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
Type
Shape
Classification
Lead
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 temperature-
sensing 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
◆TeOmuprfienesrcerarlrfote-umdareseavegesslneo, enpatesnidicdnTgsihtufetbemusrrrotniartsient（eicnieTstohcteeaamrllmppeeadorraraTtiumthereeaⓇrgs）mennoesrtiniitcges.feuTrbrhisitsetaumnticalietzeianrigtaiClt’ssurCsieau-ttrueiemratpteeiomrantpumereraa, gtunreet.ic flux density decreases as the temperature
where ferrites lose its magnetic property.
TheTrmheormiteocrhitaengpersoiptsemrtaigensetic property rapidly at Curie-temperature.
◆ Fea•t urTehseorfmToherirtmeocrihteanasgetesmiptseramtuargensentiscinpgrmopateerrtiayl.rapidly at its Curie temperature, providing quick response times.
(1)
(2)
(3)
••ACS turTTabrbhhiielteeer-artaCermygmuaosprihrnieeiasrtptaetetmeuimasroevispasdttieolaoarbranbloltheeutaarzvaesaagrrcodayeofiranuaTssmshttgiiemcmarssem.o. aiosdrtviuaternecdeaosn,ebdsehcnaaouztsaevraidtrodyuewpseigtnhadssti.omnec,oamspiotuinsdbinagsreadtioo.n
a
compounding
ratio.
Thermal property of Thermorite
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
◆ 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
coil.
◆Long lifetime, High environmental resistance
because of protected contact by glass encasing.
N
◆Reeds in glass tube become magnetized with
mcfioeanlgd©FnnoedrKcetitEtsLiMaeacapuEcdfpThieeeEradlloerdatschl,,eter,aotrFhnnLe(idcs3swr3teC3hiet0oecd1rhnpsUoosStrweanAtp)io•o.a9nrrA5a•e4tKnee-7Edd6aMs6nthE-dc2eT8ondT0nio0mstwac•aecowgrtnw•nnaOewentn.cikdecteEmaestt.cBoromward
S
Boulevard
(switch off).
Glass tube
Contact
Fe-Ni alloy reed
N
S
S
N
SE0201_TRS • 10/29/2018
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