714_6099cbb73adfc-Matsuo_Electric_Liquid_Thermostat | electroverge
                     Matsuo's temperature control devices contribute to 
energy saving for the future of our global environment.
Matsuo Electric Co., Ltd. was founded in 1960. 
Since the foundation, we have been proud of our "no imitation" policy in that we always try 
to make what others do not make.
Certified by ISO 9001
All products compliant to the RoHS Directive
TPS Certification List
Standard CMJ UL VDE
Model (Japan) (U.S.A.) (Germany)
MQT8·11 J-44,J-46,J-129 E-104206 40007786
M3·M2·M2F J-130, J-135 E-104206 40013485
NOTES: CMJ (Certification Management Council for Electrical and Electronic Components 
and Materials of Japan) is an established Japanese standard.
1
 What is the Temperature Powerful Sensor (TPS)? 
Applicable area for Each thermal device (Difference between Controller and Protector)
Positioning Chart of Various thermal device
Applicable area by Matsuo • Thermostat is a temperature switch that controls
temperature in a specified range with a heater (heat
100,000 source) or cooler (cooling device, fan) as load.
Electronic Thermostat 50,000 • A variety of thermal device includes electronic types,
for Laboratories and Research bimetal types, liquid expansion types, thermal reed
Centers with Full Functions 30,000 magnetic force types, temperature fuses, etc..
(Suitable for data collection by connecting to PC and/or measurement device ) 10,000 • Two major functions of thermal device are controller
5,000 and protector.
TPS 3,000
(Temperature Power Sensor) Controller
Bimetal Type 1,000
Dedicated Thermostat used to maintain temperature in a 
Bimetal Thermostat 500
TRS for Small Consumer
specified range. The most common product is an 
Capillary Electric Appliances
Thermostat Thermal Reed (Toaster, electric grill, electronic thermostat.coffee-maker,
Switch 300Japanese foot Required characteristics are small ON/OFF 
warmer, etc.)
temperature difference (differential), accuracy, long 
200
Disk Type life, etc.. 
of thermal protector
(Bimetal Type)
Protector
100
It is mainly used for the safety device of heaters, 
50
motors, etc.. This type of thermal protector is used 
Thermal Fuse as a safety device that cuts electric power when the 
temperature rises over the specified temperature. 
20 Generally, it accepts large differential and short life .
The chart above (Position for Various Thermostat) shows the positioning of six popular products. 
The largest circle on top indicates the electronic thermostat's position.
Electronic Thermostat (for laboratories and research centers)
The representative controller is, not to mention, an electronic thermostat. However, the conventional electronic 
thermostat is expensive and used specifically for laboratories and research centers.
Temperature Powerful Sensor(TPS)
The TPS is comprised of a sharp snap spring which can be used semi-permanently, a flat bimetal free from material 
strain, and two flat bimetals for improving the sensitivity. As a result, the TPS can regulate temperature accurately, 
which is a replacement of the electronic thermostat.
Capillary Thermostat (liquid expansion method)
Most controllers had been this type before electronic thermostat was introduced to the market and had been utilized 
for both industry and consumer appliances. However, due to its large structure and the heat interference defect in the 
capillary tube, the number of applications seem to be decreasing.
TRS Thermal Reed Switch (magnetic type)
The problem is that the contact capacity is limited to less than 0.5A and that the contact does not snap or trip. Another 
problem is that this type of product is not suited for planned production because the temperature sensitive magnet is a 
burned component that makes it difficult to control additive elements and burning temperature to enable specific 
operation temperature ranges.
Disk Type of thermal protector
DISK (DISC) type of thermal protector is the general term for a sensor because of its shape. A single disk serves for 
temperature sensing and contact snapping. Because the structure is simple, it is inexpensive and most protectors are 
of this type. It is said that no alternative protector of different structure will be developed soon. However, this disk type 
of thermal protector has defects because its differential is large and specified temperatures gradually change because 
steel (non-spring material) is used for the contact and it must trip against large internal stress. Therefore, this structure 
cannot be used for a controller.
