– 381 –
Thermal Cutoffs (TCO)
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Insulating
case (Ceramic)
Sealant
(Epoxy resin)
Lead wire
(Tin plating copper)
Special resin
(Flux)
Fusible alloy
(Pb·Cd free)
Sealant (Epoxy resin) Fusible alloy (Pb·Cd free)
Special formed
lead wire
(Tin plating copper)
Special resin
(Flux)
Insulating
case(Ceramic)
Insulating film
Terminal (Ni or Ni plating)
Special resin (Flux)
Fusible alloy (Pb·Cd free)
Thermal Cutoffs (TCO)/
Thermal-links
EYP Series: N
Series: F
Series: E
Series: H
Series: MP
Series: MU
● Radial lead type (H series)
■Recommended Applications
● Transformers, Solenoids, Ventilation fans, Electric
fans, Small electric motors, Driers, Gas home appliances,
Fluorescent lights, Electric shavers, Adaptors, Heating
devices, ICs, Batteries, etc. The TCO can also be used
for overheating protection.
■Construction
● Axial lead type (N, F and E series)
● Thin type (MP and MU series)
■Features
● Small and Insulation Type
TCO is compact and insulated, featuring quick temperature response, and mountable in a small space without
insulation or protection.
● High Reliability
TCO opens reliably when the equipment becomes abnormal, and is not resettable.
● Solid Structure
Unique formed lead provides reliable TCO connection and provides easy assembly handling. (Axial lead type only)
● Thin Type
Thick is less than 0.8 mm (MP series), available for spot welding (MP and MU series)
● Halogen-free (Thin type MP and MU series)
The thin type fuses with a part number listed in this catalog contain no halogen other than any that may exist as
an impurity.
■Approved Safety Standards
● PS
E (Japan) : Approved by JET
● UL, C-UL (U.S.A.) : E60271
● CSA (Canada) : 1 (LR67163)
● VDE (Germany) : 481106-1171-
● BEAB (U.K.) : C
● CCC (China) : 20020102050042
See Ratings in details.
✽ Thin type is not to be soldered.
Sep. 201000
– 382 –
Thermal Cutoffs (TCO)
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Note: (1) For long lead types add the letter “L” at the end op the part number.
(2) The information of the Approved Safety Standards is furnished as of Jun. 2010.
Approved Safety Standards File No. UL:E60271, CSA:1687496(LR67163), VDE:481106-1171-0001, BEAB:C1144, CCC:2002010205004249
● F series
■Ratings
● N series
Part No.
Type No. of
Approved
Standards
Rated
Functioning
Temp. : Tf✽
1
(°C)
Functioning
Temp. ✽2
(°C)
Electrical Rating Maximum
Operating
Temp. ✽3
(°C)
Holding
Temp. : Th✽4
(°C)
Maximum
Temp.
Limit : Tm✽5
(°C)
Approved Safety
Standards
AC/
DC
Volt.
(V)
Amp.
(A)
PS
EUL CSA VDE BEAB CCC
EYP2BN082 N082 86 82±2
AC 250 2 60 60
200
AC 125 3 52 56 — —
DC 50 4 45 50 — —
EYP2BN099 N099 102 98+4
AC 250 2 65 75
200
AC 125 3 60 70 — —
DC 50 4 55 65 — —
EYP2BN109 N109 114 110 ± 3
AC 250 2 80 90
200
AC 125 3 76 86 — —
DC 50 5 65 74 — —
EYP2BN110 N110 115 110+3
AC 250 2 80 90
200
AC 125 3 76 86 — —
DC 50 5 65 74 — —
EYP2BN127 N127 134 129±4
AC 250 2 90 100
200
AC 125 3 75 90 — —
DC 50 4 65 80 — —
EYP2BN134 N134 139 135±3
AC 250 2 100 110
200
AC 125 3 85 100 — —
DC 50 6 60 70 — —
EYP2BN143 N143 145 141±2
AC 250 2 110 120
200
AC 125 3 105 115 — —
DC 50 6 80 90 — —
–2
–3
Note: (1) For long lead types add the letter “L” at the end op the part number.
(2) The information of the Approved Safety Standards is furnished as of Jun. 2010.
Approved Safety Standards File No. UL/C-UL:E60271, CSA:1709436(LR67163), VDE:481106-1171-0003, BEAB:C1133, CCC:2002010205004248
Part No.
