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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

• With forcibly guided contacts according to IEC 61810-3
• Max. 6 contacts
• As option goldplated contacts to switch low loads
• 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

• 3-phsase noise filter for measuring relays
• Noise suppression of wire bound interference
• Broadband suppression of high frequencies
• For nominal voltages up to 3 AC 1000 V
• PE connection for increased suppression level
• 2 models available:
MK 5130N: depth 97 mm
LG 5130: depth 121 mm
• Width: 22.5 mm

• According to IEC/EN 61 557-8
• For single and 3-phase AC-systems up to 0 ... 500 V and 10 ... 1000 Hz
• Monitors also disconnected voltage systems
• Adjustable tripping value RALof 5 ... 100 kΩ
• De-energized on trip
• Auxiliary voltage, measuring circuit and output contacts are galvanically separated
• Manual and auto reset
• With test and reset button
• Connections for external test and reset buttons possible
• LED indicators for operation and alarm
• 2 changeover contacts
• MK 5880N/200 with additional prewarning
- adjustable prewarning value 10 kΩ ... 5 MΩ
- 1 output relay for alarm and 1 for pre-warning
• MH 5880/500: similar to MK 5880N but with galvanic separated analogue output and 11 step LED chain for the actual insulation value
• 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
• MK 5880N: 22.5 mm width
MH 5880: 45 mm width

• According to IEC/EN 61 812-1
• Digital adjustable multifunction timer
• Functions can be adjusted separately for each output relay
- Off (OFF)
- Instantaneous contact (ON)
- On-delay (AV)
- Fleeting on make (EW)
- Delayed pulse with adjustable pulse length (IE)
- Cyclic timer, start with impulse (TI)
- Cyclic timer, start with break (TP)
- Off-delay (RV)
- Pulse forming function (IF)
- Fleeting on break (AW)
- Fleeting on make and break (EW / AW)
- On and off delay (AV / RV)
- Relay 1 = Relay 2, both switch simultaneously
• Dual voltage model AC 230 V + AC/DC 24 V
• 2 changeover contacts
• 2 times separately adjustable from 0.02s to 9999h
• LED-indicator
• 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 IEC/EN 61 812-1
• 8 functions settable via rotational switch:
- Delay on energisation (AV)
- Fleeting on make (EW)
- Delayed pulse (IE)
- Flasher, start with pulse (BI)
- Delay on de-energisation (RV)
- Pulse forming function (IF)
- Fleeting on break (AW)
- Delay on energisation and de-energisation (AV / RV)
• 8 time ranges from 0.02 s to 300 h selectable via rotational switches
• Voltage range AC/DC 12 ... 240 V
• With time interruption / time adding input for all functions
• 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 with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• 22.5 mm width
MK 7850N/500: as MK 7850N/200 but with
• 2 additional functions:
- Cyclic timer, start with break (TP)
- Fleeting on make and break (EW / AW)
• second time setting t2 for functions
- Cyclic timer, start with pulse (TI) or break (TP), based on the
separate setting of pulse and break time the flasher function
can be used as cyclic timer
- Fleeting on make and break (EW/AW)
- Delay on energisation and de-energisation (AV / RV)
- Delay pulse (IE) and setting of pulse length
• Connection facility for 2 external potentiometers

• According to IEC/EN 61 812-1
• 8 functions settable via rotational switch:
- Delay on energisation (AV)
- Fleeting on make (EW)
- Delayed pulse (IE)
- Flasher, start with pulse (BI)
- Delay on de-energisation (RV)
- Pulse forming function (IF)
- Fleeting on break (AW)
- Delay on energisation and de-energisation (AV / RV)
• 8 time ranges from 0.02 s to 300 h selectable via rotational switches
• Voltage range AC/DC 12 ... 240 V
• With time interruption / time adding input for all functions
• 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 with pluggable terminal blocks for easy exchange
of devices
- with screw terminals
- or with cage clamp terminals
• 22.5 mm width
MK 7850N/500: as MK 7850N/200 but with
• 2 additional functions:
- Cyclic timer, start with break (TP)
- Fleeting on make and break (EW / AW)
• second time setting t2 for functions
- Cyclic timer, start with pulse (TI) or break (TP), based on the
separate setting of pulse and break time the flasher function
can be used as cyclic timer
- Fleeting on make and break (EW/AW)
- Delay on energisation and de-energisation (AV / RV)
- Delay pulse (IE) and setting of pulse length
• Connection facility for 2 external potentiometers