Thermal Fuse
As it is well known, thermal fuses cannot be used repeatedly. It is a primitive type of protector. Due to its simplicity and 
low price, demand for this safety device will continue.
2
Protector Controller
Unit price (yen)
 Difference between Temperature Powerful Sensor(TPS) and Disk Type of thermal protector 
Operating Principle of Temperature Powerful Sensor(TPS) Operating Principle of Disk Type of thermal protector
Bimetal thermostats for precise control applications specifically (Principle of operation) By forming a bimetal strip into a 
designed and built with miniaturization and low cost in mind. Each dome shape (hemispherical, dished 
shape) to acquire snap action, the 
consists essentially of a spring, which has virtually indefinite service Before heating Low expansion side disk type protector is characterized 
life and sharp, distinctive tripping characteristics, and a flat bimetal by its simplicity of construction. The 
which is distortion free. Two pieces of bimetal are used in simple design facilitates volume production and, because of its low 
combination to increase sensitivity. cost, account for 80% of the entire 
After heating High expansion side bimetallic thermal protector market 
Shown below are the switching positions of the "X" type. in the world.However, the bimetallic material has 
physical properties similar to 
Snap spring (Sectional view) ordinary steel material and is not a 
Bimetal
Cap Pin spring material in itself. During the 
Normal temp.position A
Bimetal course of repeated tripping, it is no 
Returning position C Mounting bracket
Spacer wonder that just a strip of ordinary 
metal, formed into a dome, will 
Operating position B
Contact Bimetal progressively distort, or lose its 
Stationary leaf
Differential about 3~10˚C shape, and return to its original Retainer shape of a flat strip.
Contact
The narrow differential, sharp snap action spring plays an important The life of this style of thermal Contact protector is generally limited to 
role in achieving desirable thermostatic response. This snap spring Spring several thousand to tens of 
turns on and off over an exceptionally small distance (approx. Case thousands of operations at best. 
0.05mm), or in terms of temperature, approx. 3˚C Beryllium bronze Although they demonstrate almost Terminal ideal characteristics as protectors, 
snap spring can withstand at least 2 million operations. they fall short of being qualified to 
serve as controllers.
Characteristics of Temperature Powerful Sensor(TPS) and Disk Type of thermal protector
Matsuo thermostat (TPS) Other manufacturers
Controller Protector Protector
Ordinary temperature Middle temperature High temperature Limited temperature
Setting temperature –10˚C to 100˚C 110˚C to 200˚C 200˚C to 400˚C 40˚C to 230˚C
Electrical More than 100,000 More than 20,000** Less than 10,000***
Life*
Mechanical More than 10,000,000 More than 10,00,000 Less than 10,000***
A rank : 2 to 5˚C Aprox.10 to 20˚C(setting Temp.40~100˚C)
Differential B rank : 3 to 6˚C Aprox.15 to 30˚C(setting Temp.100~150˚C)
E rank : 10 to 20˚C F rank : 23 to 37˚C
 (hysteresis) C rank : 5 to 8˚C Aprox.20 to 40˚C(setting Temp.150~230˚C)
D rank : 8 to 12˚C There is no classification like A,B,C,D,E & F
Rated load MQT model : AC125V/2A AC125V/3~5A AC125V/50mA AC125V/15A
 (resistive) M2,M3 model : AC125V/5A
Contact type ON or OFF  on rise OFF  on rise ON or OFF  on rise 
(to be specified on order) ON or OFF  on fall 
TPS stands for Temperature Powerful Sensor
Matsuo thermostat: *Guaranteed cycles without drift by Matsuo thermostat
 ** Guaranteed cycles without drift except higher setting temp. than 300˚C
Other manufacturers *** The drift will start from the beginning
Glossary of Thermostat Terms
•Differential •Tolerance
Means ON/OFF temperature difference (also called Hysteresis). Means an acceptable range in temperature, expressed as 
OFF point: 30˚C±3˚C
Differential: 3~6˚C
3
 Difference between Temperature Powerful Sensor(TPS) and Disk Type of thermal protector 
Comparison table
TPS(Controller) Disk(Protector) Electronic(Controller)
Bimetal disc
Model
Bimetal disc
Before heating
Principle of
operation
After heating
Dual flat bimetal with a snap Dome shaped bimetal made by
Configuration spring assembled by hand. stamping machine. Thermister + Processing Circuit
Sharp action switching by a snap Ordinary steel material dome
Mechanical spring.   Stress free switching is shaped bimetal accumulates
characteristics N/Aexecuted by a spring type of flat mechanical stress at the edge of
bimetal. the dome.
