Measuring and monitoring relays DOLD

• According to IEC/EN 60 255-1
• For DC monitoring
• Detection of
- Overvoltage
- Untervoltage
- Voltage range excess in single-phase AC voltage systems
• No separate auxiliary necessary
• Output: 1 changeover contact
• De-energized on trip
• Adjustable switching voltage
• Adjustable hysteresis for reset
• Adjustable switching delay
• Fast fault detection
• Width: 35 mm

• According to IEC/EN 60 255-1
• For DC monitoring
• Detection of
- Overvoltage
- Untervoltage
- Voltage range excess in single-phase AC voltage systems
• No separate auxiliary necessary
• Output: 1 changeover contact
• De-energized on trip
• Adjustable switching voltage
• Adjustable hysteresis for reset
• Adjustable switching delay
• Fast fault detection
• Width: 35 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• Effective power measuring
• For single and 3-phases
• Adjustable response value 2 ... 20 % reverse power
• Hysteresis 12.5 %
• Rated current BH 9140: 5 A or 40 A
Rated current RP 9140: 5 A
• Adjustable on delay
• Open circuit operation
• LED indication for voltage supply and contact position
• 2 changeover contacts
• As option closed circuit operation
• Width:
BH 9140: 45 mm
RP 9140: 70 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• Effective power measuring
• For single and 3-phases
• Adjustable response value 2 ... 20 % reverse power
• Hysteresis 12.5 %
• Rated current BH 9140: 5 A or 40 A
Rated current RP 9140: 5 A
• Adjustable on delay
• Open circuit operation
• LED indication for voltage supply and contact position
• 2 changeover contacts
• As option closed circuit operation
• Width:
BH 9140: 45 mm
RP 9140: 70 mm

• According to EN 60 255-1
• Detection of underload (cos ϕ)
• Without auxiliary supply
• Current up to 8 A
Motors up to 5 A nominal current can be connected directly
• Higher currents via current transformer
• SL 9065CT with integrated current transformer for currents up to 100 A
• Adjustable response value
• Automatic reset (Alarm auto reset)
• Adjustable operate delay up to 100 s
• De-energized on trip
• For single and 3-phase loads e.g. motors
• Independent of phase sequence
• 1 changeover contact
• LED indicator voltage supply and alarm
• Devices available in 2 enclosure versions: IK 9065: depth 58 mm,
with terminals at the bottom for installation systems and industrial
distribution systems according to DIN 43 880
SK 9065, SL 9065CT: depth 98 mm, with terminals at the top for
cabinets with mounting plate and cable duct
• IK 9065, SK 9065 width 17.5 mm
SL 9065CT width 35 mm
IK/SK 9065/100: as IK/SK 9065 but:
• programmable for
- automatic reset or manual reset (latched alarm)
- energized or de-energized on trip
• with reset button
• remote reset

• According to EN 60 255-1
• Detection of underload (cos ϕ)
• Without auxiliary supply
• Current up to 8 A
Motors up to 5 A nominal current can be connected directly
• Higher currents via current transformer
• SL 9065CT with integrated current transformer for currents up to 100 A
• Adjustable response value
• Automatic reset (Alarm auto reset)
• Adjustable operate delay up to 100 s
• De-energized on trip
• For single and 3-phase loads e.g. motors
• Independent of phase sequence
• 1 changeover contact
• LED indicator voltage supply and alarm
• Devices available in 2 enclosure versions: IK 9065: depth 58 mm,
with terminals at the bottom for installation systems and industrial
distribution systems according to DIN 43 880
SK 9065, SL 9065CT: depth 98 mm, with terminals at the top for
cabinets with mounting plate and cable duct
• IK 9065, SK 9065 width 17.5 mm
SL 9065CT width 35 mm
IK/SK 9065/100: as IK/SK 9065 but:
• programmable for
- automatic reset or manual reset (latched alarm)
- energized or de-energized on trip
• with reset button
• remote reset