• According to IEC/EN 61 812-1
• Adjustable flashing frequency, impulse time up to 300 s
• Repeat accuracy < ± 0.5 %
• Adjustable on absolute scale
• Start with impulse
• Available start with space
• dual-voltage version
• LED indication for operation and contact position
• 2 changeover contacts
• Width 22.5 mm

• According to IEC/EN 61 812-1
• Time delay up to 100 s
• Repeat accuracy < ± 0.5 %
• 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 IEC/EN 61 812-1
• 8 time ranges from 0.05 s to 300 h selectable via rotational switches
• Impulse and break time separately adjustable
• Selectable start with impulse or break
• Voltage range AC/DC 12 ... 240 V
• Adjustment aid for quick setting of long time values
• Suitable for 2-wire proximity sensor control
• LED indicators for operation, contact position and time delay
• 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
• As option 1 changeover contact instantaneously programmable
• As option connection of 2 remote potentiometers
• 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
• Converts pulses to selectable length
• No repeat control during the time period (of the pulse)
• Pulse lengthening / shortening
• Time range up to 60 min
• Repeat accuracy ≤ ± 1 %
• Setting on aboslute scale
• 2-voltage version
• LED displays for availability and contact position
• Available with 1 or 2 changeover contacts
• Width 22.5 mm

• According to IEC/EN 61 812-1
• Delay of 0.25 ... 640 s or min.
• 4 switchable time ranges
• Repeat accuracy ≤ ± 0.5 %
• Can be controlled with 2-wire initiators at terminals A1-A2,
residual current ≤ 5 mA
• Available as 2-voltage version
• Available with instantaneous contact
• 2 changeover contacts
• 2 LED displays for power supply and contact position
• Width 22.5 mm

• According to IEC/EN 61 812-1
• Delay up to 300 s
• Repeat accuracy ≤ ± 0.5 %
• Without auxiliary voltage
• No recovery time
• With large voltage range AC/DC 24 ... 240 V
• LED display for power supply
• 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
• With pluggable terminal blocks for easy exchange of devices
- with screw terminals
- or with cage clamp terminals
• Width 22.5 mm

• According to IEC/EN 61 810-1
• As option to switch low loads
• As option for 2-wire proximity sensor control
• Output: 4 changeover contacts
• With LED indicator
• 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 IEC/EN 61 810-1
• Setting input A1 - A2
• Reset input A3 - A2
• Storage function
• Switch position indication
• Manual operation
• Width 22.5 mm

• According to EN 60947-5-1, EN 60947-8, EN 60079-14, EN 61508, EN 50495, EN 13849
• Detection of
- overtemperature
- broken wire in sensor circuit
- short circuit in sensor circuit
• 1 input for 1 to 6 PTC-reistors
• Functions as options or settable with DIP-switches:
- automatic reset (fault is not stored)
- manual reset (fault is stored)
- manual reset only on start-up
- manual reset on and also after start-up
• No voltage safe manual reset
• Closed circuit operation
• LED indicators for
- auxiliary supply
- contact position
- overtemperature, broken wire or short-circuit in sensor circuit
• 2 changeover contacts
• Button for reset function
• Remote reset via terminals X1 / X2 (NO contact)
• Optionally safe separation according to EN 61 140, EN 60 947-1, 6 kV/2
between:
- auxiliary voltage and measuring circuit
- auxiliary voltage and output contacts
- measuring circuit and output contacts
- the 2 changeover contacts (only with 2 changeover contacts)
• Width 22.5 mm

• According to IEC 255, EN 60 255, VDE 0435 part 303
• Recognition of
- voltage asymmetry
- phase failure
- voltage feedback
- optionally with phase sequence recognition
• Optionally with adjustable response delay
• 2 LED displays for power supply and state of contact
• 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
• BA 9040: width 45 mm
MK 9040N: width 22.5 mm