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SEFUSE
TM
THERMAL CUTOFF
8th Edition
Cutaway View of SEFUSETM
SF Type
SF Type
SEFUSE
Contents
TM
Introduction ..................................................................................................................................... 4 Features ............................................................................................................................................ 4 Applications ..................................................................................................................................... 4 Product Types .................................................................................................................................. 5 Operating Principle ......................................................................................................................... 6 Drawings, Dimensions and Marking ............................................................................................. 7 Standard Ratings ............................................................................................................................. 8 Performance Data .......................................................................................................................... 11 Lead Cutting and Taping ............................................................................................................... 15 Cautions ......................................................................................................................................... 16 Application Examples ................................................................................................................... 21
Series SF / E SF / Y SM / A SM / B SM / G
Rated Current 10 Aa.c. 15 Aa.c. 2 Aa.c. 1 Aa.c. 0.5 Aa.c.
Rated Functioning Temperature 73 C to 240 C 73 C to 24C C 70 C to 187 C 100 C to 150 C 100 C to 150 C
Page 8 8 9 9 9
Select optimum series according to temperature and electrical ratings.
Please be sure to read the "Cautions" on pages 16 through 19 before using.
3
Introduction
NEC's SEFUSETM is a compact and reliable thermal cutoff designed to protect domestic electrical appliances and industrial electrical equipment from fire. Cutoff occurs and an electrical circuit opens when ambient temperature increases to an abnormal level. Two NEC SEFUSE types are available. The SF type uses an organic thermosensitive material as the thermal pellet and its operating temperature range is 73 C to 240 C. The SM type uses a fusible alloy and has an operating range of 70 C to 187 C. SEFUSE is manufactured in Japan and thailand, and both factories are ceritified by the International Standards Organization (lSO) for the ISO9001 quality standard. The factory in Japan is certified for the ISO 14001 environmental management system too.
Features
q q q q q q
Compact, durable, and reliable by resin-sealed construction One shot operation Excellently sensitive to abnomal temperature rise and high accuracy in operation Stable and precise operation Wide choice of types to suit the application (SF or SM) Meets many international safety standards
Applications
q q
Electric heaters, electric irons, hair dryers, electric blankets Air conditioners, compressors, washing machines, electric fans, ventilation fans, electric pencil sharpeners, electric sewing machines, copy machines, various motors Color televisions, LCD televisions, stereo equipment, Iamps, fluorescent lamps, electric shavers, video and audio cassette recorders, various transformers, AC adaptor, charger, Battery packs Rice cookers, microwave ovens, electric refrigerators, electric water pots, toasters, electric pans, coffee makers, juicers, dish dryers Gas boilers, gas heaters, oil heaters, cameras, telephone switching (PBX) equipment
q
q
q
Safety standards
Japan
Electrical Appliance and Material Control Law of Japan
UL
Underwriters Laboratories Inc. (U. S. A.)
CSA
Canadian Standards Association
VDE
Verband Deutscher Elektrotechniker e.V. (F. R. G.)
BEAB
British Electrotechnical Approvals Board
4
SEFUSE
TM
Product Types
The SF type uses an organic thermosensitive pellet inside a metal case. It features a large cutoff (rated) current of 10 A or 15 A. The SM type uses a fusible alloy inside a ceramic case. It has a cutoff(rated)current of 0.5 A, 1 A or 2 A. Because of its insulated case, the SM type can be attached directly where temperature detection is required.
q
SF Type
q
SM Type
5
Operating Principle
SF Type
THE SF type contains a sliding contact, springs, and a thermal pellet inside a metal case. When spring B is compressed, firm contact between lead A and the sliding contact occurs. This presses two disks against the sliding contact and the thermal pellet. At normal temperatures, current flows from lead A to the sliding contact and then through the metal case to lead B. When the ambient temperature rises to the SEFUSE operating temperature, the heat transferred through the metal case melts the thermal pellet. When the thermal pellet melts, springs A and B expand, moving the disk and sliding the contact away from lead A. The electrical circuit is opened by breaking contact between the sliding contact and lead A.
