C A U T IO N
The thermal cutoff is safety product, but installation ways and treatments give great influence to it's function.
Pay attentions to the catalog and following articles when you set up the thermal cutoff, and test and investigate byyourselves.

It is assumed that the customer who uses the thermal cutoffs must determine thetype of thermal cutoffs, their operating temperature, installation position andmethod, and assume the risks and responsibilities associated with these decisions.
1CAUTION FOR INSTALLATION・ Each the thermal cutoff has its rating voltage, rating current, functioning temperature, holding temperature and maximum temperature, andmake sure to use the thermal cutoff within those limits. In the cases of these limits would be ignored and used unsuitable the thermal cutoff
may not work properly. It is not guaranteed that the thermal cutoff work properly current as safety products when they are used unsuitable.
・ FUJI brand the thermal cutoff are made for civilian usage like home electrical appliances, office automations.
Do not use for aviation machinery, medical appliances for life keeping, any appliance of atomic power, etc. All risks and responsibilities must
be taken by users in the case of using the thermal cutoff for improper things.
Testing must be done to check whether your choices of types, function temperatures mounting positions and mounting ways are proper &adjusting.
・ Test enough sets of your final products with the thermal cutoff assembled in normal and abnormal situations, and make sure your selection
are correct.
・ In particular, the closer the temperature is to the functioning temperature of the thermal cutoff, the shorter the life of the thermal cutoff.
・ Do not use thermal cutoffs in liquids such as water or organic solvents, in corrosive atmospheres such as sulfur dioxide gas, chlorine gas, orammonia gas, or in high humidity or high pressure atmospheres. If thermal cutoffs are used in such an atmosphere, there is a risk ofdamage and malfunction.
・ If the thermal cutoff is incompatible with the device in use, or if the thermal cutoff is damaged for any reason There is a possibility that thethermal cutoff may not work properly and the circuit may not be interrupted. Therefore, one or more thermal cutoffs may be installed in series
if more safety is required. We recommend that you do this.

2SELECTION
What degrees of temperature will be the thermal cutoffs mounting position? What electric rating will be applicable?
First of all, set up what is the most suitable thermal cutoff after measuring the increase of temperature at themounting portion. Further, check which approval are required. About temperature of the thermal cutoffs, please do
not exceed a value described in following table when normal usage.
(We strongly recommend If exceed this value, Thermal Cutoffs has a possibility of losing performance.)

Catalog No.

Maximum Using
Temperature（ ℃）

Catalog No.

Maximum Using
Temperature（ ℃）

FTF-1 8 2 ,-2 8 2 ,-4 8 252

FTF-S 0 7 0 J,-S 0 7 1

40

FTF-1 9 8 E ,-2 9 8 E ,-3 9 8 E ,-4 9 8 E

68

FTF-S 0 7 6 J

46

FTF-1 1 2 ,-2 1 2 ,-3 1 2 ,-4 1 282

FTF-S 0 8 2 J,-S 0 8 352

FTF-1 3 7 ,-2 3 7 ,-3 3 7 ,-4 3 790FTF-S 0 9 1 J

61

FTF-1 4 0 ,-2 4 0 ,-3 4 0 ,-4 4 090

FTF-S 0 9 6 J

66

FTF-S 0 9 9 J,-S 0 9 969

FTF-S 1 0 9 J,-S 1 1 279

FTF-S 1 1 9 J,-S 1 1 789

FTF-S 1 2 6 J,-S 1 2 790

FTF-S 1 3 2 J,-S 1 3 290

FTF-S 1 3 9 J90

FTF-S 1 4 2 J,-S 1 4 390

FTF-S 1 5 4 J,-S 1 5 4124

FTF-S 1 6 9 J,-S 1 6 9139

FTF-S 1 8 2 J,-S 1 8 1 ,-S 1 8 7152FTF-S 1 9 2 J

155

FTF-S 2 1 4 J,-S 2 1 5155

FTF-S 2 2 6 J

155

FTF-S 2 2 9 J,-S 2 2 9155

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C A U T IO N

3

MOUNTING POSITION
・ The thermal cutoffs reacts delicately against heat. Mount it at the place where it would react only to abnormal
temperature, and there is no heat influence from other heat sources.
・ When connecting the thermal cutoff to electric wires, make sure that there would be not tensile force, downpressure, torsion etc. to the thermal cutoff.
・ It would be better that the lead wires are used in long size.
・ For the FTF-1, FTF-2, FTF-3 and FTF-4 series, install them in a location where the lead wires are heated as
evenly as possible. If there is a temperature difference, smooth operation may not be possible, which may affectthe electrical insulation performance after operation.
・ If the FTF-S series is installed in such a way that the temperature of the lead wire B is higher than that of the leadwire A, the temperature of the internal thermosensitive pellets will be higher and the life of the thermal cutoff will beshorter.
For this reason, the thermal cutoff should be installed so that it heats up as evenly as possible.

4PRECAUTIONS FOR MOUNTING
The thermal cutoffs can be mounted by means of soldering, welding and crimping.
Avoid soldering as much as possible. If soldering is unavoidable, the customer must determine the working
conditions and the conditions must be met in the actual process. Make sure it is properly managed.
（ １ ） Lead wires which are fixed to a case body by epoxy resin will gradually be softened and dieteriorated inmechanical strength on account of the heat of soldering and welding. Pay attention that there will be no force
of tension, down pressure, torsion, etc. because it will cause failures like a disconnection.
（ ２ ） When forming a secondary processing after soldering and welding, leave it for more than 30 seconds until theresin completely cools down.
（ ３ ） Please refer to the values in the table below as they are indicative of the soldering time. Soldering is done at
20mm from the edge of the case, at 300℃, with 60% Sn in the solder bath Soldering is done using thefollowing. The information in this table should be used as a guide to help you determine the conditions for yourwork.
（ ４ ） When it is desired to use shorter lead wires, soldering time shall be reduced and radiator shall be usedperforming soldering work in order to increase radiation effect and reduce the effect of soldering heat tothermal cutoff.
Functioning Tem p erature
Under 119℃
Over 124℃

Soldering time
Within 2 seconds
Within 3 seconds（ ５ ） In case of crimping and connecting lead wires, use the most suitable tools to prevent from contact resistance.
（ ６ ） In case of bending lead wires, check the hold with pliers will be fixed at more than 5mm distance from theresin of the body and there will be no force on the resin portion. Make sure not to hold the case body with atool. The following shows the mechanical data of the case body:
Acceptable tensile force
Acceptable thrust force
5FTF-1,2,3,4
FTF-S
5.7N(1.3lbf) 15.7N(3.6lbf) 1N=0.102kgf
1.4N(0.3lbf)
3.9N(0.9lbf) 1lbf=0.45kgf

OTHERS・ Thermal cutoffs do not function as current fuses.
・ Check the thermal cutoff at the time of reception. Since the thermal cutoff actuates even in no loading.
Condition when its ambient temperature gets higher enough for opening, it would be damaged due to an accident
during transportation.
・ As for the FTF-S series, lead wire A and the case are silver plated, which may cause discoloration of the surface.
A special inner bag is used for the FTF-S series, however, if the product is to be stored
in a cardboard box or any other place where sulfur content is likely to be generated, it isP.12
recommended that the product be double-wrapped in a plastic bag, etc. to make sure it
is completely sealed.
・ Measuring variation in the resistance before and after mounting and using of X-ray
device will enable more secure product control.