Life(Mechanical) Long life:  10 million cycles Short life:  2,000 ~ 10,000 cycles Long life:  10 million cycles
Tolarance ±1.5K ±5K~±8K ±1.0K
Accuracy ±0.2K (Repeatability) ±5K~±8K ±0.1K
Stability Setting  temperature does not Setting temperature moves toward Setting  temperature does notmove during its life cycles the lower side during its life cycles move during its life cycles
Selectable Not selectabl Selectable
Rank A : 2~5K
Differential Rank B : 3~6K
10~40K 0.5K increment
Rank C : 5~8K
Rank D : 8~12K
Number of pieces failed per 1
FIT Not applicable due to protector FIT = 300 to 3000
(Failure In Time) billion hours.  FIT = 3
Failure rate = 0.00025% Unknown failure rate (Very high) Failure rate = 0.025 to 0.25% 
Size Compact Compact Big
Application Temperature regulating Power shut down for over heating Same applications as the TPS
Semicon. manufacturing equipment Basically, power shut down is the but limited use due to its size.
Semicon. Testing equipment. only application for Protector.
Ultrasonic diagnostic equipment
Anti-fog, frost, freezing or fans
Surveillance camera lenses
Out door money exchangers
Road snow melting systems
Console box ADSL for internet
Mobile phone ground stations
Many other industries
Number of
manufacturer Only 1 company (Matsuo) More than 1,000 to 2,000 companies More than 100 to 200 companies
Who is our 1. From 1 to 100,000 pcs per order 1. From 10,000  to 1 mil. pcs per order 1. From 1 to 100,000 pcs per order
customer? 2. High quality, high valued equipment 2. Low quality, low valued equipment 2. High quality, high valued equipment
3. Industrial use 3. Home appliance use 3. Home appliance and industrial use
Semiconductor industry 4. Industrial use (limited) Semiconductor industry
Telephone & internet industry Motor Telephone & internet industry
Risk control industry Transformer Risk control industry
Medical  industry Over-heat protection for other equipment Medical  industry
Transportation industry Transportation industry
Other industries
4
 Selection Guide 
2 Amp. series for ordinary temperatures ( AC125V/2AAC250V/1.3A ) [–10˚C~110˚C] Double seal type (DS) is available for all models.
MQT 8K Standard model of the 2 Amp. series. 
With mounting holes. With a 150mm lead.
MQT 8H Same as 8K, but without the mounting hole. With a 150mm lead.
MQT 8KT With a #110 tab.
A receptacle with two holes (female housing) is provided.
MQT 8HT Receptacles can be used separately for each terminal.
MQT 11K 11K and 11H consist of built-in fuse for dual safety.
MQT 11H  (The photo is 11H)
Same as MQT8H, but double-sealed with another 
MQT 8H(DS) vinyl tube covering for improved waterproofing 
and anti-shock performance.
5 Amp. series for ordinary temperatures ( AC125V/5A Double seal type (DS) is AC250V/3A ) [–10˚C~110˚C] available for all models.
M 3 Standard 5 Amp. Series with 2 mounting holes. With a 150mm lead.
M 3(Z) It is an M3 type with a back contact. The external shape is the same with three 150mm leads (white, black and red).
Thin version of the 5 Amp. series. The differential is 
M 2 approximately 10˚C. Long life model. 
Without a mounting hole. With a 150mm lead.
M 2F Fail-safe design with a built-in fuse in the series with M2.
Sealed in a vinyl tube.
MQT 5S A back contact model (with 3 lead wires) is also available.
Liquid Temperature Control Thermostat
It is a completely sealed thermostat which is screwed into 
MQT 81P a threaded hole on the side of a liquid tank. While the inside of the tank is waterproof, the lead section is not. 
