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• According to IEC/EN 60 255-1
• For monitoring direct current voltage supply systems
to detect residual ripple
• For DC 48 V
• With adjustable residual ripple
• LED indication for operation and contact position
• Time delay 10 s
• 1 changeover contact
• Width: 22,5 mm

• According to IEC/EN 60 255-1, IEC/EN 60 947-1
• to: monitor DC and AC
• BA 9053 with measuring ranges from 2 mA to 25 A
• BA 9053 optionally with 3 measuring ranges 0.1 up to 25 A
• MK 9053N with measuring ranges from 2 mA up to 10 A
• High overload possible
• Input frequency up to 5 kHz
• Galvanic separation between auxiliary circuit - measuring ciruit
• Auxiliary supply AC/DC; BA 9053 with AC
• BA 9053 optionally with start-up delay (MK = standard)
• with time delay, up to max. 100 sec
• BA 9053 optionally with safe separation to IEC/EN 61140
• MK 9053N optionally with remote potentiometer
• As option with manual reset
• LED indicators for operation and contact position
• MK 9053N as option with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• Width BA 9053: 45 mm
Width MK 9053N: 22.5 mm

• According to IEC/EN 60 255, DIN VDE 0435-303, IEC/EN 60 947-1
• to: monitor DC and AC
• BA 9054 with measuring ranges from 15 mV to 1000 V
• MK 9054N with measuring ranges from 15 mV to 500 V
• High overload possible
• Input frequency up to 5 kHz
• Galvanic separation between Auxiliary Circuit – measuring ciruit
• Auxiliary supply AC/DC; BA 9054 with AC
• BA 9054 optionally with start-up delay (MK = standard)
• with time delay, up to max. 100 sec
• BA 9054 optionally with safe separation to IEC/EN 61140
• MK 9054N optionally with remote potentiometer
• As option with manual reset
• LED indicators for operation and contact position
• MK 9054N as option with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• Width BA 9054: 45 mm
Width MK 9054N: 22.5 mm

• According to IEC/EN 60 255-1, VDE 0435 part 303
• Detection of high or low-rpm / stand still (adjustable function)
• Large setting range 1 ... 120.000 IPM or
0.15 ... 20.000 Hz (10 ranges each)
• As option with input for NAMUR-sensors with sensor and
wire protection against interruption and short circuit
• Adjustable hysteresis 0.5 ... 50 %
• Adjustable start up time delay 0 ... 50 s, control with external contact
• Adjustable monitoring time for missing input signal at function
overfrequency; additional using as standstill level
• Programmable via termminals:
- Alarm delay of 0 ... 100 s
- with manual reset or auto reset
• LED-indication for auxiliary voltage, measuring input and output relay;
additional LED for indication of wire- / sensor failure at NAMUR-input
• Auxiliary voltages AC 230 V and DC 24 V in one unit
• 2 changeover contacts, closed circuit operation
• Open circuit operation on request
• As option with analogue output, proportionally to speed
• Device available with 2 response values and seperately controlled
output relays for under- and overfrequency see MK 9055N/5_ _
• MH 9055 with wide input range for auxiliary voltage
(AC/DC 24 ... 60 V or AC/DC 110 ... 230 V)
• 2 possible compact designs
MK 9055N: Width 22,5 mm
MH 9055: Width 45 mm

• According to IEC/EN 60 255, DIN VDE 0435-303
• Detection of wrong phase sequence
• 2 changeover contacts
• Wire connection: also 2 x 1.5 mm2 stranded ferruled, or
2 x 2.5 mm2 solid DIN 46 228-1/-2/-3/-4
• MK 9056N as option with pluggable terminal blocks for easy
exchange of devices
- with screw terminals
- or with cage clamp terminals
• Width 22.5 mm

• AC/DC voltage measuring (single-phase)
• Start up delay, on delay
• Manual reset
• LCD for indication of the measuring values
• Relay output
MK 9064N: 1 changeover contact
MH 9064: 2 x 1 changeover contacts
• Relay function selectable (energized/de-energized on trip)
• As option with plugable terminal blocks for easy exchange of devices
- with screw terminals
- or with cage clamp terminals
• With RS485 (on request)
• Width MK 9064N: 22.5 mm
• Width MH 9064: 45.0 mm

