s
for constant temperature heating purpose.
Wide range of temperature characteristic shall make
easier to select most suited heater device matching to
the application.
s Features
1. The heater element itself regulate designated
temperature range.
(Temperature can change depending on how to use it)
2. The temperature pulsation which is observed in case
on-off temperature control system can be eliminated.
3. Out put wattage is decreased automatically when
heat radiation is decreased.
(Over heating is very small compared to constant
wattage heater)
4. Compact and flat surface shall realize easy to
install for various set.
(PTWTA series has electrically insulated heating
surface)
5. Depending on application, these PTC realize dual
voltage use.
(Out put wattage do not change much between 100V
through 260V)
s Applications
Heated vessels (electronic jars, tea pots, etc.)
Contact lens cleaner Portable travel iron
Massager Fragrance
Electric pot
29.5
±
0.5
23
in mm
37
±
0.7
2-ø4.3
19
A
B
6
11
3
3
6.5
PTWSB Series
in mm
ø7.5
13
40
±
0.5
30
±
0.5
ø5max.
ø5max.
1.0max.
7.0
5.3 5.4
1.5
3
21
±
0.5
30
±
0.5
PTWTA Series
Part Number
Curie Point
(
°
C)
Rated Volt.
Max. Volt.
(Vrms)
Inrush Current
(A)
Steady State Current
(at 120Vrms)
(mA)
Steady State Current
(at 220Vrms)
(mA)
Surface Temp.
(Nominal Value)
(
°
C)
PTWSB1BC201T260A00
90 (BC)
120/220Vrms.
260
5.0 max.
28
±
20%
17
±
20%
105
PTWSB1AS201T260A00
135 (AS)
120/220Vrms.
260
5.0 max.
33
±
20%
21
±
20%
130
PTWSB2AH201T260A00
205 (AH)
120/220Vrms.
260
5.0 max.
58
±
20%
35
±
20%
185
PTWSB2AG201T260A00
225 (AG)
120/220Vrms.
260
5.0 max.
65
±
20%
39
±
20%
200
PTWTA1AD201T260A00
280 (AD)
120/220Vrms.
260
10.0 max.
-
75
±
30%
285
Inrush current based on 220Vrms.
Operating temperature range PTWSB1/PTWTA: 0 to +60(
°
C), PTWSB2: 0 to +85(
°
C)
Cat.No.R19E-3 Please read CAUTION and Notice in this catalog for safety. This catalog has only typical specifications. Therefore you are requested
to approve our product specification or to transact the approval sheet for product specification, before your ordering.
R19E3.pdf 01.10.26
2
1
s Terminal Connection
PTWSB Series
POSISTOR
r
A
B
s Power Consumption vs Radiative Plate
PTWSB Series
P
o
w
e
r

R
a
t
i
o

[
W
/
W
o
]
0
300
Surface Area of Radiative Plate [cm
2
]
100
200
1
2
3
4
Relation between power consumption and radiative plate
Wo : Power of POSISTOR
r
Unit
W : Power when POSISTOR
r
s are
installead on radiative plate
Radiative plate : Aluminum plate 1mm thickness
PTWTA Series
P
o
w
e
r

R
a
t
i
o

[
W
/
W
o
]
4
0
Area of Radiation Plate [cm
2
]
100
200
300
400
3
2
1
Ta=25C In Static Air
Wo : Power of POSISTOR
r
Only
W : Power of POSISTOR
r
Mounted
onto Radiation Plate
Radiation Plate : Aluminum Plate with 3mm Thickness
AC120Vrms
AC220Vrms
s Output Power vs Ambient Temperature
PTWSB Series
P
o
w
e
r

R
a
t
i
o

[
W
/
W
o
]
0.8
50
Ambient Temperature [C]
Relation between output power and ambient temperature
Wo : Power at 25C
W : Power at each different ambient temperature
0.9
1.0
1.1
1.2
0
10
20
30
40
s Radiation Plate vs Steady State Temperature
PTWTA Series
T
e
m
p
e
r
a
t
u
r
e

[

C
]
50
0
25
Time [min]
5
10
15
20
100
150
200
250
250C
220C
194C
170C
154C
142C
25cm
2
50cm
2
Area of Radiation Plate (H x L)
200cm
2
100cm
2
300cm
2
400cm
2
Temp. Measuring Point
Ta=25C
In Static Air
AC220Vrms Applied
Radiation Plate : Aluminum Plate with 3mm Thickness
s Area of Radiation Plate and Temp. Deviation
PTWTA Series
T
e
m
p
a
r
a
t
u
r
e

[

C
]
100
0
9
290
200
150
Distance from Center portion [cm]
1
2
3
4
5
6
7
8
L
A
H
AC220Vrms Applied
Radiation Plate : Aluminum of
3mm Thickness
25cm2 Area of Radiation Plate (H x L)
50cm
2
100cm
2
200cm
2
300cm
2
400cm
2
Ta=25C
In Static Air Please read CAUTION and Notice in this catalog for safety. This catalog has only typical specifications. Therefore you are requested
to approve our product specification or to transact the approval sheet for product specification, before your ordering.
R19E3.pdf 01.10.26
3
1
s Continuous Load at High Temp.
PTWSB Series
R
e
s
i
s
t
a
n
c
e

