• Devices available in 2 enclosure versions:
I-model: depth 59 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
S-model: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• IL 9075, SL 9075: width 35 mm
IP 9075, SP 9075: width 70 mm

• According IEC/EN 60255, DIN VDE 0435-303
• Detection of under- or overfrequency
• Adjustable response value
• Optionally 1 or 2 changeover contacts
• Width 45 mm

• According to IEC / EN 60 255, VDE 0435 part 303
• Detection of over- or underfrequency of alternating voltage
(adjustable function)
• Fast reaction time by measuring duration of cycle of input frequency
• Universal measuring input for AC-voltages of 15 ... 280 V
as well as 30 ... 550 V
• As option with measuring input for inverters
• 4 ranges adjustable response value 1,5 ... 200 Hz or 5 ... 600 Hz
• Adjustable hysteresis
• Adjustable start up time delay 0 ... 50 s at function underfrequency
• Adjustable monitoring time for missing input signal at function
overfrequency
• Response delay programmable via terminals 0 ... 100 s
• Alarm storing or auto-reset programmable via terminals
• Galvanic separation between measuring input, auxiliary voltage
and output contacts
• MH 9837 available with wide input range for auxiliary supply
(AC/DC 24 ... 60 V or AC/DC 110 ... 230 V)
• 2 changeover contacts, closed circuit operation
• Open circuit operation on request
• LED indication for auxiliary voltage, measuring voltage and
alarm status
• MH 9837.12/008: with galvanic separated analogue output (current/
voltage) and 11 step LED chain for the actual frequency
• Device available with 2 response values and seperately controlled
outputrelays for under- and overfrequency see MK 9837N/500
• 2 possible compact designs:
MK 9837N: Width 22,5 mm
MH 9837: Width 45 mm

• According to IEC/EN 60 255-1
• Detection of
-- missing neutral in the system
-- broken neutral on IL/SL 9069
-- neutral exchanged against phase
• Detection of phase failure also with disconnected load
• For 3-phase systems
• De-energized on trip
• LED indicator for operation/state of output contacts
• Single phase connection possible
• Without auxiliary voltage
• 2 cangeover contacts
• Optionally with adjustable asymmetry detection and on delay
• Devices available in 2 enclosure version:
IL 9069: depth 59 mm with terminals at the bottom for
installations systems and industrial distribution
systems according to DIN 43 880
SL 9069: depth 98 mm with terminals at the top for
cabinets with mounting plate and cable duct
• Width 35 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• Monitoring of overfrequency and underfrequency (selectable)
in A.C. power systems
• Without auxiliary voltage
• Selection of frequency range for 50 or 60 Hz systems
• Adjustable response value
• Adjustable hysteresis
• De-energized on trip (output relay not activated in case of error)
• LED indicators for measuring voltage and contact position
• 1 changeover contact
• As option energized on trip (output relay activated in case of error)
• Devices available in 2 enclosure versions:
IK 9143: depth 58 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
SK 9143: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• 17.5 mm width

• According to IEC/EN 60 255-1
• Detection of
-- missing neutral in the system
-- broken neutral on IL/SL 9069
-- neutral exchanged against phase
• Detection of phase failure also with disconnected load
• For 3-phase systems
• De-energized on trip
• LED indicator for operation/state of output contacts
• Single phase connection possible
• Without auxiliary voltage
• 2 cangeover contacts
• Optionally with adjustable asymmetry detection and on delay
• Devices available in 2 enclosure version:
IL 9069: depth 59 mm with terminals at the bottom for
installations systems and industrial distribution
systems according to DIN 43 880
SL 9069: depth 98 mm with terminals at the top for
cabinets with mounting plate and cable duct
• Width 35 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• Overfrequency or underfrequency monitoring of AC voltages
• Adjustable response value fmin. or fmax 5 ... 200 Hz or 15 ... 600 Hz
• Adjustable hysteresis
• Large voltage range of the measuring input (nominal voltage
AC 24 ... 440 V)
• De-energized on trip
• LED indication for auxiliary voltage, measuring voltage and contact
position
• 1 changeover contact
• As option for frequency inverters with a range of 1 … 300 Hz
• 2 changeover contacts available on request
• As option adjustable start-up delay available
• Energized on trip function available on request
• Devices available in 2 enclosure versions:
IL 9837: depth 58 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
SL 9837: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• 35 mm width

• According to IEC/EN 60 255, DIN VDE 0435-303
• Monitoring of overfrequency and underfrequency (selectable)
in A.C. power systems
• Without auxiliary voltage
• Selection of frequency range for 50 or 60 Hz systems
• Adjustable response value
• Adjustable hysteresis
• De-energized on trip (output relay not activated in case of error)
• LED indicators for measuring voltage and contact position
• 1 changeover contact
• As option energized on trip (output relay activated in case of error)
• Devices available in 2 enclosure versions:
IK 9143: depth 58 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
SK 9143: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• 17.5 mm width

• According to IEC/EN 60 255, DIN VDE 0435-303
• Overfrequency or underfrequency monitoring of AC voltages
• Adjustable response value fmin. or fmax 5 ... 200 Hz or 15 ... 600 Hz
• Adjustable hysteresis
• Large voltage range of the measuring input (nominal voltage
AC 24 ... 440 V)
• De-energized on trip
• LED indication for auxiliary voltage, measuring voltage and contact
position
• 1 changeover contact
• As option for frequency inverters with a range of 1 … 300 Hz
• 2 changeover contacts available on request
• As option adjustable start-up delay available
• Energized on trip function available on request
• Devices available in 2 enclosure versions:
IL 9837: depth 58 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
SL 9837: depth 98 mm, with terminals at the top for cabinets
with mounting plate and cable duct
• 35 mm width

• According to DIN VDE 0660 part 302 (pr EN 60 947-8)
and part 303
• 1 input for PTC-resistors or bimetal contacts
• Broken wire detection in sensor circuit
• Optionally with no voltage reclosing interlock
• Closed circuit operation
• 1 or 2 changeover contacts
• Width 45 mm