2A type For a PT3/8” screw. The body is made of brass and 304 stainless steel.
It comes with a DIN connector which is screwed into 
MQT 72P a threaded hole on the side of a liquid tank. 
5A type For a PT3/4” screw. The body is made of brass.
MQT 83P It is a type that is inserted from the top of the tank.
2A type The body is made of 304 stainless steel.
TPS for mid and high temperature ( AC125V/3AAC250V/2A ) [110˚C~400˚C]
M 2H This is a thin version of the 3 Amp., and controlfrom 110˚C~200˚C. With a 150mm lead.
M 2HA Control from 200˚C~400˚C.
5
Temperature Power Sensor (Controller)
 Liquid Temperature Control Thermostat (Narrow differential and long life) 
Thermostats for liquid temperature control with a built-in MQT series. 
The temperature setting range is –10˚C to +110˚C, and rating/characteristics are 
equivalent to the standard series of MQT.
MQT81P Features:
MQT81P(sus)   1.) Simple design for liquid temperatureOpposite side 19        measurement.
PT3/8
  2.) 2 Amp. applications only.
  3.) Body materials are brass and 
       stainless steel-304.
26 14 (10)
50   4.) The part to be immersed in the liquid 
       is waterproof. 
       The lead section is dripproof.
Standard lead wires are AWM1015/AWG22 black,150mm length
113
MQT72P 78.6(Body) 36.2(Socket) Features:
33 17 16 (10.8)   1.) Ideal for liquid temperature measurement.
  2.) DIN connector provided. Convenient
       for wiring in flexible protective tube.
  3.) 5 Amp. applications only.
PT3/4   4.) Body material is brass.
Opposite side 30   5.) Applicable to IP65.
Plug,GSA200N
Socket,GDM2011 A
A is the exit for lead wires in a flexible protective tube 
(Cable with 6 to 9mm external diameter is used)
MQT83P Features:
  1.) It can be inserted by providing a hole
       at the tank top or on the lid.
  2.) For liquid temperature measurement,
       the thermostat must be immersed
       at least 50mm from the surface.
  3.) 2 Amp. applications only.
(The two or three thermostats can be incorporated inside a long tube)   4.) Body material is stainless steel.
  5.) The part to be immersed in the liquid is
       waterproof. The lead section is dripproof.
Double/triple long thermostats
A multi-purpose liquid temperature thermostat
can be made by providing two or three 
thermostats inside a MQT83P long tube.
1t
15 5 (Example)  
L   Turn the heater on at 5˚C or lower.
  Turn the cooler on at 35˚C or higher.
Available tube length: 200mm/450mm, Standard lead wires : AWM1015/AWG22 black, 150mm length   Shut the power off at 60˚C or higher.
MQT83PD Features:
  1.) Variation of MQT83P.
  2.) DIN connector provided.
        (Hirshmann socket GDS207)
        (Hirshmann plug GSSA200)
  3.) Applicable to IP65.
(Cable with 6 to 9mm external diameter is used)
PT3/8
200 11 5 36
NOTE: All drawings are in 40% of full size to help you compare the sizes of products.
10
13
14
21.5
13
36   p.c.d.
50
28 Approx. 50
 Technical Data (TPS) 
Internal Heat Generation vs. Load Load Current/Internal Heat Up/Differential Relations Load Current/Internal Heat Up/Differential Relations
(2Amp. Series) (5Amp. Series)
Contact capacity is limited for electrical 
A B C D show differentials. A B C D show differentials.