• According to EN 60 255-1
• Detection of underload (cos ϕ)
• Without auxiliary supply
• Current up to 8 A
Motors up to 5 A nominal current can be connected directly
• Higher currents via current transformer
• SL 9065CT with integrated current transformer for currents up to 100 A
• Adjustable response value
• Automatic reset (Alarm auto reset)
• Adjustable operate delay up to 100 s
• De-energized on trip
• For single and 3-phase loads e.g. motors
• Independent of phase sequence
• 1 changeover contact
• LED indicator voltage supply and alarm
• Devices available in 2 enclosure versions: IK 9065: depth 58 mm,
with terminals at the bottom for installation systems and industrial
distribution systems according to DIN 43 880
SK 9065, SL 9065CT: depth 98 mm, with terminals at the top for
cabinets with mounting plate and cable duct
• IK 9065, SK 9065 width 17.5 mm
SL 9065CT width 35 mm
IK/SK 9065/100: as IK/SK 9065 but:
• programmable for
- automatic reset or manual reset (latched alarm)
- energized or de-energized on trip
• with reset button
• remote reset

• According to IEC/EN 60 255, DIN VDE 0435-303
• Detection of underload (cos ϕ)
• Current ranges up to 10 A
• Adjustable response value
• Programmable functions:
- automatic or manual reset
- closed or open circuit operation
• Manual remote reset
• Adjustable operate delay up to 100 s
• For single and 3-phase AC-systems without neutral
• Independent of phase sequence
• Also for 400 Hz systems
• MK 9065.11 can be used for motors with frequency converters
2 ... 200 Hz)
• Optionally with sealable cover
• Green indicator LED for operational mode
• Red indicator LED for underload monitoring
• Width 22.5 mm

• According to IEC/EN 60 255, VDE 0435
• Detection of underload (cos ϕ)
• Current ranges up to 10 A, for higher values a CT must be used
• Adjustable response value
• Programmable functions:
- alarm when I = 0
- automatic or manual reset
- closed or open circuit operation
• Manual remote reset
• Adjustable operate delay
• Independent of phase sequence
• Also for 400 Hz systems
• Optionally for motors with frequency converters (10 ... 100 Hz)
(see notes)
• Width 45 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• As load depending output signals are available
- 0 ... 20 mA and 0 ... 10 V or
- 4 ... 20 mA and 2 ... 10 V
• Measures effective load
• Adjustment of P1 and P2 on absolute scale
• For motors up to 22 kW / 400 V bzw. 37 kW / 690 V
• Adjustable start up delay ta
• Up to 40 A without external current transformer
• As option for single phase loads
• LED indicators
• Width 45 mm

• According to IEC/EN 60255-1, IEC/EN 60255-26, DIN/VDE 0435-303
• Identification of
- Underload P1 and Overload P2
- Overload P1 (prewarning) and Overload P2
programmable
• Adjustment of P1 and P2 on absolute scale
• For motors up to 22 kW / 400 V; 37 kW / 600 V
• Measurement: effective power
• Large current range because of automatic range selection
• 1 changeover contact for P1 and 1 changeover contact for P2
• Adjustable start-up delay ta
• Adjustable switching delay tv
• With automatic or manual reset, programmable
• Test / Reset button for easy setup
• Up to 40 A without external current transformer
• De-energized or energized on fault, programmable
• Also for single-phase operation
• LED indicators
• Width 45 mm

• According to EN 60255-1
• Active power measuring
• Relay output
MK 9397N: 1 changeover contact
MH 9397: 1 changeover contact each for overload and prewarning
• On delay
• Closed circuit operation
• As option open circuit operation
• As option with plugable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• MK 9397N: Width 22,5 mm
MH 9397: Width 45 mm

• According to EN 60255-1
• Active power measuring
• Relay output
MK 9397N: 1 changeover contact
MH 9397: 1 changeover contact each for overload and prewarning
• On delay
• Closed circuit operation
• As option open circuit operation
• As option with plugable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• MK 9397N: Width 22,5 mm
MH 9397: Width 45 mm

• 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