q
Before Operation
Ceramic Sealing Compound Spring B
q
After Operation
Metal Case Spring B
Lead A Ceramic Pipe Spring A Sliding Contact
,, ,,
Thermal Pellet Lead B
Disks
Metal Case Spring A
,,, ,,,
Sliding Contact Disks
Thermal Pellet
SM Type
In the SM type, Ieads A and B are connected by a conductive thermal pellet (fusible alloy). The current flows directly from one lead to the other. The fusible alloy is coated with a special flux. When ambient temperature rises to the SEFUSE operating temperature, the fusible alloy melts and condenses into a drop around the end of each lead because of surface tension and the coating of special flux. The electrical circuit then opens.
q
Before Operation
Sealing Compound Ceramic Case
q
After Operation
Fusible Alloy
Lead
Lead Lead
Flux
6
,
,,,
Fusible Alloy
Sealing Compound
,
Lead
Flux
SEFUSE
TM
Drawings Dimensions, and Marking
SF Type
q
SF/E Series
4.2 1.0
Unit : mm
1.0
q
MARKING
Factory Code MITI Approved Mark
SEFUSE SF139E T f 1 4 2C 10A 250V ~
Brand Name Part Number Production Control No. Rated Functioning Temperature Rated Current Rated Voltage
20(35)
11 66(81)
35
Factory Code represents the factory location as shown below. Japan : none, Thailand : B q
SF/Y Series
4.2 1.3
Unit : mm
1.3
q
MARKING
SEFUSE SF139Y
Maker Mark MITI Approved Mark
Brand Name Part Number Production Control No. Rated Functioning Temperature Rated Current Rated Voltage
20(35)
11 66(81)
35
139C 15A 250V
Note: The dimensions for long lead devices are in parentheses.
SM Type
q
SM/A, SM/B Series
0.6 2.5
Unit : mm
0.6
q
MARKING
38(68)
9 85(145)
38(68)
SEFUSE SM126A0
Brand Name Part Number Production Control No. Rated Functioning Temperature Rated Voltage
SM/A
0.53 2.0 0.53
MITI Approved Mark Rated Current
T f 1 3 1 C 2A 250V ~
39.5(69.5)
6 85(145)
39.5(69.5)
SM/B
q
SM/G Series
0.53 1.6 0.53
q
MARKING
MITI Approved Mark
SEFUSE 110 G0
Brand Name Part Number Rated Functioning Temperature Rated Voltage
40(70)
5 85(145)
40(70)
Production Control No. Rated Current
Tf 115C 0.5 A 2 5 0 V ~
Note: The dimensions for long lead devices are in parentheses.
7
Standard Ratings
SF Type
q
SF/E Series
Part 1) Rated Functioning Operating Temperature Number Temperature TF, Tf SF 70E 73 C 702 C SF 76E SF 91E SF 96E SF109E SF119E SF129E SF139E SF152E SF169E SF188E SF214E SF226E SF240E 77 C 94 C 99 C 113 C 121 C 133 C 142 C 157 C 172 C 192 C 216 C 227 C 240 C
0 76 2 C 4
TH Th TC 45 C 51 C 66 C 71 C 84 C 94 C 104 C 114 C 127 C 144 C 164 C 189 C 190 C 190 C
TM Tm 150 C 150 C 150 C 150 C 150 C 150 C 159 C 159 C 172 C 189 C 300 C 350 C
2)
Rated Rated Current Voltage
Safety Standard UL CSA VDE
5)
BEAB
made in Japan
made in Thailand
33-312 33-331 33-332
33-835 33-834 33-833 33-832 33-831 33-830 33-886 33-827 33-828
91 2 C 962 C
3 109 2 C 1
3 1
1192 C 1292 C 1392 C 1522 C
1 169 2 C 3 3 188 2 C 1 1 214 2 C 3 1 226 2 C 3
2)
3)
10 A (AC)
250 V (AC)
E71747
LR 52330
6778.2 -1171 -0002 6778.2 -4510 -1008
33-333 C0632 33-334 33-335 33-336 33-549 33-354
4)
2372 C
350 C
Note : 1) Part numbers are for standard lead devices. For long leads, add the number "-1" at the end of part number. 2) The maximum temperature limit of SF226E is partially approved as shown below. TM.Tm SF226E UL 240C CSA 330C VDE 300C BEAB 300C
* Under application to increase to over 300C 3) The additional electrical ratings are recognized by UL and CSA as follows. UL : 277 Vac / 15 Aac (Resistive), 240 Vac / 15 Aac (Resistive), 120 Vac / 15 Aac (Resistive, Inductive) CSA : 250 Vac max. / 15 Aac max. (Resistive, Inductive) 4) SF169E, SF188E, SF214E, SF226E and SF240E are also UL-recognized of optional CH-rating (Conductive Heat Aging Test). 5) The VDE recognized file number had been changed in February 1998. The number in parentheses are previous file number.