components such as relays, thermostats 
D rank D rank
or switches with make and break contact, ± ±12 10 2 12 10 2
because the contacts generate heat. 11 11
A B C rank switch
Since a thermostat, in particular, reacts to 10 10
9 C rank 9 C rank
temperature change, the heat generated 8 6.5±1.5 8 6.5±1.5
7 B rank 7 Heat up inside thermostat caseat the contacts affects its operating B rank
6 4.5±1.5 6 4.5±1.5 
temperature and differential. Matsuo's se5 A rank t ca 5 A rank
thermostats, as seen in the graph, have 3±1 os
ta
4 4 4±1rm
3 de 
the
sufficient current capacity with an ample insi 3
2 eat u
p 2
margin for the heat generated by the H A B C rank switch D rank switch1
D rank switch 1 M2·M2F Model
contacts. 0.5A 1A 1.5A 2A 1A 2A 3A 4A 5A
Load current (AC125V)(unit power factor 1) Load current (AC125V)(unit power factor 1)
Relation between Life and Load Mechanical Life/Load Current (2Amp. Series) Mechanical Life/Load Current (5Amp. Series)
10,000,000 10,000,000
7,000,000 7,000,000
Temperature Power Sensor, TPS can 5,000,000 5,000,000
perform more than 10 million mechanical 
operations. However, under heavy loads, 
the life will be reduced due to the wear of 1,000,000 1,000,000
contacts. A life of 100,000 cycles of 500,000 500,000
operation is guaranteed at the rated load 
current. Under reduced loads, the life A A
100,000 B C D 100,000 B C D
lasts longer. See the graph on the right.
50,000 50,000
10,000 10,000
0.5A 1A 1.5A 2A 2.5A 1A 2A 3A 4A 5A
Load current (AC125V)(unit power factor 1) Load current (AC125V)(unit power factor 1)
"Heat Time Constant" of Temperature Power Sensor "Heat Time Constant" of the MQT8H, M2, and M3 (Condition: 1 ~ 1.5m/sec. wind speed in constant
   M  2          temperature oven)
heat/time
Any object has its own heat capacity. Generally, large objects do not easily assimilate MQT8H100 constant:160sec. M2
˚C
with ambient temperature, on the other hand small objects do. Moreover, objects with M3 M3
90 MQT8H
heat/time
heat/time constant:
good heat conductivity assimilate easily, and objects with small heat conductivity do constant: 195sec.102sec.
not easily assimilate. Assimilation with ambient temperature is expressed by a "Heat 80
Time Constant". 70
We measured the "Heat Time Constant" of the MQT8 Series Temperature Power Line of 60% of 70˚ (100-25)
Sensor. 6058
"Heat Time Constant" (expressed by time to reach 60% of the range of temperature 50 Line of 60% of 58˚ (80-25)
46
change) are the same as indicated in the chart to the left, regardless the range of 
40 Line of 60% of 46˚ (60-25)
temperature change, if the material and measurement conditions are the same. 
The "Heat Time Constant" is 102 seconds for the MQT8 series, 160 seconds for the 30 25˚C (base temperature)
M2, and 195 seconds for the M3 when the device is measured under 1 to 1.5m wind 20
speed, respectively. 0
As water takes heat from objects faster than air, the "Heat Time Constant" measured in ˚C 100sec. 200sec. 300sec. 400sec. 500sec. 600sec.
Reaching time/second
water is smaller than that measured in air. 
Practical Heat Capacity Measurement Simple Thermostat Heat Capacity Comparison
A heat/time constant is reasonable indicator in precisely grasping the heat capacity 10˚C
of an object. However, it is too academic. The following chart may help you see how 9
the temperature of thermostats assimilates with the changing ambient temperature. 8
7
If the ambient temperature changes faster, the thermostat's affiliation for the 6
ambient temperature is delayed. On the other hand, if it changes slowly, the 
5
thermostat can follow the ambient temperature change. M3
4
M2
3
MQT8H·H702
2
1
0
1˚C/0.2min1. ˚C/0.5min1. ˚C/1min. 1˚C/2min. 1˚C/3min. 1˚C/4min. 1˚C/5min.
(Fast)Change rate of ambient temperature(Slow)
13
Life (number of operations) Temperature rise( ˚C)
Delay of adjustment Life (number of operations) Temperature rise( ˚C)
 Technical Data (TPS) 
Something to be considered when using a Thermostat with DC Voltage Circuits
1.)The thermostat contacts may be damaged by arcs. How the because it is kept heated until the gap becomes large enough 
damage occurs is affected by four factors as follows: to disconnect the arc. 