Type No. of
Approved
Standards
Rated
Functioning
Temp. : Tf✽
1
(°C)
Functioning
Temp. ✽2
(°C)
Electrical Rating Maximum
Operating
Temp. ✽3
(°C)
Holding
Temp. : Th✽4
(°C)
Maximum
Temp.
Limit : Tm✽5
(°C)
Approved Safety
Standards
AC/
DC
Volt.
(V)
Amp.
(A)
PS
E
UL
C-UL CSA VDE BEAB CCC
EYP1BF101 F101 102 98±3
AC 250 1 65 75
200
AC 125 2 60 70 — —
DC 50 3.5 55 65 — —
EYP1BF115 F115 115 110+3
AC 250 1 80 90
200
AC 125 2 76 90 — —
DC 50 4 70 80 — —
EYP1BF134 F134 134 129+4
AC 250 1 90 105
200
AC 125 2 85 100 — —
DC 50 4 65 80 — —
EYP1BF138 F138 139 135±3
AC 250 1 100 110
200
AC 125 2 90 105 — —
DC 50 5 65 70 — —
EYP1BF145 F145 145 141±2
AC 250 1 110 125
200
AC 125 2 110 125 — —
DC 50 5 80 95 — —
–3
–2
Sep. 201000
– 383 –
Thermal Cutoffs (TCO)
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
● E series
● H series
Part No.
Type No. of
Approved
Standards
Rated
Functioning
Temp. : Tf✽
1
(°C)
Functioning
Temp. ✽2
(°C)
Electrical Rating Maximum
Operating
Temp. ✽3
(°C)
Holding
Temp. : Th✽4
(°C)
Maximum
Temp.
Limit : Tm✽5
(°C)
Approved Safety
Standards
AC/
DC
Volt.
(V)
Amp.
(A)
PS
E
UL
C-UL CSA VDE BEAB CCC
EYP05BE101 E101 102 98±3
AC 250 0.5 65 75
200
AC 125 1.5 60 70 — —
DC 50 3 55 65 — —
EYP05BE115 E115 115 110±2
AC 250 0.5 80 95
200
AC 125 1.5 76 93 — —
DC 50 3 70 84 — —
EYP05BE134 E134 134 129+4
AC 250 0.5 90 105
200
AC 125 1.5 85 100 — —
DC 50 3 70 85 — —
EYP05BE138 E138 139 135±3
AC 250 0.5 100 115
200
AC 125 1.5 95 110 — —
DC 50 4 65 80 — —
EYP05BE145 E145 145 141±2
AC 250 0.5 110 125
200
AC 125 1.5 105 125 — —
DC 50 5 80 95 — —
–3
Part No.
Type No. of
Approved
Standards
Rated
Functioning
Temp. : Tf✽
1
(°C)
Functioning
Temp. ✽2
(°C)
Electrical Rating Maximum
Operating
Temp. ✽3
(°C)
Holding
Temp. : Th✽4
(°C)
Maximum
Temp.
Limit : Tm✽5
(°C)
Approved Safety
Standards
AC/
DC
Volt.
(V)
Amp.
(A)
PS
E
UL
C-UL CSA VDE BEAB CCC
EYP2BH101 H101 102 98±3
AC 250 2 65 75
200
AC 125 3 60 70 — —
DC 50 3.5 55 65 — —
EYP2BH115 H115 115 110±2
AC 250 2 80 90
200
AC 125 3 76 86 — —
DC 50 3.5 74 84 — —
EYP2BH134 H134 134 129+4
AC 250 2 90 95
200
AC 125 3 70 85 — —
DC 50 3.5 65 80 — —
EYP2BH138 H138 139 135±3
AC 250 2 100 105
200
AC 125 3 80 95 — —
DC 50 3.5 75 90 — —
EYP2BH145 H145 145 141±2
AC 250 2 110 125
200
AC 125 3 100 115 — —
DC 50 4.5 85 100 — —
–3
Note: (1) For long lead types add the letter “L” at the end op the part number.
(2) The information of the Approved Safety Standards is furnished as of Jun. 2010.
Approved Safety Standards File No. UL/C-UL:E60271, CSA:1709439(LR67163), VDE:481106-1171- 0002, BEAB:C1139, CCC:2002010205004246
Note: (1) The information of the Approved Safety Standards is furnished as of Jun. 2010.