q
SF/Y Series
Part Number SF 70Y SF 76Y SF 91Y SF 96Y SF109Y SF119Y SF129Y SF139Y SF152Y SF169Y SF188Y SF214Y SF226Y SF240Y
1)
Rated Functioning Temperature 73 C 77 C 94 C 99 C 113 C 121 C 133 C 142 C 157 C 172 C 192 C 216 C 227 C 240 C
Operating Temperature 70 2 C
0 76 2 C 4 3 91 2 C 1
Rated Current
Rated Voltage
Safety Standard
33-312 33-331 33-332 33-333 15 A (AC) 250 V (AC) 33-334 33-335 33-336 33-549 33-354
96 2 C
3 109 2 C 1
119 2 C 129 2 C 139 2 C 152 2 C
1 169 2 C 3 3 188 2 C 1 1 214 2 C 3 1 226 2 C 3
237 2 C
Note : 1) Part numbers are for standard lead devices. For long leads, add the number "-1" at the end of part number.
8
SEFUSE
TM
SM Type
#) The VDE recognized file number had been changed in February 1998. The number in parentheses are previous file number.
q
SM/A Series
TH Th TC 40 C 65 C 80 C 96 C 100 C 115 C 133 C 152 C TM Tm 80 C 115 C 125 C 140 C 145 C 160 C 180 C 195 C 2A (AC) 250 V (AC) E71747 LR52330 Rated Rated Current Voltage Safety Standard UL CSA VDE
#)
Part 1) Rated Functioning Operating Temperature Number Temperature TF, Tf SM065A0 70 C 65 2 C SM095A0 SM110A0 SM126A0 SM130A0 SM145A0 SM164A0 SM182A0 100 C 115 C 131 C 135 C 150 C 169 C 187 C
5 95 2 C 0
BEAB 33-528 33-466 33-472 C0600 33-467 33-468 33-470 33-556
110 2 C 126 2 C 130 2 C 145 2 C
3 164 2 C 2
6778.2 -1171 -0001
()
6778.2 -4510 -1007
182 2 C
Note : 1) Part numbers are for standard devices. For long leads, change the last number from 0 to 1.