Because the Temperature Power Sensor is small in size, the (d) Quality of the contact material and the condition of the contact 
contact gap (distance between the two contacts) cannot be surface If the contact is damaged and any projection is 
made large. The standard is 0.1 mm. However, this Sensor has a created (shown on the left), the arc will not be 
sharp cut off mechanism and restores the 0.1 mm gap easily disconnected. 
instantaneously. 2.)As you know, when the contact opens, the arc continues for DC, 
(a) Voltage but easily disconnects for AC. On the other hand, for AC, the 
Voltage is reflected by the contact gap. We ensure up to 250V phase of voltage alternates every 1/50 to 1/60 of a second, so 
AC or 48V DC (using a spark killer). that any accident in which an arc is drawn does not occur. As DC 
(b) Current always runs in one direction, the arc is not easily disconnected.  
The current level mainly relates to what extent the contact is 3.)What does "a contact is damaged" mean exactly? 
damaged by an arc, not whether the arc is disconnected or The surface or fringe of the contact is often contaminated by 
not. Because the arc of a high current causes rapid heating to carbon created by the spark or arc when the contact is activated. 
the contact, adverse effects such as early contact melting or Deposits of carbon increase contact resistance between the two 
surface oxidization of the contact may occur. contacts. A larger resistance naturally causes heating of the 
(c) Open and close speed of the contact contact and carbon deposition becomes more likely. In addition, 
If the gap between two contacts increases up to 0.1 mm the current decreases, and the temperature of the load heater 
instantaneously, the arc will be easily disconnected. However, does not easily rise.
if its action is slow, the contact will be damaged faster 
Cross Bar Contacts (Micro Capacity Contacts)
For ordinary contacts, the maximum current is indicated as 2Amp. max. etc. What is the minimum current? This is generally around 50~100 
mA. Currents below this range are covered by special contacts for micro current.
The minimum current for ordinary contacts of our 2 Amp. series is also 50 mA. For currents below 50 mA, Crossbar contacts, called K 
contacts, are applied. Since the current range covered by cross contacts is 1~ 49 mA.
The structure of crossbar contacts is that of two noble metal contacts in trapezoidal shape, contacting with each other crosswise. The 
benefit of this structure is that there will be smaller possibility for contact failure because it can assure the large contact pressure per unit 
area.
Contact Type Indication
As we manufacture thermostats to be used as controllers, their model 
designation is more complicated than is the case of protectors. Refer to X Y YZ
the diagram on the right. High temp.operation point
• DifferentialContacts which open when the temperature rises are designated as Low temp.operating point
X, and those which close when the temperature rises are designated X Y YZ
as Y. Shown in the diagram is the temperature at which the contacts 
( Solid line indicates closed contact. o_perate when _the temperature rises (the high temperature side). Broken line indicates open contact. )
  X [Xbar] and Y [Ybar] are used for contacts _that operate when the _
temperature falls (the low temperature side). X [Xbar] indicates the contact that closes when the temperature falls. Y [Ybar] indicates the 
contac_t that opens when the temperature falls. Z indicates transfer contacts. XZ is the main contact that opens when the temperature 
rises. XZ [Xbar Z] is the main contact that closes when the temperature falls.
•C is the standard rank designation for X contacts and B is standard for Y contacts. Please consider X is C ranked and Y is B ranked, 
unless otherwise indicated.
Model Designation Method
MQT8K    K 35 X C 2
MQT8H K35XC represents a thermostat with crossbar 
contacts (K means crossbar contact). Tolerance indication
  (for custom orders only)
For 5 Amp. Series with a back contact, a model name will DIFF. rank indication
be, for example, M3 35XZB, where Z means contact with Contact structure [X, X̄, Y, Ȳ]
the back contact. Setting temperature
K means “crossbar contact”
Model name Space
2Amp. : MQT8K,8H,8KT,8HT,11K,11H,MQT81P,83P,83PD
5Amp. : M3,M2,M2F,MQT5S,MQT72P
For mid temperature : M2H
14
   temperature temperature
Low             High 
Main contact
Back contact
Main contact
Back contact
 Technical Data (TPS) 
OPERATION TEMPERATURE DATA SHEET Performance of MQT8H 30YB
This data sheet shows you ON temperature and OFF 
temperature for 10 pieces of MQT8H 30YB.
