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  PTC Thermistors
  Thermistor Protection Relay
  Resistance Temperature Detector (RTD)
  Single and Dual Element Stator Winding RTDs
  Thermal Overload Protector (TOP)
  Electric Motor Anti-Condensation Heater
  Thermowells
     
  PTC Thermistors


 
 

Complete Protection from burning of winding

 
 
Thermo System Thermistors are manufactured in accordance with DIN 44081 and 44082. In three phase motors, one Thermistor should be embedded in each phase. Good thermal coupling between Thermistor and winding is essential. The resistance increases sharply in the region of the nominal response temperature. Because the PTC assemblies are very small and rugged, they can be located in compact locations where protec­tion is needed, such as directly inside the motor wind­ings and can withstand standard varnish dip and bake operations and other handling. Response times ≤ 5 sec. are achieved with THERMO SYSTEM Thermistor.
 
 
 
  Features:  
 
Provides economical and reliable protection for 3-phase motors
Wide range available: 60°C to 190°C switching temperature
Available in compact size for easy assembly into windings
Rapid response protection for electrical machines
Long hysteresis free switch cycle life. Steep temperature-resistance curve characteristic allows for
  simple evaluation electronics.
 
     
  Resistance-temperature diagram and main characteristics in accrodance to DIN 44081/44082  
 

Thermo System motor protection sensors conform to DIN 44081 or 44082 and are characterised by very high temperature sensitivity. In the range of the nominal alternating temperature the resistance increases sharply. This change can be used by a relay to disconnect the load circuit. Electronic evaluation circuits in widely varying applications are also possible. The resistance temperature diagram shows the typical characteristics of the Thermo System PTC. Load must not be applied to the thermistors as this creates a self-heating effect.

At ambient temperature the resistance value of thermistors is normally between 30 and 250 Ω. At ambient temperature the resistance values have no relevance to the serviceability (functionality) at the ROT (rated operating temperature).The ROT of PTC-thermistors in the range of +60°C to +190°C progresses normally in steps of 10 K.
 
     
  Specification for Thermistors  
     
 

PTC Thermistor Technical Data

Single PTC

Triple PTC

Units

Max. Working Voltage

Vmax

25

25

Volts

Rated Temperature

Tk

60--190

60--190

Deg.c

Tolerance Temperature

Tk

±5

±5

Deg.c

Repeatability

T

±0.5

±0.5

Deg.c

Nominal Resistance @ 25 Deg.C.

R25

≤100

≤300

0hms

Trip Resistance below Nominal

Tκ - 5Deg.c

≤1650

≤550

0hms

Trip Resistance above Nominal

Tκ+ 5Deg.c

≥3990

≥1330

0hms

Trip Resistance will above Nominal

Tκ + 15Deg.c

≥12

≥4

Reaction Time

tD

<5

<5

Secs

Insulation

V

2.5

2.5

kv

Maximum Storage Temperature

TLmax

160

160

Deg.c

Minimum Storage Temperature

TLmin

-25

-25

Deg.c

Colour

See Table Below

Weight

Wt

2

3.5

g

 
     
    Colour Coding For Different Temperature Ratings  
 
 
 

Trip Temp

60

70

80

90

100

105

110

115

120

125

130

I st Colour

White

White

White

Green

Red

Blue

Brown

Blue

Grey

Red

Blue

IInd Colour

Grey

Brown

White

Green

Red

Grey

Brown

Green

Grey

Green

Blue

Trip Temp

135

140

145

150

155

160

165

170

180

190

1st Colour

Red

White

White

Black

Blue

Blue

Blue

White

White

Orange

Last Colour

Black

Blue

Black

Black

Black

Red

Brown

Green

Red 

Black

 
 
 
 
 
 
     
  Error and Measure  
     
 

Failure

Cause

Corrective Method

The resistor Value is too large.(When the load wire is measured with the multimeter, the single resistance value should be lower than 100 Ω at 25 Deg.C)

1. There is dead contact or poor contact of the thermistor lead wires.                                                2.The thermistor is damaged.

1. Inspectiot if there is dead contact or poor contact of the thermistor lead wire.                                               
 2. Replace the thermistor with new one.

It sometimes trip thermistor Relay and sometimes doesn't trip.

1. The thermistor leading wire is not  properly contacted at Thermistor Relay terminal.                            2.The thermistor is damaged.

1. Inspectiot if there is dead contact or poor contact of the thermistor lead wire/ Relay.                                                                        2. Replace the thermistor with new one.

 
     
     
     
 
Being a quality conscious company, we place quality as the nucleus of all our endeavors. Our quality inspectors carefully monitor the entire production process at every level of operation to check that our products conform to relevant quality.
 
 
 
Special attention is given on the procurement of the raw material. We conduct periodic inspections and conduct various tests to make our products flawless. Each and every piece is tested to ensure that it performs efficiently after the consignmen
 
     
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