q
SM/B Series
TH Th TC 65 C 80 C 96 C 100 C 115 C TM Tm 115 C 125 C 140 C 145 C 160 C 1A (AC) 250 V (AC) E71747 LR52330 Rated Rated Current Voltage Safety Standard UL CSA VDE
#)
Part 1) Rated Functioning Operating Temperature Number Temperature TF, Tf 5 SM095B0 100 C 952 C 0 SM110B0 SM126B0 SM130B0 SM145B0 115 C 131 C 135 C 150 C 1102 C 1262 C 1302 C 1452 C
BEAB 33-466 33-472 C0557 33-467 33-468
()
Safety Standard UL CSA VDE
#)
6778.2 -1171 -0004 6778.2 -4510 -1009
Note : 1) Part numbers are for standard devices. For long leads, change the last number from 0 to 1. Tm of SM145B for CSA is 155 C
q
SM/G Series
TH Th TC 65 C 80 C 96 C 100 C 115 C TM Tm 115 C 125 C 140 C 145 C 155 C
2) 2)
Part 1) Rated Functioning Operating Temperature Number Temperature TF, Tf 5 SM095G0 100 C 952 C 0 SM110G0 SM126G0 SM130G0 SM145G0 115 C 131 C 135 C 150 C 1102 C 1262 C 1302 C 1452 C
Rated Rated Current Voltage
BEAB 33-466 33-472 C0743 33-467 33-468
0.5 A (AC)
250 V (AC)
E71747 LR52330
()
6778.2 -1171 -0003 6778.2 -4510 -1005
Note : 1) Part numbers are for standard lead devices. For long leads, change the last number from 0 to 1. 2) The additional electrical ratings are recognized by UL as follows. SM095G : DC 50 V / 3 A, SM110G, SM126G, SM130G, SM145G : DC 50 V / 5 A
9
Definition of Terms
q
Rated Functioning Temperature Rated functioning temperature is the operating temperature of thermal cutoffs, measured using the method specified in the safety standard. In present E.A.M.C. (Electrical Appliance and Material Control) Law of Japan, Valid until June 2001, the operation should be within the specified operating temperature range of 7C. In various standards such as UL, CSA, VDE, BEAB and new E.A.M.C. Low of Japan, which comply with the IEC standard, it is called the rated functioning temperature, and should operate within the prescribed temperature range of +0/-10 C. It is represented by the symbol TF in the UL standard, and by the symbol Tf in the CSA, VDE and BEAB and new E.A.M.C. standards. In SEFUSE, a temperature that complies with both standards is set as the rated functioning temperature, and is indicated on the body of the thermal cutoff.
q
Operating Temperature Operating temperature is the actual operating temperature range when the thermal cutoff is made to operate inside a constant temperature oven whose temperature is raised at the rate of 1 C/min. while a detection current of 100 mA or lower is applied. The operating temperature is a standard set by NEC and is not specified by a safety standard.
q
TH, Th, Tc (Holding Temperature) Holding temperature is the maximum temperature at which, when applying a rated current to the thermal cutoff, the state of conductivity is not changed during specified time not hess than 168 hours (1 week). It is represented by the symbol TH in the UL standard, Th in the CSA standard, and Tc in the VDE, BEAB and new E.A.M.C. standards.
q
TM, Tm (Maximum Temperature Limit) Maximum temperature limit is the temperature up to which thermal cutoffs will not change its state of cutoff without impairing. It is represented by the symbol TM in the UL standard and by Tm in the CSA, VDE, BEAB and new E.A.M.C. standards.
q
Rated Current Reted current is the maximum current that thermal cutoffs allow to carry and are able to cutoff the circuit in safety.
q
Rated Voltage Reted voltage is the maximum voltage that is allowed to apply to the circuit in wich the thermal cutoff is used.
10
SEFUSE
TM
Performance Data
SF/E & SF/Y Series
Temperature Rise Response Time
(C) 40
SF/E
Temperature Rise (C)
30
SF/Y
Time for opening after immersion into oil (seconds)
40
30
20
20
10
10
0 5 5 10 15 20
10
20
30
40
Temperature Difference (C) (oil temp. minus operating temp.)
Pass-through Current (A)
Initial Characteristics
SF169E & SF169Y SF139E & SF139Y SF109E & SF109Y SF96E & SF96Y SF70E & SF70Y
Part Number
High Temperature Storage Test
SF169E
169 168 167 140 139 138 112 111 110 97 96 95 71 70 69
Operating Temperature (C)
106 105 104 106 105 104 106 105 104 106 105 104 106 105 104
2.0 1.5 1.0 2.0 1.5 1.0 2.0 1.5 1.0 2.0 1.5 1.0 2.0 1.5 1.0
1.5 1.0 0.5 1.5 1.0 0.5 1.5 1.0 0.5 1.5 1.0 0.5 1.5 1.0 0.5
E Y
+2 0 -2 +2 0 -2 +2 0 -2 +2 0 -2 +2 0 -2
Change of (C)
@140C
& SF169Y SF139E
@119C
E Y
& SF139Y SF109E
@89C
E Y
& SF109Y SF96E
@76C
E Y
& SF96Y SF70E
@50C
E Y
& SF70Y
Insulation Withstand Voltage Resistance after after Operation Operation
(M)
(kV)
Internal Resistance (m/25 mm)
Part Operating Number Temperature
0
10
100
1,000
10,000
Time (Hours)
Note : The values following @ are the storage temperature.