Approved Safety Standards File No. UL/C-UL:E60271, CSA:1709435(LR67163), VDE:481106-1171-0004, BEAB:C1140, CCC:2002010205004245
Sep. 201000
Thermal Cutoffs (TCO)
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
✽1 Rated Functioning Temperature (Tf)
The temperature at which a TCO changes its state of conductivity to open circuit with loading detection current only.
Tolerance; PS
E ; ±7 °C
UL,CSA,VDE, BEAB, CCC; –10 °C
✽2 Functioning Temperature (Fusing-off temperature)
The functioning temperature at which a TCO changes its state of conductivity to open circuit in the ambient air oven which increases
temperature by 1 °C per minute and with loading the detective current 0.1 A or less.
✽3 Maximum Operating Temperature.
The maximum temperature at which a TCO can be maintained while conducting rated current for 1000 h.
For details please refer to specifi cation.
✽4 Holding Temperature (Th)
The maximum temperature at which a TCO can be maintained while conducting rated current for 168 h which will not cause a change in
state of conductivity to open circuit.
✽5 Maximum Temperature Limit (Tm)
The maximum temperature at which a TCO can maintains its mechanical and electrical properties with out closing again for 10
minutes after a TCO has changed its state of conductivity.
0
● MU series
Note: (1) The information of the Approved Safety Standards is furnished as of Jun. 2010.
Approved Safety Standards File No. UL:E60271
● MP series
Note: (1) The information of the Approved Safety Standards is furnished as of Jun. 2010.
Approved Safety Standards File No. UL:E60271
Part No.
Rated
Functioning
Temp. : Tf✽
1
(°C)
Functioning
Temp. ✽2
(°C)
Electrical Rating Maximum
Operating
Temp. ✽3
(°C)
Holding
Temp. : Th✽4
(°C)
Maximum
Temp.
Limit : Tm✽5
(°C)
Approved
Safety
Standards
AC/
DC
Volt.
(V)
Amp.
(A) UL
EYP2MP092AFT 92 88+3 DC 32 2 55 60 135
EYP2MP098AFT 98 94+3 DC 32 2 60 65 135
–4
–2.5
Part No.
Rated
Functioning
Temp. : Tf✽
1
(°C)
Functioning
Temp. ✽2
(°C)
Electrical Rating Maximum
Operating
Temp. ✽3
(°C)
Holding
Temp. : Th✽4
(°C)
Maximum
Temp.
Limit : Tm✽5
(°C)
Approved
Safety
Standards
AC/
DC
Volt.
(V)
Amp.
(A) UL
EYP4MU092GFD 92 89+3 DC 32 4 55 55 135
–4
Sep. 2010
– 385 –
Thermal Cutoffs (TCO)
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
A
φd
B L
C
lLl
φD
φd
φ
D1
DG (H)
A
EB
JC
D(G) (H)
A
ENB
JC
■ Marking
The following items are indicated on TCO.
• N, F, E, H Series : Type No., Date Code, Trade Mark, <PS>E Mark, JET, Rated Functioning Temperature, Rated Current
• MP, MU Series : Type No., Date Code, Trade Mark
■Packaging Methods
Part No. Standard Quantity Style Mass (Weight) [mg/pc.]
EYP2BN 2000 pcs./Box
Bulk
340
EYP2BNL2000 pcs./Box 510
EYP1BF 3000 pcs./Box 220
EYP1BFL4000 pcs./Box 330
EYP05BE 4000 pcs./Box 210
EYP05BEL5000 pcs./Box 320
EYP2BH 1500 pcs./Box 350
EYP2MPAFT 2000 pcs./Box 54
EYP4MUGFD 1000 pcs./Box 130
● Radial lead type
■Dimensions in mm (not to scale)
● Axial lead type
● Thin type
(✽) For long lead types add the letter “L” at the end op the part number.
