Document
Thermal Sensors
TRS Thermal Reed Switch
Overview
Applications
The TRS Thermal Reed Switch is a highly reliable, precise temperature-sensitive switch ideal for energy conservation.
Its unique proprietary design features a magnet and a temperature-sensing soft ferromagnetic substance called Thermorite®. The material’s magnetic flux density decreases as the temperature increases turning it into a paramagnetic substance at the Curie temperature.
Typical applications include temperature detection and overheat monitoring of electric appliances, heat-retention heater control for rice cookers, defrost for air conditioners and vending machines, roll heater temperature control for copying machines, radiator water temperature detection for automotive electric fan control.
These products have also been attested by the International Relay Association.
Benefits
• High reliability for on/off operations • High-speed response • Long operational life • Excellent environmental durability • Extremely simple circuit design • Compact, light and easy to handle • Dust, explosion and corrosion-proof
Axial Type
• Wide range of operating temperatures available from −10°C to +130°C
• Excellent temperature accuracy of ±2.5°C • UL and CSA approved for TRS5***BLRU 100V • UL approved for TRS5***BLRVU 200V • RoHS/REACH compliant
Wire Harness Type
Case Type
Molded Type
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One world. One KEMET
SE0201_TRS • 10/29/2018
1
Thermal Sensors – TRS Thermal Reed Switch
Ordering Information
M- TRS
3-
50
M
CR
00
Maximum Shape Series Opening/Closing
Power (W)
Operating Temperature
(°C)
Contact
Shape
Lead
Type
Classification
Type
Blank M= Mold
TRS 1 = 10.0 W 3 = 35.0 W 5 = 60.5 W
M10 = −10°C 0 = 0°C 5 = 5°C 10 = 10°C 15 = 15°C 20 = 20°C 25 = 25°C 30 = 30°C 35 = 35°C 40 = 40°C
45 = 45°C 50 = 50°C 55 = 55°C 60 = 60°C 65 = 65°C 70 = 70°C 75 = 75°C 80 = 80°C 85 = 85°C 90 = 90°C
95 = 95°C 100 = 100°C 105 = 105°C 110 = 110°C 115 = 115°C 120 = 120°C 125 = 125°C 130 = 130°C
B = Break M = Make
Blank = Molded axial CR = C shape fixing bar LR = L shape fixing bar SR = S shape
Blank 00 = Wire harness 01 = Lead terminal 01E =Lead terminal (S shape only)
Structures and Principles of Operation
Thermal Reed Switches (TRSTM) are temperature-sensing switches composed of a magnet and a temperaturesensing soft ferromagnetic substance called ThermoriteTM. This material's saturation magnetic flux density
decreaSsetsrauscthteutreemspearantudre Pinrcrienacseisp, alendsitotufrnOs pinetoraa ptiaoranmagnetic substance at the Curie temperature.
V
Rated Voltage (VDC)
Blank = 100 V V = 200 V
U
Approvals
Blank = No approvals U = UL and CSA approved for 100 V and UL approved for 200 V
Thermal Reed Switches (TRS) are temperature-sensing switches composed of a magnet and a temperature-sensing soft
Tempfienercrarroteumarseaegssne, enatsniicdngsituftbeusrrrtniatsen(icneTtohceaarllmpeadorraTimtheeaⓇrg)mnoertiitces. uTbhsistamncaetearitailt’ss
saturation magnetic Curie temperature.
flux
density
decreases
as
the
temperature
◆ Our self-developed Themorite is temperature sensing ferrite utilizing Curie-temperature,
where ferrites lose its magnetic property.
TheTrmheormiteocrhitaengpersoiptsemrtaigensetic property rapidly at Curie-temperature.
◆ Fea•turTehseorfmToherirtmeocrihteanasgetesmiptseramtuargensentiscinpgrmopateerrtiayl.rapidly at its Curie temperature, providing quick response times.
(1) (2) (3)
••ACSturTTabrbhhiielteeer-artaCermygmuaosprihrnieeiasrtptaetetmeuimasroevispasdttieolaoarbranbloltheeutaarzvaesaagrrcodayeofiranuaTssmshttgiiemcmarssem.o. aiosdrtviuaternecdeaosn,ebdsehcnaaouztsaevraidtrodyuewpseigtnhadssti.omnec,oamspiotuinsdbinagsreadtioo.n
a
compounding
ratio.
Thermal property of Thermorite
Permeability Saturation magnetic flux density
6000 5000 4000
Permeability - temperature
(1kHz-0.01Oe)
TC=30
TC=60 TC=90
TC=120
3000
TC=150
2000
1000
0 0 20 40
TC=Curie temperature
60 80 100 120 140 160
Temperature(℃)
Saturation magnetic flux density ‒ temperature
3500
3000
2500
2000 1500 1000
500
TC=90 TC=60 TC=30
TC=150 TC=120
0 0 20 40 60 80 100 120 140 160
Temperature(℃)
Structure of reed switch
Encasing
Glass tube
◆ Reed switch is contact switch comprised of a pair of
Fe-Ni alloy reeds encased in glass tube
with inactive gas. The reeds are switched on or off
by magnetic field of permanent magnet or magnet
Inactive gas
Contact
Fe-Ni alloy reed
coil.
◆Long lifetime, High environmental resistance
because of protected contact by glass encasing.
N
S
◆Reeds in glass tube become magnetized with mcoang©FnnoerKcettEtLiMeacauEcdfThieeErdlloedatchl,eter,aorFnnL(idcs3sw3tC3hit0oec1rhnpUooStrwanAt)io•o. 9nrA5•e4Kne-7Edd6Ms6thE-c.