11
SM/A Series
Temperature Rise
(C) 6
Response Time
5
4
Time for opening after immersion into oil (seconds)
Temperature Rise (C)
SM095A0 SM110A0 SM126A0 SM130A0 SM145A0
30
20
3
2
10
1
0 0 1 2
Pass-through Current (A)
,, ,,, ,, ,, ,, ,, , ,,,,,,,, ,,, ,,, ,, ,, ,,,, ,,
SM095A0 SM110A0 SM126A0 SM130A0 SM145A0
10
20
30
40
50
Temperature Difference (C) (oil temp. minus operating temp.)
Initial Characteristics
146
SM145A0
High Temperature Storage Test
3.4 3.0 2.6 4.4 4.0 3.6 4.4 4.0 3.6 4.4 4.0 3.6 11 9 7
Part Number
106 105 104 106 105 104 106 105 104 106 105 104 106 105 104
Insulation
3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0
+5
SM145A0
@125C
145 144 131
0 -5 +5 @110C
SM130A0
130 129 127
SM130A0
0 -5 +5 @106C
SM126A0
126 125 111
SM126A0
0 -5 +5 @90C
SM110A0
110 109 99
SM110A0
0 -5 +5 @75C
SM095A0
98 97
SM095A0
0 -5
Change of Operating Temperature (C)
Part Number
Withstand Voltage Operating Internal Resistance after after Operation Temperature Resistance Operation (kV) (C) (m/25 mm) (M)
0 10
100
1,000
10,000
Time (Hours)
Note : The values following @ are the storage temperature.
12
SEFUSE
TM
SM/B Series
Temperature Rise
10 9 8 Temperature Rise (C) 7 6 5 4 3 2 1
SM095B0 SM110B0,SM126B0,SM130B0 SM145B0
Response Time
30 Time for opening after immersion into oil (seconds)
20
10
0
1
2
3
,, ,,, ,, ,,, , , ,,,,, ,, ,, ,,, , , , ,, ,, , ,
SM095B0 SM110B0 SM125B0 SM130B0 SM145B0
0
10
20
30
40
50
Temperature Difference (C) (oil temp. minus operating temp.)
Pass-through Current (A)
Initial Characteristics
146
SM145B0
High Temperature Storage Test
4.0 3.5 3.0 4.7 4.6 4.5 4.8 4.6 4.4 4.7 4.6 4.5 9.5 9.0 8.0
Part Number
106 105 104 106 105 104 106 105 104 106 105 104 106 105 104
Insulation
3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0
+5
SM145B0
@125C
145 144 130
0 -5 +5 @110C
SM130B0
129 128 127
SM130B0
0 -5 +5 @106C
SM126B0
126 125 112
SM126B0
0 -5 +5 @90C
SM110B0
111 110 98
SM110B0
0 -5 +5 @75C
SM095B0
97 96
SM095B0
0 -5
Change of Operating Temperature (C)
Part Number
Withstand Voltage Operating Internal Resistance after after Operation Temperature Resistance Operation (kV) (C) (m/25 mm) (M)
0 10
100
1,000
10,000
Time (Hours)
Note : The values following @ are the storage temperature.
13
SM/G Series
Temperature Rise Response Time
10
Temperature Rise (C)
SM095G0 SM110G0 SM125G0 SM130G0 SM145G0
5
0
1
2
3
Pass-through Current (A)
,,,,,, ,, , ,, ,, , , ,,,,,,,,,, , ,, , , ,, ,,,, ,,, ,, , , ,, , ,, ,,
30 20
SM095G0 SM110G0 SM126G0 SM130G0 SM145G0
Time for opening after immersion into oil (seconds)
10
0
10
20
30
Temperature Difference (C) (oil temp. minus operating temp.)