• 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

• 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
• 3 probe connections for 2-point and 1-point level control
• Also for use as moisture detector
• High interference resistance of the Measuring Circuit,
which is isolated from the mains
• Max. wire length to the probes: 1500 m
• Large setting range: 2 ... 450 kΩ
this permits differentiation between fluid and foam
• Separately adjustable response and release time delay
0.2 ... 20 s for MIN- and MAX-level
• Programmable for:
- 2 separate controllable output relays for MIN and MAX level
- common controlled output relays for 2-point hysteresis
level control
- open circuit operation
- closed circuit operation
• Measuring Circuit for probes works with internally generated
AC voltage (approx. 30 Hz), electrolytic behaviour does not
occur in the liquid
• For auxiliary voltages of 24 ... 415 V AC or 24 V DC
• LEDs for operation and state of contact
• 2 changeover relays with 1 changeover contact each
• IL 9151 and SL 9151 with safe separation according to
IEC/EN 61 140, IEC/EN 60 947-1
• Devices available in 3 enclosure versions:
IL 9151: depth 59 mm, with terminals at the bottom for
installation systems and industrial distribution
systems according to DIN 43 880
SL 9151,
MK 9151N: depth 98 mm, with terminals at the top for
cabinets with mounting plate and cable duct
• IL/SL 9151: 35 mm width
MK 9151N: 22.5 mm width

• According to EN 60947-5-1, EN 60947-8
• Monitioring of
- overtemperature
- broken wire detection in sensor circuit
- short circuit detection in sensor circuit
• 1 input for 1 to 6 PTC-resistors
• De-energized on trip
• LED-indicator for
- auxiliary supply
- state of contact
• Output with 2 changeover contacts
• As option with manual reset, internal reset button and external
remote reset X1/X2
• Wire connection: also 2 x 1.5 mm2 stranded ferruled, or
2 x 2.5 mm2 solid DIN 46 228-1/-2/-3/-4
• As option with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• Width 22.5 mm

• According to EN 60947-5-1, EN 60947-8, EN 60079-14, EN 61508, EN 50495, EN 13849
• Monitioring of
- overtemperature
- broken wire detection in sensor circuit
- short circuit detection in sensor circuit
• 1 input for 1 to 6 PTC-resistors
• De-energized on trip
• LED-indicator for
- auxiliary supply
- state of contact
• Output with 2 changeover contacts
• As option with manual reset, internal reset button and external
remote reset X1/X2
• Wire connection: also 2 x 1.5 mm2 stranded ferruled, or
2 x 2.5 mm2 solid DIN 46 228-1/-2/-3/-4
• As option with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• Width 22.5 mm

• Multifunction measuring relay acc. to EN 60255-1
• Voltage monitoring (1- and 3-phase)
• Current monitoring
• Frequency monitoring
• Power factor cos phi
• Phase sequence, phase failure, asymmetry
• Effective-, reactive- and apparent power
• Start up delay, on delay
• Adjustable hysteresis 0.2 ... 50 % of response value
• Manual reset
• LCD for indication of the measuring values
• Relay output
MK 9300N: 1 changeover contact
MH 9300: 2 x 1 changeover contacts
• Relay function selectable (energized/de-energized on trip)
• As option with plugable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• MK 9300N: Width 22,5 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 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, 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 61 812-1
• 8 time ranges from 0.05 s to 300 h selectable via rotational switches
• Voltage range AC/DC 12 ... 240 V
• Adjustment aid for quick setting of long time values
• Suitable for 2-wire proximity sensor control
• 2 changeover contacts, one programmable as instantaneous contact
• LED indicators for operation, contact position and time delay
• Wire connection: also 2 x 1.5 mm2 stranded ferruled, or
2 x 2.5 mm2 solid DIN 46 228-1/-2/-3/-4
• As option connection of a remote potentiometer
• As option with time interruption / time adding input
• As option with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• 22.5 mm width

• According to IEC/EN 61 812-1
• Delay up to 600 s
• Repeat accuracy < ± 1 %
• Without auxiliary voltage
• Available with instantaneous contact
• Safe resetting
• Remote potentiometer connection to terminal Z1 - Z2 possible
• 2-wire proximity sensor control
• Width 22.5 mm

• According to IEC/EN 61 812-1
• Time delay up to 100 h
• Repeat accuracy ≤ ± 1 %
• With auxiliary voltage (Nominal voltage UN)
• MK 9962 with dual voltage supply
• Control by voltage free contact
MK 9962 optionally control by supply voltage
• 2 LED displays for control and contact position
• 2 changeover contacts
• BA 7962, AA 9962: width 45 mm
MK 9962: width 22.5 mm

• According to IEC/EN 61 812-1
• 8 time ranges from 0.05 s to 300 h selectable via rotational switch
• With auxiliary supply
• Voltage range AC/DC 12 ... 240 V for auxiliary supply
and control input
• Adjustment aid for quick setting of long time values
• With input for interruption of timing
• LED indicators for operation, contact position and time delay
• 2 changeover contacts
• With remote potentiometer facility as option
• Wire connection: also 2 x 1.5 mm2 stranded ferruled, or
2 x 2.5 mm2 solid DIN 46 228-1/-2/-3/-4
• As option with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• 22.5 mm width