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PTC thermistor / PTC motor protection sensor

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PTC (Positive Temperature Coefficient) motor protection sensors are temperature-sensitive resistors made of semiconductor ceramics. (Other names: thermistors, PTC thermistors.)

 

The reproducible change in resistance is used as a physical variable to activate tripping devices, for example. This provides a defined temperature control that serves as a protective function in electrical devices for a wide range of applications, e.g. for switching off the load current, switching on alarm devices, etc.

Art.-Nr.

The PTC motor protection sensors are designed with basic protective insulation as standard.

Thanks to their outstanding quality, our PTC motor protection sensors fulfil the highest safety and reliability requirements.

Small and flexible in use

  • Ideal for limited installation space
  • Ideally suited for direct installation in and on windings
  • An extensive range of stranded wires is available
  • Multi-ling interconnections with up to 6 sensors in series are possible

 

Safe

  • Manufactured according to DIN 44 081 (single sensor) and DIN 44 082 (triplet sensor) specifications

 

Reliable

  • Very high temperature sensitivity due to low mass
  • In the range of the nominal response temperature TREF, the resistance R rises extremely steeply

 

Extremely durable

  • No burn-off, no material fatigue, constant nominal response temperature (over years)

 

Supply voltage – DC voltage [V, VDC]

PTC motor protection sensors should ideally be operated with virtually no current. It is recommended to apply a voltage of approx. 2.5 V DC to 7.5 V DC, preferably pulsed. In this way, the power integral is minimised and the current flow through the PTC motor protection sensor is almost zero = > no or only very low self-heating!

A larger current flow can lead to self-heating of the sensor and thus to tripping even below the nominal response temperature TREF.

 

Multiple circuit:

In the case of multiple circuits, the total resistance is calculated from the sum of the individual resistances. The sensors are always connected in series!

Beispiel: Widerstand eines Drillings bei Raumtemperatur: 3 * ( < 250) = < 750 Ohm (Standard).

 

During installation, the PTC thermistor / PTC motor protection sensor

  • As close as possible to the heat source
  • be inserted parallel to the winding axis
  • In the case of multi-phase motors, it should be installed in each winding if possible

 

Application

  • In and on windings of electric motors, transformers or ballasts
  • As a temperature sensor in devices (e.g. in the household or automotive sector, in electronic assemblies
    on heat sinks or circuit boards)

 

Hint

The data and information provided are based on tests and test series. They are intended as a guide, which is why there may be deviations for individual applications and uses. The suitability for a specific application must be checked by the user in each individual case. We will of course be happy to advise you.

 

Types

SNM (bearing type)

with Mylar®-Nomex® insulation protective cap

 SKM

with Kynar® (PVDF) insulation protection sleeve

 STM

with Teflon® (PTFE) insulation protective sleeve

LTM (insulated housing)

with aluminium screw-on housing M4x5, max. Torque 2 Nm

 

Temperature-resistance characteristic

according to DIN 44081 (single), DIN 44082 Drilling)

General characteristics

General characteristics
TREF = Nominal response temperature

TREF = 90 ˚C to 160 ˚C in steps of 10K or 5K
Temperature T[°C] Resistance R according to DIN 44081 (per sensor) Measuring voltage [VDC]
– 20˚C Up to TREF – 20K 20 W to 250 W

– Standard –

 < 2,5 V
TREF – 5K

< 550 W

 < 2,5 V
TREF + 5K < 1330 W < 2,5 V
TREF + 15K > 4’000 W

< 7,5 V

pulsed
max. Permissible operating voltage: Umax = 30 V

max. recommended sensor voltage. Umess = 7.5 V Dielectric strength of the insulation: Ueff = 2.5 kV

R-T characteristic values for other TREFs (nominal response temperatures) – on request –

 

Nominal response temperatures and color coding of the cables

Connection lines (external)/connection lines (internal),

(values in italics do not correspond to DIN 44081/DIN 44082)

The connecting cables for multiple interconnections are yellow as standard. Cable colours can vary in shade! Other colour combinations on request.

