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MK 9163N

Thermistor Motor Protection Relay

MK 9163N


Nominal voltage

Terminal type

Approvals and Markings


  • 0054096
  • MK9163N.12/61 AC50/60HZ 230V
The thermistor motor protection relay MK 9163N is used to To protect against thermal overload of... more

Product description

The thermistor motor protection relay MK 9163N is used to To protect against thermal overload of motors caused by high switching frequency, havy duty starting, phase failure on one phase, bad cooling, high ambient temperature. Also the temperature monitoring of bearings, transmissions, oil and cooling liquids is possible. Up to six thermistors can be connected via the input.

Technical specifications

Width: 22,5 mm
Measuring range max.: > 3.8 kΩ
Auxiliary voltage: AC, AC/DC
Classification: Thermistor-Motorschutz
Output contacts: 2 C/O contacts
Enclosure design: Switch cabinet
Type: MK 9163N


  • Reliable temperature monitoring of motors
  • Rapid fault location


  • 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