PTC Thermistors
Temperature Sensors for Motor
Protection and Electronics
(temperature-sensitive resistors)
YD
YG
YD
YG
EF
YGM
YGM
TKA
TKA
1
1
3
3
1
1
3
1
2
FEATURES
– rapid response protection for electrical machines
– compact size for easy assembly into windings
– silvered copper leads
DESCRIPTION
PTC thermistors act as thermal protection for electrical machines, and
are well known particularly as motor-protectors. They are available with
or without insulating sleeve and have flexible connecting leads.
PTC thermistors have a non-linear resistance/temperature response,
and at a specified temperature the resistance changes rapidly to a very
high value.
DIMENSIONS
YD 1
Single thermistor
with shrunk-sleeve
YGM 1
Mini-version
with shrunk-sleeve
YD 3
Triplet version (in series)
YGM 3
Mini-version
EF 1
Sensor
Standard
mini
threaded
PTC-Thermistors
02-02-02
1000-Y-180
CANTHERM
8415 Mountain Sights Avenue • Montreal (Quebec), H4P 2B8, Canada
Tel: (514) 739-3274 • 1-800-561-7207 • Fax: (514) 739-290
E-mail : sales@cantherm.com • Website: www.cantherm.com
Cantherm
OPERATION
PTC thermistors exhibit very high sensitivity over a
narrow temperature band. For temperature measure-
ment in this range, NTC thermistors are easier to
measure and more accurate.
- PTC’s are classified according to their nominal
response temperature
NAT
but all have similar
resistance characteristics to simplify the choice
of switching device; the relationship of resistance
to temperature of all these PTC’s is as follows:
STANDARD RESISTANCE VALUES
PTC thermistors are especially suited as temperature
sensors for monitoring the windings of electric
machines, and also for use in simple fail-safe circuitry.
When a given temperature (nominal response tempe-
rature
NAT
) is exceeded, the circuit can be switched
off through a relay or amplifier, since the PTC-sensor
will have an extremely high ohmic value in the region
of its response temperature. This will have the same
effect as a break in the circuit or a failure of the
thermistor.
Single PTC
Temperature
°C
– 20 to
NAT
NAT
Resistance
measuring Voltage
V
2.5
2.5
2.5
2.5
7.5
– 20
250 max./100 max.
550 max.
1.000
–5
NAT
NAT
+5
+ 15
1.330 min.
4.000 min
NAT
TECHNICAL DATA
Nominal response temperature
Maximum allowable operating temp.
Max. allowable operating voltage at + 25 °C
Max. allowable power dissipation at + 25 °C
Insulation strength (between leads and outer insulation)
also for threaded sensor
Conductors - silvered copper wire with teflon insulation
Insulation stripping
Conductor cross-section
80 ° to 180 °C in steps
of 10 °, plus 145 ° and 155 °C
T
max.
200 °C
U
max.
25V (per bead)
690 mW
2.5 kV
PTFE
Triple PTC
Temperature
°C
– 20 to
NAT
NAT
Resistance
measuring Voltage
V
7.5
7.5
7.5
7.5
– 20
750 max./300 max.
1.650 max.
4.000 min.
4.000 min.*
–5
+5
+ 15
NAT
NAT
approx 10 mm
0.25 mm
2
for single, double
and triple PTC’s
* one PTC might reach
NAT
+ 15 °C, while the second or even both
of the others could still remain at room temperature.
CONDUCTOR LENGTHS
Single PTC
Double PTC
Triple PTC
500 mm 10 mm
500 - 180 - 500 m 10 mm
500 - 180 - 180 - 500 mm 10 mm
The PTC’s resistance values for motor protection are
specified in DIN 44081/44082. Resistance values
below
NAT
–20 are not specified, and resistance
when cold is no indication of the PTC’s condition. It is
ideally between 40 - 200 ohms but can be anywhere
between 35 - 250 ohms.
The greatest resistance change occurs between
5 °C either side of
NAT
, being at least 15%/K.
SPECIAL VERSIONS
PTC’s are also available in many special housings
(can be manufactured to customers specifications)
Twin/double and triple PTC’s are available with
standard or mini-bead.
