DATA SHEET
Document No. EM0244EJ2V1DS00
(KC–15003)
Date Published February 1998 M
Printed in Japan
ORGANIC THERMAL SENSITIVE PELLET TYPE
10 AMPERES RATED CURRENT
Thermal Cutoff SEFUSETM
SF/E SERIES
The information in this document is subject to change without notice.
©
1996
NEC's thermal cutoff SE/E series is small, solid and reliable product which can be used under 10 amperes of
rated current. It protects home appliances and industrial equipment from fire by opening of electrical circuit if it
senses an abnormal temperature rise.
FEATURES
™Approved by UL(USA), CSA(Canada), VDE(Germany), BEAB(UK), and MITI(Japan)
™Single operation
™Compact, durable and reliable by hermetic seal structure
™Excellent sensitive to abnormal temperature rise and high accuracy in operation
™Stable characteristics in a long-term
™Capable of opening at large cutoff current of AC 10 amperes
APPLICATIONS
Electric home appliances
Electric industeial equipments
Office automation equipments
Plain paper copiers
Transformers
Motors, etc.
OUTLINE DIMENSIONS (mm)
11
1.0
φ
1.0
φ
4.2
φ
66(81)
20(35) 35
Note: Dimensions in ( ) are for long lead devices.
2
SF/E SERIES
TYPE NAME DESIGNATION
SF 139 E –1
Lead Length (none: standard lead type, –1: long lead type)
Series Name (SF/E series)
Operating Temperature
Type Name (SF type)
MARKING
MITI
Approved Mark
Factory Code
Brand Name
SEFUSE
SF139E
Tf142˚C
10 A
250V~
Type Name
Production Control No.
Rated Functioning Temperature
Rated Current
Rated Voltage
∗
∗∗
∗ Factory Code represents the manufactured placce as shown below.
Japan : none, Thailand : B
∗∗ Designation of Production Control No.
98 7 0 (example)
Sub-Lot No.
Manufactured month (1 to 9 as Jan. to Sep. and X, Y, Z as Oct., Nov. and Dec.)
Manufactured year (last two figures of A. D.)
3
SF/E SERIES
Notes :1) The type are for standard lead. When long lead type is required, add “–1” at the end of type name.
2) The maximum temperature limit of SF226E is partially approved as shown below.
RECOGNIZED MAXIMUM TEMPERATURE LIMIT OF SF226E
∗ Under application to increase to 300˚C
3) The additional electrical ratings are recognized by UL and CSA as follows.
UL : 277 Vac / 15 A (Resistive), 240 Vac / 15 A (Resistive), 120 Vac / 15 A (Resistive, Inductive),
CSA : 250 Vac max. / 15 A max. (Resistive, Inductive)
4) SF169E, SF188E, SF214E, SF226E and SF240E are recognized the Conductive Heat Aging Test (CH-ratings) of UL.
Type
Name
SF70E
SF76E
SF91E
SF96E
SF109E
SF119E
SF129E
SF139E
SF152E
SF169E
SF188E
SF214E
SF226E
SF240E
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
76±2 ˚C
91±2 ˚C
96±2 ˚C
109±2 ˚C
119±2 ˚C
129±2 ˚C
139±2 ˚C
152±2 ˚C
169±2 ˚C
188±2 ˚C
214±2 ˚C
226±2 ˚C
237±2 ˚C
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
350 ˚C
Rated
Current Rated
Voltage
Safety Standard
UL CSA VDE BEAB
33–312
33–331
33–332
33–333
33–334
33–335
33–336
33–549
33–354
made
in Japan
33–835
33–834
33–833
33–832
33–831
33–830
33–827
33–828
made
in Thailand
STANDARD RATINGS
10 Aac
(Resistive)
250 Vac
(Resistive)
LR
52330
E71747 C0623
6778.2
–4510–
1008
1
3
3
1
1
3
1
3
0
4
3
1
3
1
3)3)
2)
SF226E UL
240˚C CSA
330˚C VDE
300˚C BEAB
300˚C
4)
∗
4
SF/E SERIES
Definition of Terms
●Rated Functioning Temperature
Rated functioning temperature is the operating temperature of thermal cutoffs, measured using the method
specified in the safety standard. In Electrical Appliance and Material Control Law of Japan, case operation
should be within the specified operating temperature range of ± 7 ˚C. In standards that comply with the IEC
standard (such as UL, CSA, VDE, BEAB), 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
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.
●Operating Temperature
Operating temperature is the 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.