Model: MQT8H 30YB (VDE)
Highest ON temperature:
Operating temperature Sample No.3 has the highest ON temperature among of 
Characteristics ( ˚C) these 10 pieces and its deviation from the setting 
temperature of 30˚C is +1.8˚C which is in the range of our 
Sample ON OFF DIFF. 
standard tolerance of ±3K.
No. 30 ± 3K 3 — 6 The contacts of sample No.3 will always switch ON at 
1 30.2 24.4   5.8 31.8˚C±0.2˚C on temperature rise, and OFF at 26.3˚C±0.2˚C 
2 31.4 25.8   5.6 on temperature fall.  Repeatability is ±0.2˚C.
Each sample has own differential between 3 and 6K, and the 
3 31.8 26.3   5.5 differential value of this sample No.3 is 5.5K which is 
4 29.3 24.0   5.3 permanently fixed and not fluctuate at all.
5 29.5 23.8   5.7 
Lowest ON temperature:
6 29.4 24.4   5.0 Sample No.4 has the lowest ON temperature among of these 
7 30.2 25.2   5.0 10 pieces and its deviation from the setting temperature of 
8 30.6 24.7   5.9 30˚C is −0.7˚C which is in the range of our standard tolerance 
of ±3K.
9 31.6 26.5   5.1 
10 29.6 24.0   5.6 
Average ON: 30.4 ˚C Life:
100,000 cycles guaranteed at our specified electrical rating 
Average OFF: 24.9 ˚C
shown below.
Average Diff : 5.5K 0.6A/AC250V, 1A/AC125V for diff. rank A.
Max deviation: +1.8˚C (No.3) 0.9A/AC250V, 1.5A/AC125V for diff. rank B
1.3A/AC250V, 2A/AC125V for diff. rank C and D.
Temperature setting tolerance: 
Smaller electrical rating makes longer life and mechanical life 
± 3K will be more than 10 million cycles.
Repeatability : 
± 0.2K 
Topics
1.)Housed in a compact closed case.
2.)Mechanical service life of 10 million operations and electrical service life of at least 100,000 
operations, guaranteed. 
At least 500,000 operations for 1/2, 1 million operations for 1/4 and 7 million operations for 1/20 
of the rating, guaranteed.  
3.)With the narrowest possible differential of about 3˚C, the product finds a considerably wide 
application as a controller. 
4.)Moreover, the price is attractive. It is several times cheaper than an electronic thermostat, 
although it substantially varies by quantity. 
5.)FIT = 2 to 3
FIT (Failure in Time) is used to indicate the failure rate. The unit of FIT is how many failures occur 
in one billion hours. For example, when three failures occur in one billion hours, the failure rate 
(FIT) is 3.
15
Statistical data
 Technical information (knowledge to design a good temperature control system) 
1. Thermostats can be categorized into two groups, controllers and protectors. Please decide which one you want to use. 
•Controllers are thermostats used to maintain 3.)In order for the temperature not to rise beyond
2.)When the ON/OFF function fails,     100˚C, for example, shut the power off using the
temperature within a specified range.      the temperature will keep rising unlimitedly     protector which is activated at 100˚C
•Protectors are thermostats used to cut Protector
electric power when the temperature rapidly 50˚C, for example, 50˚C
rises and exceeds the specified limit. is the desired temperature 
to be maintained. 1.)Maintain a certain temperature     by frequently switching ON/OFF Controller
2. First, correctly understand the eventual purpose of yours temperature control, and then start studying the peripheral material.
•A thermostat controls a load such as the heater, motor, fan, lamp and so on, by sensing a change of temperature.  
                                                       If the thermostat may be affected by the ambient temperature, cover the thermostat with thermal insulation.
What is the atmosphere? 
Thermostat Insulation
Heater
Is the part to be placed a good 
thermo conductive material or not?
•The positional relationship between the thermostat and the heat source (heater or cooler) is important.
Ambient temperature To control the ambient temperature within an enclosure, 
(1) Thermostat place a thermostat in position (2) in the figure. 
