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Minilec Temperature Protection Relay PTC

Minilec Temperature Protection Relay PTC
Minilec Temperature Protection Relay PTC
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Product Code : PTC
Brand Name : Minilec
Product Description

Minilec Temperature Protection Relay


PTC Thermistors are semi conductor sensors. These have typical characteristics that change their resistance instantly at a specified pre-defined response temperature
(NRT). As soon as the surrounding temperature of PTC reaches its NRT value the body resistance of PTC Thermistor rises sharply from 200 / 250 Ohms to more than 5000 Ohms.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.



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 Information: :
Primary & Secondary Current.



Inner Diameter.
Outer Diameter.
Minilec Relay Model Name.


Wherever not specified Contact Rating : 5A @ 230 V AC (resistive)

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