Initial Characteristics
146
SM145G0
High Temperature Storage Test
5.0 4.0 3.0 6.0 5.0 4.0 6.0 5.0 4.0 6.0 5.0 4.0 13.0 11.0 9.0
Part Number
106 105 104 106 105 104 106 105 104 106 105 104 106 105 104
Insulation
3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0 3.0 2.0 1.0
+5
SM145G0
@125C
145 144 131
0 -5 +5 @110C
SM130G0
130 129 127
SM130G0
0 -5 +5 @106C
SM126G0
126 125 112
SM126G0
0 -5 +5 @90C
SM110G0
111 110 99
SM110G0
0 -5 +5 @75C
SM095G0
98 97
SM095G0
0 -5
Change of Operating Temperature (C)
Part Number
Withstand Voltage Operating Internal Resistance after after Operation Temperature Resistance Operation (kV) (C) (m/25 mm) (M)
0 10
100
1,000
10,000
Time (Hours)
Note : The values following @ are the storage temperature.
14
SEFUSE
TM
Lead Cutting and Taping
NEC will perform lead cutting or taping as requested by customers.
K
Applicable Products
q
SF type : SF E (only for lead cutting), SF E-1 Does not apply to the SF/Y series. SM type : SM A0, SM B0, SM G0 (short lead type)
q
K
Taping
reel
R R P
30
89
t L1 S T W L2 T
S
SF type: 2000 pcs/reel SM type: 2500 pcs/reel
(75)
(Unit : mm) W P L1- L2 522 632 50.5 2.0 672 T 61 Z 2.0 R 0.5 t 3.2 S 0.8
K
Lead Cutting
q
SF Type
L1 : 7 to 30 L2 : 7 to 33 (mm)
L1 L2
q
SM Type
L1, L2 : 7 to 33 (mm)
L1 L2
For more information on dimensions not described in diagrams above, please call NEC.
285
75
Z
15
Cautions
This section describes cautions designed to protect the performance of the thermal cutoff. Be sure to read and fully understand these cautions. To obtain full performance from the thermal cutoff, it is necessary for the customer to appropriately store the thermal cutoff, design appropriate circuits for the application, and perform evaluations, mounting and testing as necessary. Problems arising from the inappropriate execution of the above are the responsibility of the customer, and NEC declines any and all responsibility.
Design Cautions
q
Do not use this device for and purpose other than as a thermal cutoff. The thermal cutoff is designed to detect abnormal rises in temperature and break circuits if needed. It is not a current fuse that cuts excess current. If used as a current fuse, the SEFUSE may malfunction.
q
Do not use this device in aerospace equipment, aeronautical equipment, nuclear reactor control systems, Iife support equipment or systems, transportation machinery engine control or safetyrelated equipment. This device is designed for use in household electric appliance, office automation equipment, audio and video equipment, computer communications equipment, test and measurement equipment, personal electronic equipment and transportation equipment (excluding engine control).
q
The customer should select the proper thermal cutoff device, mounting location, and mounting method as appropriate for each application. Verify whether the chosen selections are appropriate by repeatedly testing the final design for thermal cutoff under normal conditions as well as under predicted maximum abnormal conditions.
q
Make designs so that the temperature of the body of the thermal cutoff does not exceed the temperatures shown in Table 1. If, the temperature is exceeded on a regular basis, the thermal cutoff may start operating only at temperature lower than the normal operating temperature. Malfunctions may also occur. Even if the thermal cutoff's operating temperature is exceeded, it may malfunction.