Dimensions (mm)
LφDφD1 kφd
N Series 9.0±1.0 2.5±0.2 3 max. 38±3 (✽78±3) 0.60±0.05
F Series 6.0±1.0 1.85+0.20 2.2 max. 38±3 (✽68±3) 0.53±0.02
E Series 5.0±0.5 1.5±0.1 1.8 max. 38±3 (✽68±3) 0.53±0.02
–0.15
Dimensions (mm)
ABCL φd
H Series 5.0±0.5 4.0±0.5 2.2±0.3 55±3 0.53±0.02
EYP4MUGFD
Dimensions (mm)
ABCDEG(H) J N
EYP2MPAFT 24.5±0.5 2.7±0.2 0.64±0.15 4.2±0.5 2.3±0.2 7.9±0.5 (12.4) 0.10±0.02 –
EYP4MUGFD 26.5±0.5 4.5±0.4 1.00±0.15 10.5±0.5 3.0±0.2 (8.0) (8.0) 0.15±0.02 1.8±0.5
EYP2MPAFT
Sep. 201000
– 386 –
Thermal Cutoffs (TCO)
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
The following are precautions for individual products. Please also refer to the common precautions shown on page 4 of
this catalog.
● Design Applications
1. Use the TCO within their specifi ed temperature and electrical ratings.
1) Use the TCO under the maximum operating temperature specifi ed in the individual specifi cation.
Using the TCO under a higher temperature than the maximum operating temperature may cause premature
open ing or opening delay.
• When the TCO is continuously used at the temperature close to the functioning temperature, the TCO may
op er ate while being used.
• When the TCO is continuously used at the temperature higher than the maximum operation temperature, the
TCO may be degraded and may not operate normally at the specifi ed temperature.
2) The holding temperature is defi ned as the highest temperature at which the TCO is activated continuously at
the rated current for 168 hours. The TCO can not be used over 168 hours exceeding the holding temperature.
3) Equipment should be designed so that its over shoot does not exceed the maximum temperature limit after
the TCO operates.
4) If the TCO is activated by voltage higher than the rated voltage or current higher than the rated current, the
TCO produces excessive heat, resulting in premature opening. The arc generated at this condition of operation
will result in an abnormality of appearance (crack on body) and insuffi cient insulation.
• When TCO is operated in an abnormal mode while the rated voltage and/or the rated current being
exceeded, it may not cut off the circuit .
5) Thermal element may be transformed and TCO may open when it is used in the environment from which an
excessive temperature change (such as outdoor) is repeated. Investigate the environment where TCO is used.
6) Where transient overload is expected to be applied, repeat the tests under the worst conditions.
7) The TCO cannot be used as a current sensitive fuse.
2. To fully use the function of the TCO, a suitable TCO for each equipment application must be selected.
1) Tests should be repeated for the fi nished equipment to confi rm that the TCO does operate as expected.
2) To improve thermal response of the TCO, put the main body of the TCO and the lead wires(terminals) as
close to the heat source as possible and the place where the TCO is evenly heated.
If the temperatures transferred to the main body and to the lead wires(terminals) are largely different from
each other, improper operation can be expected, causing arcing and deterioration of insulation.
3. Avoid application of excessive vibration and mechanical stress to the TCO. Otherwise, failure of the fusible
alloy or lead wires, or damage to the main body may result.
4. The following 1) and 2) are precautions for thin type TCO (MP and MU series)
1) TCO body and terminals must be properly fi xed when the TCO is mounted in the equipment. It may cause
breaking of thermal element and/or terminals, or damages of the TCO body, or other failure when the body or
terminals is not properly connected. Avoid a transport under the condition with a connection only a single side
of terminal and the equipment as it might cause breaking of thermal element and/or terminals, or damages of
the TCO body, or other failure due to the vibration or mechanical stress on the transportation.
2) When TCO is mounted in the equipment, terminals must be aligned with the body. If TCO body and terminals
are mutually mounted askew, it might cause breaking of thermal element and/or terminals. Also after assembling
TCO in the equipment, avoid pulling, bending, pushing stress and twisting stress in the TCO body and terminals
in order not to cause breaking of thermal element and/or terminals, or damages of the TCO body.
5. When sealing the TCO with resin, select a resin that does not corrode the seals or the lead wires(terminals).
When sealing the overall TCO with resin, determine the fi xing conditions by repeating the test using your fi nal
product to check whether or not the resin properties (e.g. expansion, contraction, and curing temperature)
affect the TCO and whether or not the TCO can operate normally.
6. When immersing equipment with a TCO in varnish or solvent and then drying it, repeat the test to check whether
or not the varnish or solvent used dissolved the coating of the TCO or caused damage, such as cracks, before
performing the treatment again.
7. Do not use under the following environments.
1) In liquids such as water, oil, chemical and organic solvents
2) In direct sunlight, outdoors or in dusty atmospheres
3) In places where water condensation occurs
✽ Use in the following environments may affect the performance of the TCO; Verify performance and reliability
be fore production use.