INSTALLATION TIPS
For PTC temperature sensors in electrical windings:
- the thermistors can only be inserted in the windings
before impregnation
- it is advisable to embed one in each phase, if
possible in the centre of the coil generating most
heat, and generally on the outflow side of any air
movement
- air inflow onto the temperature sensor will interfere
with heat transfer
- if using varnish/lacquer which is not chemically
neutral, suitability tests must be undertaken by the
customer
- WARNING! It is very important that the sensor must
be installed parallel with the copper of the winding,
so that the teflon leads can assume the form of the
rest of the winding and thereby retain the high-
voltage resistance rating.
QUALITY STANDARD
Random testing is carried out according to DGQ
P90/P10 (DIN 40080). AQL values can be fixed by
arrangement.
ORDERING INFORMATION
Quantity
1.000
Type
YD1
Temperature
code No.
C 510
Resistance
max.
250 ohms
PTC-Thermistors
02-02-02
1000-Y-180
Single PTC
YD = standard size bead 4 mm with shrunk-sleeve
YG = standard size bead 4 mm with shrunk-sleeve and epoxy seal
YGM = mini-bead 3 mm with shrunk-sleeve and epoxy seal
Type
YD1
YD1 C508
YD1 C509
YD1 C510
YD1 C511
YD1 C512
YD1 C513
YD1 C514
YD1 C545
YD1 C515
YD1 C655
YD1 C516
YD1 C517
YD1 C518
Type
YG1
YG1 C508
YG1 C509
YG1 C510
YG1 C511
YG1 C512
YG1 C513
YG1 C514
YG1 C545
YG1 C515
YG1 C655
YG1 C516
YG1 C517
YG1 C518
Type
YGM1
YGM1 C508
YGM1 C509
YGM1 C510
YGM1 C511
YGM1 C512
YGM1 C513
YGM1 C514
YGM1 C545
YGM1 C515
YGM1 C655
YGM1 C516
YGM1 C517
YGM1 C518
Resp.
Std. Colour code
temp.
NA
80
90
100
110
120
130
140
145
150
155
160
170
180
5
5
5
5
5
5
5
5
5
5
5
5
5
white - white
green - green
red - red
brown - brown
grey - grey
blue - blue
white - blue
white - black
black - black
blue - black
blue - red
white - green
red - white
TEMPERATURE-RESISTANCE CURVE
Triple PTC
YD = standard size bead 4 mm with shrunk-sleeve
YG = standard size bead 4 mm with shrunk-sleeve and epoxy seal
YGM = mini-bead 3 mm with shrunk-sleeve and epoxy seal
Type
YD3
YD3 C508
YD3 C509
YD3 C510
YD3 C511
YD3 C512
YD3 C513
YD3 C514
YD3 C545
YD3 C515
YD3 C655
YD3 C516
YD3 C517
YD3 C518
Type
YG3
YG3 C508
YG3 C509
YG3 C510
YG3 C511
YG3 C512
YG3 C513
YG3 C514
YG3 C545
YG3 C515
YG3 C655
YG3 C516
YG3 C517
YG3 C518
Resp.
temp.
NA
80
90
100
110
120
130
140
145
150
155
160
170
180
5
5
5
5
5
5
5
5
5
5
5
5
5
Std. Colour code
YD
YG
white - black - black - white
green - black - black - green
red - black - black - red
brown - black - black - brown
grey - black - black - grey
blue - black - black - blue
white - black - black - blue
white - black - black - black
black - black - black - black
blue - black - black - black
blue - black - black - red
white - black - black - green
red - black - black - white
Mini PTC
YGM = mini-bead 3 mm with shrunk-sleeve and epoxy seal
Type
YGM3
YGM3 C508
YGM3 C509
YGM3 C510
YGM3 C511
YGM3 C512
YGM3 C513
YGM3 C514
YGM3 C545
YGM3 C515
YGM3 C655
YGM3 C516
YGM3 C517
PTC-Thermistors
02-02-02
1000-Y-180
Threaded housing
YGM mini-bead 3 mm with shrunk-sleeve and epoxy seal
Type
EF1
EF1 C508
EF1 C509
EF1 C510
EF1 C511
EF1 C512
EF1 C513
EF1 C514
EF1 C545
EF1 C515
EF1 C655
EF1 C516
EF1 C517
EF1 C518
Resp.
temp.
