Voltage Monitoring Relays
Frequency Monitoring Relays
Power Monitoring Relays & CBCT
Level Controllers – Conductive Liquids
Level Controllers – Non Conductive Liquids
Process/Plant Control and Automation
Twin AC Controller

Motor / Pump Protection Relays

PTC

PTC-Motor-/-Pump-Protection-Relays-Minilec-group

PTC Thermistors are semiconductor sensors with the ability to change resistance instantly at a specified pre-defined response temperature (NRT).

The PTC Thermistors are embedded in the overhang location of the motor windings.

The NRT value of PTC is selected according to the Insulation Class of the copper windings of motor or transformers.

Technical Data

Selection Chart for NRT of PTC Thermistors.
NRT °C Class of Ins. Cable Colour Code
70 - White - Brown
80 - White - White
90 - Green - Green
100 A Red - Red
110 - Brown - Brown
120 E Grey - Grey
130 B Blue - Blue
140 - White - Blue
150 F Black - Black
160 - Blue - Red
170 H White - Green
180 C White - Red
190 - Orange - Black
Minilec offers CBCT for our Earth fault relay & Earth Leakage Relay.
  • Ordering InformationPrimary & Secondary Current
    Inner Diameter

    Outer Diameter
    Minilec Relay Model Name
    Note:
  • Wherever not specified Contact Rating : 5A @ 230 V AC (resistive)

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