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• 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 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