16
SEFUSE
SM Type Type SM065A SM095A, B, G SM110A, B, G SM126A. B. G SM130A, B, G SM145A, B, G SM164A SM182A Body Temperature 45 C 75 C 90 C 106 C 110 C 125 C 140 C 140 C Type SF 70E, Y SF 76E, Y SF 91E, Y SF 96E, Y SF109E, Y SF119E, Y SF129E, Y SF139E, Y SF152E, Y SF169E, Y SF188E, Y SF214E, Y SF226E, Y SF240E, Y Table 1 SF Type Body Temperature 50 C 56 C 71 C 76 C 89 C 99 C 109 C 119 C 132 C 140 C 140 C 140 C 140 C 140 C
TM
q
The body temperature of the thermal cutoff becomes higher as current passes through and might rise higher than the ambient operating temperature (see test data). The temperature may rise even higher depending on the mounting method and other conditions. Therefore, after mounting the thermal cutoff under the same conditions you would use for the actual application, work the final product and measure the body temperature of the thermal cutoff.
q
Use the thermal cutoff with a voltage and current level lower than the rated level. If the thermal cutoff is used with a voltage or current level higher than the rated level, contacts may melt in the SF type, causing the fuse to malfunction. In the SM type, the body of the thermal cutoff may be destroyed.
q
Do not use the thermal cutoff in water, organic solvents or other liquids, or environments containing sulfurous acid gas, nitrous acid gas, or high humidity. Doing so will cause deterioration of the sealing resin, the thermal cutoff may operate at lower than operating temperature, or any other malfunctions may occur. Also, the thermal cutoff may not operate even if its operating temperature is exceeded.
17
Lead wire process
q
When bending the lead wire, in order to protect the resin seal from excessive pressure, secure the lead wire cIose to the case and bend the part beyond the secured section.
3 mmor more
,,, ,,,
,,,,, ,,
Secured
The lead wire should be bent at a distance 3 mm or more from the body of the fuse, and should not be twisted.
q
The tensile strength applied to the lead wire should be 5 kg or less for the SF type, and 1 kg or less for the SM type.
q
The strength applied to the body of the thermal cutoff should be 10 kg or less for the SF type, and 5 kg or less for the SM type.
SF(10 kgf) SM(5 kgf)
In the case of an SF type, deformation of the case may change the location of the moving electrode during operation and may cause the thermal cutoff to operate only at temperatures lower than the normal operating temperature range. The thermal cutoff also may not operate even if the thermal cutoff's operating temperature is exceeded. Mounting SEFUSE can be mounted by soldering, caulking, or welding.
q
If soldering, note that the thermal cutoff may not function because of excessive solder temperature. To prevent such malfunctions, for example, holding the lead new the case by a tool is effective for allowing the heat to escape, and the soldering should be done in short interval. Another effective method is to use a lower solder temperature and to solder at a location that is distant from the case.
q
If caulking or welding, be careful to keep the resistance value of the connecting section low. If the connecting section has a high resistance value, the passing current may generate an abnormally high temperature that will cause the thermal cutoff to operate (break the circuit).
18
,,,,, ,,
Secured
,,, ,,,
0.8 steel wire
SEFUSE
q
TM
It is recommended that the connecting position at the lead of resign-sealed side should be 5 mm or more from the body of the thermal cutoff.
5 mm or more
Connecting Position
5 mm or more
5 mm or more
Connecting Position
q
After mounting the thermal cutoff, be careful not to apply force that may pull, push or twist the lead wires.
q
If using an SF type thermal cutoff, be sure not to make the lead on the resin-sealed side touch the case. This would cause the current to flow from the lead on the resin-sealed side to the opposite lead so that the thermal cutoff cannot break the circuit. Note that the body of the SF type is the same in potential as the circuit. Therefore, it must be electrically isolated from the other metalic part.
Storage
q
The body and lead A of SF type, and the leads of SM164A and SM182A are silver-plated. Therefore, these parts may discolor because of sulfuration. In the case, the marking of the body wiII become difficult to discriminate or the solder-abiIity of lead wiII decline. To avoid this, the SEFUSE should not keep around materials (such as cardboard or rubber, etc.) which generate sulfurous acid gas.
q
When the SEFUSE have to be storaged in a cardboard box, the SEFUSE's packs should be put into other bags (such as polyethylene) and make sure the packs seal.