●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 168 hours.
It is represented by the symbol TH in the UL standard, Th in the CSA standard, and Tc in the VDE and BEAB
standards.
●TM, Tm (Maximum Temperature Limit)
Maximum temperature limit is the maximum temperature for which conductivity does not occur again after
thermal cutoff operation.
It is represented by the symbol TM in the UL standard and by Tm in the CSA, VDE and BEAB standards.
●Rated Current
Maximum alternating current that can pass through the thermal cutoff and that the thermal cutoff can cut off
in safety and reliability.
●Rated Voltage
Maximum circuit voltage that the thermal cutoff can cut off in safety and reliability.
5
SF/E SERIES
Performance Data
SF/E Series
55
10
20
30
SF/E
Temperature Rise (˚C)
Temperature Rise Response Time
High Temperature Storage TestInitial Characteristics
Temperature difference (˚C)
(oil temp. minus operating temp.)
Time for opening after immersion
into oil (seconds)
Pass-through Current (A)
40
10 15 20
20 30 4010
10
20
30
40
0
SF169E
SF139E
SF109E
SF96E
SF70E
Part
Number
SF169E
SF139E
SF109E
SF96E
SF70E
Part
Number Time (Hours)
Operating
Temperature
(˚C)
Insulation
Resistance after
Operation
(MΩ)
Change of
Operating
Temperature
(˚C)
Withstand Voltage
after Operation
(kV)
Internal
Resistance
(mΩ/25 mm)
169
167
168 2.0
1.0
1.5 1.5 @140˚C
@119˚C
@89˚C
@76˚C
@50˚C
0.5
1.0
+2
–2
0
10
6
10
4
10
5
140
138
139 2.0
1.0
1.5 1.5
0.5
1.0
10
6
10
4
10
5
112
110
111 2.0
1.0
1.5 1.5
0.5
1.0
10
6
10
4
10
5
97
95
96 2.0
1.0
1.5 1.5
0.5
1.0
10
6
10
4
10
5
71
69
70 2.0
1.0
1.5 1.5
0 10 100 1,000 10,000
0.5
1.0
10
6
10
4
10
5
+2
–2
0
+2
–2
0
+2
–2
0
+2
–2
0
Note : The values following @ are the storage temperature.
6
SF/E SERIES
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
●Do not use this device for any 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.
●Do not use this device in aerospace equipment, aeronautical equipment, nuclear reactor control systems, Iife
support equipment or systems, transportation machinery engine control or safety-related 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).
●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.
●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 temperatures
lower than the normal operating temperature. Malfunctions may also occur. Even if the thermal cutoff's
operating temperature is exceeded, it may malfunction.
Table 1.
Type
SF 70E
SF 76E
SF 91E
SF 96E
SF109E
SF119E
SF129E
SF139E
SF152E
SF169E
SF188E
SF214E
SF226E
SF240E
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
7
SF/E SERIES
●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.
●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
causing the fuse to malfunction.
●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.
Lead wire process
●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
SecuredSecured
Mounting
SEFUSE can be mounted by soldering, caulking, or welding.
●If soldering, note that the thermal cutoff may not function because of excessive solder temperature.
To prevent such malfunctions, you can hold the lead near the case using a tool and solder for short intervals
at a time, allowing the heat to escape.
Another effective method is to use a lower solder temperature and to solder at a location that is distant from
the case.
●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).
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 ther-
mal cutoff also may not operate even if the thermal cutoff's operating temperature is exceeded.
0.8 steel wire
SF(10 kgf)
φ
The lead wire should be bent at a distance 3 mm or more from the body of the fuse, and should not be twisted.
●The tensile strength applied to the lead wire should be 5 kg or less.
●The strength applied to the body of the thermal cutoff should be 10 kg or less.
8
SF/E SERIES
●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.
●After mounting the thermal cutoff, be careful not to apply force that may pull, push or twist the lead wires.
●When using an SF type with lead forming, 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
●The body and lead A are silver -plated. Therefore, these par ts 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.
●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
●Be careful when mounting the thermal cutoff because external force, heat, or a harmful atmosphere (contain-
ing excessive humidity or sulfurous acid gas) may damage the characteristics of the thermal cutoff. If appli-
cable, 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.
5 mm or more Position of installation
9
SF/E SERIES
10
SF/E SERIES
11
SF/E SERIES
SF/E SERIES
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, customers must incorporate
sufficient safety measures in its design, such as redundancy, fir e-containment, and anti-failure 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.