C
h
a
n
g
e

[
%
]
+20
10
0
Time [hr]
10
2
10
3
10
4
+10
0
-10
-20
Measuring Condition : Temperature at 25C
Test Condition : Temperature at 85C 140Vrms AC applied continuously
n=50
s Intermittent Load at High Humidity
PTWSB Series
R
e
s
i
s
t
a
n
c
e

C
h
a
n
g
e

[
%
]
20
10
0
Time [hr]
10
2
10
3
10
4
10
0
-10
-20
Measuring Condition : Temperature at 25C
Test Condition : Temperature at 40C Humidity at 90-95% RH
Applied voltage 140Vrms AC for 30 minutes on 60
minutes off intermittently
n=50 Please read CAUTION and Notice in this catalog for safety. This catalog has only typical specifications. Therefore you are requested
to approve our product specification or to transact the approval sheet for product specification, before your ordering.
R19E3.pdf 01.10.26
Standard Type POSISTOR
r

!
Caution/Notice
4
1
s !Caution(Soldering and Mounting)
1. Please do not fail to install the current fuse in
series so that applied equipment is protected when
"POSISTOR" get trouble by misuse or some other
reason.
2. Please confirm safety of your products after
installing "POSISTOR" by conducting suitable
endurance test for the application.
3. Please provide proper insulation for PTWSB series
because metallic plate is electrically hot too.
s !Caution(Storage and Operating Conditions)
This product is designed for the applications under
ordinary environment (room temperature, normal
humidity and atmospheric pressure).
Do not use under the following environments. Because
all these factors can deteriorate the characteristics
of product or can cause the failures and the
burning-out.
1. Corrosive gas or deoxidizing gas.
(Chlorine gas, Hydrogen sulfide gas, Ammonia gas,
Sulfuric acid gas, Nitric oxide gas, etc.)
2. Volatile or flammable gas
3. Dusty place
4. Under vacuum, reducing pressure or under
high-pressure
5. Place with splashed water or under high humidity
with dewing
6. Place with salt water, oils, chemical liquids or
organic solvents
7. Place strongly vibrated
8. Other place, where is similar like the
above-mentioned environments
s !Caution(Others)
Be sure to provide an appropriate fail-safe function
on your product to prevent a second damage that may be
caused by the abnormal function or the failure of our
product.
s Notice(Storage and Operating Conditions)
PTWSB Series
Store the product under the following condition to
prevent from change of characteristic or discoloration
of terminal.
1. Storage condition
Temperature:between -10 and +40(degree C)
Humidity :less than 75% RH (not dewing condition)
2. Term
Please use this product within 6 months after
shipment by first-in first-out stocking system.
3. Handling after unpacking
After unpacking of the minimum package, reseal it
promptly or store it inside a sealed container with
a drying agent.
4. Place
Do not store this product in corrosive
gas(SOx, Cl etc.) or under sun-light.
s Notice(Storage and Operating Conditions)
PTWTA Series
Store the product under the following condition to
prevent from change of characteristic or discoloration
of terminal.
1. Storage condition
Temperature:between 0 and +40(degree C)
Humidity :less than 85% RH (not dewing condition)
2. Term
Please use this product within 6 months after
shipment by first-in first-out stocking system.
3. Handling after unpacking
After unpacking of the minimum package, reseal it
promptly or store it inside a sealed container with
a drying agent.
4. Place
Do not store this product in corrosive gas
(SOx, Cl etc.) or under sun-light. Please read CAUTION and Notice in this catalog for safety. This catalog has only typical specifications. Therefore you are requested
to approve our product specification or to transact the approval sheet for product specification, before your ordering.
R19E3.pdf 01.10.26
Standard Type POSISTOR
r
Notice
5
1
s Notice(Soldering and Mounting)
PTWSB Series
1. Design aseembling position of "POSISTOR" with
considering heatproof.
2. Make the heat resistance as small as possible,
between the "POSISTOR" and the place it is
connected. Do not use an insulating sheet which is
poor in heat transmission. Install the "POSISTOR"
in the flat surface to maximize the function.
Application of heat resisting grease
(e.g.siliconegrease), into interfaces of "POSISTOR"
substrate - insulator - material to be heated,
will permit effective heat transmission.
3. When more than one "POSISTOR" are used, be sure to
connect them in parallel. If "POSISTOR" are
connected in series, they don't operate normally.
4. When lead wires are connected to "POSISTOR", use
rosin type flux which includes less than 0.2wt% of
chlorine. Also pay attention to connecting method
in order to prevent "POSISTOR" from invasion of
flux, and to heatproof of connecting materials
(