Recommendation
q
Be careful when mounting the thermal cutoff because external force, heat, or a harmful atmosphere (containing excessive humidity or sulfurous acid gas) may damage the characteristics of the thermal cutoff. If applicable, it is recommended to warn general consumers who are not aware of the usage cautions for the thermal cutoff not to mount, remove or replace the thermal cutoff through a note to this effect in the user's manual and other related material.
If you desire any clarifications or explanations regarding these cautions, please call an NEC sales representative.
The values contained in this document were obtained under certain testing conditions at NEC. They are not guaranteed and are for reference only.
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The information in this document is based on documents issued in February, 1999 at the latest. The information is subject to change without notice. For actual design-in, refer to the latest publications of data sheet, etc., for the most up-date specifications of the device. No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Corporation or others. While NEC Corporation has been making continuous effort to enhance the reliability of its electronic components, the possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or property arising from a defect in an NEC electronic component, customer must incorporate sufficient safety measures in its design, such as redundancy, fire-containment, and antifailure features. NEC devices are classified into the following three quality grades: "Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a customer designated "Quality assurance program" for a specific application. The recommended applications of a device depend on its quality grade, as indicated below. Customers must check the quality grade of each device before using it in a particular application. Standard: Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) Specific: Aircrafts, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact an NEC sales representative in advance. Anti-radioactive design is not implemented in this product.
20
SEFUSE
TM
Application Examples
Electric Iron
Transformer
LCD Television
Rice Cooker
Remark() For the purpose of photography, the insulation tube of the thermal cutoff has been removed. In reality, the thermal cutoff is covered by the insulation tube.
Inverter for EL Light Drive
21 19
For further information, please contact:
NEC Corporation NEC Building 7-1, Shiba 5-chome, Minato-ku Tokyo 108-8001, Japan Tel: 03-3798-6148 Fax: 03-3798-6149 [North & South America] NEC Electronics Inc. Electron Components 2880 Scott Boulevard, M/S SC900 P.O.Box 58062 Santa Clara, CA 95052-2554, U.S.A. Tel: 408-588-6160 Fax: 408-588-6130 (Regional Sales Offices) Central Region Greenspoint Tower 2800 West Higgins Road Suite 765 Hoffman Estates, IL 60195, U.S.A. Tel: 708-519-3930 Fax: 708-519-9329 Northern California Region 3033 Scott Blvd. Santa Clara, CA 95054, U.S.A. Tel: 408-588-5100 Fax: 408-588-5134 Eastern Region 901 N. Lake Destiny Drive Suite 320 Maitland, FL 32751, U.S.A. Tel: 407-875-1145 Fax: 407-875-0962 Western Region One Embassy Centre 9020 S.W. Washington Square Road Suite 400 Tigard OR 97223, U.S.A. Tel: 503-671-0177 Fax: 503-643-5911 [Asia & Oceania] NEC Electronics Hong Kong Ltd. 12/F, Cityplaza 4, 12 Taikoo Wan Road, Hong Kong Tel: 2886-9318 Fax: 2886-9022, 2886-9044 Seoul Branch 10F, ILSONG Bldg., 157-37, Samsung-Dong, Kangnam-Ku, Seoul, The Republic of Korea Tel: 02-528-0303 Fax: 02-528-4411 Shen-zhen Office 31st, Floor, Shen-zhen International Financial Bldg. 23 Jian She Road, Shenzhen, China Tel: 755-2227094 Fax: 755-2256360 Australia Representative Office 303-313 Burwoood Highway Burwood East, Victoria 3151,Australia Tel: 03-98878012/98878013 Fax: 03-98878014 NEC Electronics Taiwan Ltd. 7F, No. 363 Fu Shing North Road Taipei, Taiwan, R.O.C. Tel: 02-2719-2377 Fax: 02-2719-5951/5936 NEC Electronics Singapore Pte., Ltd. 101 Thomson Road #04-02/05 United Square Singapore 307591 Tel: 65-253-8311 Fax: 65-250-3583
Document No. Date Published
EM0060EJ8V1SG00 (8th edition) February 1999 M
(c)
1989 (1997)
Printed in Japan

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