Protective Relays and Monitoring Relays from RS Components, Ltd.


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The MK9052 motor protection relay is used to prevent thermal overloads in motors (for example as caused by high switching frequencies, heavy start-up loads, single phase operation, interrupted cooling, high ambient temperature). Special thermistors (PTC resistors) developed specifically for motor protection are used as temperature sensors. Up to 6 sensors can be switched in sequence, when a fixed resistance level is reached, they cause the output relay of the MK9052 to de-energise.
1 input for thermistors or bi-metallic contacts. Wire breakage detection in the sensor circuit. LED for switching status. Rest current principle. 1 changeover. 22.5 mm overall width
Monitoring Application = Thermistor
Supply Voltage = 24 V dc
Contact Configuration = SPDT
Width = 22.5mm
Length = 90mm
Minimum Operating Temperature = -20°C
Maximum Operating Temperature = +60°C
Height = 81mm
Dimensions = 90 x 22.5 x 81 mm
Operating Temperature Range = -20 - +60 °C


Product Category
Protective Relays and Monitoring Relays
Operating Temp
-4 to 140 F (-20 to 60 C)
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