Dold Industries Ltd

11 Hamberts Rd. Blackall Ind. Estate
South Woodham Ferrers
GB-Essex, CM3 5UW
IL 9837

Frequency Relay

IL 9837


Auxiliary voltage

Start up delay

Measuring range


Approvals and Markings


  • 0056555
  • IL9837.11 5-200HZ UH=AC230V
The frequency relay IL 9837, SL 9837 can be used to monitor the frequency of AC voltage systems,... more

Product description

The frequency relay IL 9837, SL 9837 can be used to monitor the frequency of AC voltage systems, rotor frequency of slip ring motors, control/monitoring of motors on cranes, monitoring the output frequency of inverters (IL9837.11/500).

Technical specifications

Measuring range max.: 300 Hz
Standard measuring range: 5 - 200 Hz
1- / 3-phase: 1
Operate delay: Yes
Output contacts: 1 C/O contact
Width: 35 mm
Enclosure design: Distribution board
Auxiliary voltage required: Yes
Type: IL 9837


  • According to IEC/EN 60255-1
  • 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 43880
    SL 9837: depth 98 mm, with terminals at the top for cabinets with mounting plate and cable duct
  • 35 mm width