(1) In places full of corrosive gases such as sea breeze, Cl2, H2S, NH3, SO2 and NO2
(2) In environments with high static electricity and/or strong electromagnetic waves.
8. Do not use the TCO in aerospace equipment, atomic energy equipment, military weap ons, life saving
equip ment, etc.
● Instruction
1. Forming and Cutting
1) Lead wires(terminals) are to be bent or cut at least 3 mm away from the TCO seals to avoid damaging the
TCO . (axial / radial type) or body (thin type). The TCO seals (axial / radial type) shall not be grasped with
any tools or holders. Terminals of thin type TCO are to be grasped before they are bent . (See Fig.1)
2) The lead wires and terminals shall not be nicked, fractured or burned.
The body and/or seals must not be damaged, burned or overheated.
3) It is recommended that experimental assembly trials, should be done so that it can be verifi ed that manufacturing
procedures will not exceed the maximum tested "pull" and "push" forces of 20 N (MP series:5 N, MU series:10 N)
and 5 N respectively on the lead wires (terminals), or induce excessive twisting or the like.
4) Do not repeat bending terminals of thin type TCO.
Safety Precautions (Handling Precautions)
Sep. 201000
– 387 –
Thermal Cutoffs (TCO)
Design and specifi cations are each subject to change without notice. Ask factory for the current technical specifi cations before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
l
l
● Soldering point
>3mm >3mm >3mm >3mm
>3mm >3mm
grasped grasped
Bending Cutting
Fig-1
2. Soldering, Welding, Calking
1) Lead wires are to be soldered with the standard conditions shown in Table 1.
Excessive soldering heat and soldering time may cause damage to a TCO.
If higher temperature, longer time or shorter lead length exist rather than the conditions of Table 1 ,it is
recommended to run tests for fi nd ing the soldering conditions that do not damage the TCO. Also, use of
tools such as pliers are recommend ed to dissipate the soldering heat by grasping lead wires between the
TCO body and soldering point.
2) Avoid preheating and gradual cooling as much as possible. However if preheating and gradual cooling is
done, set the process conditions after confi rming that the TCO is not affected by these procedures.
3) Do not use refl ow soldering.
4) Thin type (MP and MU series) is not to be soldered.
5) If water or solvent is used for cleaning fl ux after soldering, check and confi rm the reliability of the agent.
6) Lead wires are to be clamped at least 3 mm away from the seals.
Improper connections may cause damage to the seals or other parts and may result in nuisance tripping of
the devices due to the generation of excessive heat at a faulty high resistance junction.
7) Set the conditions for welding and calking only after checking contact resistance and connection strength.
8) When resoldering or rewelding, cool the TCO under room conditions.
9) When the TCO is heated by soldering or welding, be careful not to pull, push or twist the TCO lead wires.
Ta b le-1 Soldering Conditions
3. The use of suffi ciently fl exible, appropriate free length and proper size wire should be used for splice connection.
Connection including connectors used for splicing shall be of the low resistance type, and they shall be made
mechanically secure.
4. Where the lead wires of the TCO is tied with string, put them at least 10 mm apart from the seals of the main
body of the TCO.
5. Quality control notes.
1) Measurement of resistance between lead wires (terminals) and checking of the internal status with X-rays are
effective means to confi rm the status of the TCO on delivery and after mounting in the equipment.
6. Storage method
1) Store the TCO in packing cases or in polyethylene bags within the temperature range -10 °C to +40 °C and
RH of 30 % to 75 %. Store them at a location where no rapid changes of temperature or humidity or no
direct sunlight is applied. The location must also be free from vibration and shock .
2) Avoid storage in places containing corrosive gases such as sea breeze, Cl2, H2S, NH3, SO2 and NO2.
3) The period of guarantee for performance such as solderability is for one year after our delivery; and this
condition applies only in the case where the storage method specifi ed in above has been followed.
7. Do not repair a TCO. Replace it with a new part.
Temperature of Soldering: 300 °C Time: 3 s
Lead Length (k)Type No.
30 mm F101 E101 H101
25 mm N082, N099
E115, E134, E138 H115, H134, H138
20 mm N109, N110 F115, F134,
F138, F145 E145 H145
15 mm
N127, N134, N143
Sep. 201000