NA
80
90
100
110
120
130
140
145
150
155
160
170
180
5
5
5
5
5
5
5
5
5
5
5
5
5
Std. Colour code
white - white
green - green
red - red
brown - brown
grey - grey
blue - blue
white - blue
white - black
black - black
blue - black
blue - red
white - green
red - white
Resp.
temp.
NA
80
90
100
110
120
130
140
145
150
155
160
170
180
5
5
5
5
5
5
5
5
5
5
5
5
5
Std. Colour code
YGM3
white - yellow - yellow - white
green - yellow - yellow - green
red - yellow - yellow - red
brown - yellow - yellow - brown
grey - yellow - yellow - grey
blue - yellow - yellow - blue
white - yellow - yellow - blue
white - yellow - yellow - black
black - yellow - yellow - black
blue - yellow - yellow - black
blue - yellow - yellow - red
white - yellow - yellow - green
red - yellow - yellow - white
YGM3 C518
When ordering please specify thread size, otherwise the stock M4 size will
be supplied.
PTC SWITCHING DEVICE
TYPE TKA1, TKA2
PTC RELAY UNIT
TYPE TKA1, TKA2
FEATURES
q
sensor and relay unit are both interchangeable
q
fixed sensor response temperature from
80 - 180 °C
q
safe monitoring of sensing circuit and sensor
q
upto 6 PTC’s can be connected
q
quick installation housing (DIN-EN 50022) or
screw fixing (M4)
q
also available with push-button test light
(can be retrofitted)
ELECTRICAL DATA
POWER SUPPLY:
Voltage:
42 V, 110 V, 230 V, 400 V, 415 V0 ac
Special voltages:
eg dc, please ask
Tolerance:
+ 10 % ... – 15 %
Power consumption:
less than 3VA
Frequency:
40 – 60 Hz
Operating temp.:
– 20 °C to 60 °C
RELAY OUTPUT
1 change-over contact
Switching capacity at 250V
Use category AC 11 3A
Continuous current rating 6A
Max. current rating of overload fuse 6 A
VOLTAGE TESTING
Test voltage between supply, relay contacts and PTC
circuit, 2.5 kV
Test voltage on output contacts, 1.0 kV
PTC CONNECTION
Max. quantity of PTC connectable:
6 pcs
Terminal voltage for PTC’s
Range:
larger 1.6 k
Smaller 3.6 k +/- 10 %
DESCRIPTION
These PTC relay units have been developed as state
of the art devices. All other commercially available
units can be replaced with ours.
Relay unit and sensors as per DIN 44081 and 44082
give optimum protection against thermal overload.
Together they provide a rapid and reliable motor-pro-
tection system.
Two basic formats are available:
TKA1 for applications where space is at a premium
TKA2 in a DIN housing, eg. for use in control panels
Any PTC thermistors that conform to DIN 44081 or
44082 can be connected to these relay units.
SPECIAL VERSIONS
PTC sensors can be delivered with a warning label/
tag. This has a 4 cm cord, so that the tag can be seen
from the exterior when attached to the motor, equip-
ment or plant, and will warn against applying voltages
higher than 2.5V (surely this should be 2.5 kV).
The ordering code for this label ist K105.
INSTALLATION
Screw or snap-on fixing TKA2
Installed on a 35 mm rail to DIN 46277 B.3 by means
of an integral snap-on housing.
Screw fixing TKA1
We reserve the right to alter specifications without notice.
8415 Mountain Sights Avenue • Montreal (Quebec), H4P 2B8, Canada
Tel: (514) 739-3274 • 1-800-561-7207 • Fax: (514) 739-290
E-mail : sales@cantherm.com • Website: www.cantherm.com
PTC-Thermistors
02-02-02
1000-Y-180
CANTHERM
Test/Measurement
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