Wiring

 

Single circuit SNM Single circuit SKM/STM Single circuit LTM
Twin connection Triplet connection Quadruplet connection Six-terminal connection

For missing earth see individual wiring, each available in SNM, SKM, STM version

 

Single PTC thermistor SNM Triple PTC thermistor SNM
Cable lengths 520 mm Cable lengths 520/185/185/520mm
Standard cross-section 0.25 mm2 Standard cross-section 0.25 mm2
Art. no. TREF °C Standard identification colours Art. no. TREF°C Standard identification colours
KLSNMES060 ♦ 60±5 white-grey KLSNMDS060 60±5 white-yellow-yellow-grey
KLSNMES090 ♦ 90±5 green-green KLSNMDS090 90±5 green-yellow-yellow-green
KLSNMES100 ♦ 100±5 red-red KLSNMDS100 100±5 red-yellow-yellow-red
KLSNMES105 105±5 blue-grey KLSNMDS105 105±5 blue-yellow-yellow-grey
KLSNMES110 ♦ 110±5 brown-brown KLSNMDS110 ♦ 110±5 brown-yellow-yellow-brown
KLSNMES115 115±5 blue-green KLSNMDS115 115±5 blue-yellow-yellow-green
KLSNMES120 ♦ 120±5 grey-grey KLSNMDS120 ♦ 120±5 grey-yellow-yellow-grey
KLSNMES125 125±5 red-green KLSNMDS125 125±5 red-yellow-yellow-green
KLSNMES130 ♦ 130±5 blue-blue KLSNMDS130 ♦ 130±5 blue-yellow-yellow-blue
KLSNMES135 135±5 red-brown KLSNMDS135 135±5 red-yellow-yellow-brown
KLSNMES140 ♦ 140±5 white-blue KLSNMDS140 ♦ 140±5 white-yellow-yellow-blue
KLSNMES145 145±5 white-black KLSNMDS145 145±5 white-yellow-yellow-black
KLSNMES150 ♦ 150±5 black-black KLSNMDS150 ♦ 150±5 black-yellow-yellow-black
KLSNMES155 ♦ 155±5 blue-black KLSNMDS155 ♦ 155±5 blue-yellow-yellow-black
KLSNMES160 ♦ 160±5 blue-red KLSNMDS160 160±5 blue-yellow-yellow-red
KLSNMES165 165±5 blue-brown KLSNMDS165 165±5 blue-yellow-yellow-brown
KLSNMES170 ♦ 170±5 white-green KLSNMDS170 ♦ 170±5 white-yellow-yellow-green
KLSNMES180 ♦ 180±5 white-red KLSNMDS180 ♦ 180±5 white-yellow-yellow-red
KLSNMES190 190±5 black-brown KLSNMDS190 190±5 black-yellow-yellow-brown

♦ Bearing types

 

Note:

Orders without details of cable lengths are carried out in accordance with DIN 44081 and DIN 44082 specifications.

  • External cables -> 520 mm
  • Internal cables -> 185 mm (e.g. triplets)

 

Examples:
KLSTM.120.DS

Triple connection: PTFE (Teflon®) cap Standard: Standard: TREF = 120°C

 

KLSKM.110.ZS.0300.0200.0400

Twin connection: Kynar® cap Standard: TREF = 110°C

L1 = 300 mm, L2 = 200mm L3 = 400 mm

 

 

 KLSKM.110.ZS.0300.0200.0400

Twin connection: Kynar® cap Standard: TREF = 110°C

L1 = 300 mm, L2 = 200mm L3 = 400 mm

 

KLLTM.090.ES.0400.0400

Individual connection: Aluminium screw-on housing Standard: TREF = 90°C

520 mm long external cables (L1+L4) – on both sides

185 mm long internal cables (L2+L3).

 

Customised versions

Version K (customised) – possible deviations on request

  • Colour coding
  • Cable insulation material or cable cross-section
  • Dielectric strength of the insulation
  • ( suitable e.g. for installation in protection class II applications )
  • Cable end assembly
  • Connection technology
  • Components used with UL listing

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