A thermostat installed in position (1) cannot provide 
proper temperature control.
Thermostat (2)
Heater
•Determine the optimal differential.
When using a control-type thermostat such as the Temperature Power Sensor (TPS), a customer is likely to select a product 
grade with a small differential. This selection is the right choice answer in a sense, but this type of thermostat operates more 
frequently and may have a shorter service life.  
The tip to configure your best temperature control system is to combine the mutually contradictory factors "accurate control 
and long life" appropriately.
3. Are you using a heater that is too big? 
Are you using a heater that is too big in comparison to the heat capacity of the heated object just because you want to reach the desired temperature 
quickly? If this is the a case, the heater will be operated many times, resulting in a shorter thermostat life, and maintaining the temperature will become 
unstable due to overshooting of the temperature. If you can wait a little longer for the initial temperature to rise, the life could be extended by three fold.
4. It is recommended that a surge protector using a capacitor/resistor be used to protect the thermostat from unfavorable 
    phenomenon such as a surge or arc.
It is sold on the market under the name of “surge killer”, “spark killer” or “arc killer”. As for the installation method, it is 
usually installed in parallel to the contact. Try to install it as close to the contact as possible. Representative characteristic 
of the various loads are listed below by their structure. Give enough margin when designing a system.
1.) Resistive Load   In- rush current i / rated current io = 1
2.) Incandescent lamp  i / io + 10 ~15 times, about 1/3 sec
3.) Fluorescent lamp  i / io + 3 times, within 10 sec
4.) Mercury lamp  i / io + 3 times, about 3 to 5 minutes
5.) Motor and Fan  i / io + 5 to 10 times,  about 0.2 to 0.3 sec
6.) Solenoid  i / io + 10 to 20 times,  about 0.1sec
7.) Electromagnetic conductor  i / io  + 3 to 10 times, about 1/30 sec
8.) Load of capacitor  i / io  + 20 to 40 times, about 1/30 sec
An experimental test might be necessary to determine the level of surge killer.
If you send an actual load sample to us, we will perform a test on your behalf.
16
 Technical information (TPS) 
1. The TPS is an electric component and vulnerable to impact when it is alone.
The TPS is delicate to impacts in the X direction and strong in the Y and Z directions 
(see the figure to the left). When a TPS is dropped from a height of 70 cm to the floor 
Strong
X Y and it sustains an impact in the X direction, a temperature setting error between 2  
Weak and 3  may occur. 
Once a TPS is integrated into your system, it isn’t easily affected by extremely low 
Z impacts compared to when it is alone. This also applies to a TPS wrapped with 
Strong
corrugated fiberboard during delivery. Individual TPS wrapped with corrugated 
fiberboard must not be exposed to dangerous impacts. 
In other words, extreme caution should be taken until a TPS is installed into your 
system after unpacking.  
∗In case you drop the TPS on the floor, please return it to Matsuo Electric for reinspection.
2. Double sealed construction (DS) ensures excellent waterproof and impact resistant performance.
Double sealed (DS) TPSs are sealed with vinyl tubes to improve waterproof and impact resistant performance. 
The DS type has an impact resistance of 240G.
3. Standard TPSs have a dripproof construction.
For standard TPSs, the thermostat is housed in a plastic case with its exits for the leads sealed with a sealant, 
ensuring dustproof and dripproof performance. 
However, repeated material expansion and contraction, and internal air pressure changes caused by thermal 
cycles may lead to wear of the plastic case and sealant, which consequently deteriorates the sealing 
performance. 
Also, pay attention to possible capillary action of the leads.
Part C
Part A
Case Part B
Lead
Sealant
Bimetal switch
Part A has a dripproof construction. 
However, if Part B is exposed to water, the water may come into Part C due to capillary action. Part C and 
its surrounding area are close to the bimetal switch body. Therefore, be careful not to expose Part B to 
water during use.
4. Storage conditions and period
When storing the product for an extended period of time, keep it in a sealed plastic bag as much as possible. 
Always check the contact resistance before use. 
Particularly, Type Y and others with the contacts wide apart require extra attention. 
The storage period is about one year although it depends on the storage conditions.
17