DATA SHEET
Thermal Cutoff SEFUSE
SM/G SERIES
FUSIBLE ALLOY THERMAL SENSITIVE TYPE,
0.5 AMPERES (250 Va.c.) and 3 and 5 AMPERES (50 Vd.c.) Rated Current
The NEC's SEFUSE (SM/G series) is a small, solid and reliable thermal cutoff that can be used under 0.5 A / 250
Vac. 3 and 5 ampere / 50 Vdc. electrical rating type, added to the product line-up lately, is also available. It
protects home appliances and industrial equipment from fire and accident 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)
™ Very small
™ Conpact, durable and veliable 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 a cutoff current of AC 0.5 amperes and DC 3 and 5 amperes.
™ One shot operation.
TM
APPLICATIONS
Transformers
Motors
Battery packs
Electric home appliances
Electric Industrial equipments,
Office automation equipments, etc.
OUTLINE DIMENSIONS (Unit : mm)
φ
40(70) 40(70)5.0
0.53
85(145)
Note: Dimensions in parentheses are for long lead devices.
φ
1.6
φ
0.53
The information in this document is subject to change without notice.
Document No. EM0255EJ5V0DS00 (5th edition)
Date Published March 1998 M
Printed in Japan
©
1992 (1997
)
SM/G SERIES
MARKING
SM/G SERIES
MITI
approved mark
Production control No.
Rated current
∗ Designation of Production Control No.
8 1 0
∗∗ The marking of electrical ratinga is only the AC ratings and the DC ratings is not indicated.
TYPE NAME DESIGNATION
SM 110 G 0
SEFUSE
110 GO
∗
∗∗ ∗∗
Sub-Lot No.
Production month (1 to 9 as Jan. to Sep. and X, Y, Z as Oct., Nov. and Dec.)
Production year (last figure of A. D.)
Tf 115˚C
0.5 A 250V
(example)
~
Brand name
Part number
(First two letters “SM” are omitted)
Rated functioning temperature
Rated voltage
Lead Length (0 : standard lead type, 1 : long lead type)
Series Name (SM/G series)
Operating Temperature
Type Name (SM type)
STANDARD RATINGS
(AC Electrical Ratings)
1)
Part
Number
SM095G0
SM110G0
SM126G0
SM130G0
SM145G0
SM134G0
Rated
Functioning
T emperature
100 ˚C
115 ˚C
131 ˚C
135 ˚C
150 ˚C
139 ˚C
Operating
Temperature
+5
95 ˚C
–0
110±2 ˚C
126±2 ˚C
130±2 ˚C
145±2 ˚C
+3
134 ˚C
–2
TH
Th
TC
65 ˚C
80 ˚C
96 ˚C
100 ˚C
115 ˚C
104 ˚C
TM
Tm
115 ˚C
125 ˚C
140 ˚C
145 ˚C
155 ˚C
200 ˚C
Rated
Current
0.5 Aac
(res.)
Rated
Voltage
250 Vac
(res.)
UL CSA BEAB
2)
(DC Electrical Ratings)
1)
Part
Number
SM095G0
SM110G0
SM126G0
SM130G0
SM145G0
SM134G0
Notes 1) : The type names are for standard lead. When long lead type is required, change the last number “0” to “1”.
2
Rated
Functioning
T emperature
100 ˚C
115 ˚C
131 ˚C
135 ˚C
150 ˚C
139 ˚C
2) : Under application
3) : There is no regulation about d.c. electrical ratings in the Electrical Appliance and Material Control Low of Japan.
4) : The VDE recognized file number had been changed in February 1998. The number in parentheses are previous
file number.
Operating
Temperature
+5
95 ˚C
–0
110±2 ˚C
126±2 ˚C
130±2 ˚C
145±2 ˚C
+3
134 ˚C
–2
TH
Th
TC
65 ˚C
80 ˚C
96 ˚C
100 ˚C
115 ˚C
104 ˚C
TM
Tm
115 ˚C
125 ˚C
140 ˚C
145 ˚C
155 ˚C
200 ˚C
Rated
Current
3 Adc
5 Adc 50 Vdc
Rated
Voltage
UL CSA BEABVDE
E71747
2)
Safety Standard
VDE
6778.2
–1171
–0003
4)
6778.2
–4510
( )
–1005
Safety Standard
33–466
33–472
C0743LR52330E71747
33–467
33–468
33–467
3)
SM/G SERIES
Definition of Terms
●
Rated Functioning Temperature
Rated functioning temperature is the operating temperature of the thermal cutoff, 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 T
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.
F in the UL standard, and by the symbol Tf in the CSA, VDE and BEAB
●
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 cutoffs operation.
It is represented by the symbol T
●
Rated Current
M in the UL standard and by Tm in the CSA, VDE and BEAB standards.
Maximum alternating current that can pass through the thermal cutoff and that the thermal cutoffs can cut off
the circuit in safety and reliability.
●
Rated Voltage
Maximum circuit voltage that the thermal cutoffs can cut off the circuit in safety and reliability.
3
SM/G SERIES
,
,,
,
,,,
,
,,
,
,,
,,,,
,
Performance Data
SM/G Series
SM095G0
SM110G0
SM126G0
10
5
Temperature Rise (˚C)
SM130G0
SM134G0
Temperature Rise Response Time
30
20
10
SM095G0
SM110G0
SM126G0
SM130G0
SM134G0
SM145G0
0
146
SM145G0
145
144
135
134
133
131
SM130G0
130
129
127
SM126G0
126
125
112
SM110G0
111
110
SM095G0
Part
Number
4
99
98
97
Operating
Temperature
(˚C)
Pass-through Current (A)
6
10
5
10
4
10
6
10
5
10
4
10
6
10
5
10
4
10
6
10
5
10
4
10
6
10
5
10
4
10
6
10
5
10
4
10
Insulation
Resistance after
Operation
(MΩ)
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
3.0
2.0
1.0
Withstand Voltage
after Operation
(kV)
SM145G0
5.0
4.0
3.0
6.0
5.0
4.0
6.0
5.0
4.0
6.0
5.0
4.0
6.0
5.0
4.0
13.0
11.0
9.0
Internal
Resistance
(mΩ/25 mm)
Time for opening after immersion
into oil (seconds)
10 20 300
54321
Temperature Difference (˚C)
(oil temp. minus operating temp.)
High Temperature Storage TestInitial Characteristics
SM145G0
SM134G0SM134G0
SM130G0
SM126G0
SM110G0
SM095G0
Part
Number
+
+
+
+
+
+
Change of
Operating
Temperature
(˚C)
5
0
–
5
5
0
–
5
5
0
–
5
5
0
–
5
5
0
–
5
5
0
–
5
0 10 100 1,000 10,000
Time (Hours)
@125˚C
@115˚C
@110˚C
@106˚C
@90˚C
@75˚C
SM/G 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 and 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, these temperatures are 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. Recommended maximum body temperature on a reqular basis
Part Number
SM095G
SM110G
SM126G
SM130G
SM134G
SM145G
to 1 A to 2 A to 3 A to 4 A to 5 A
75˚C 70˚C 65˚C — —
90˚C 85˚C 85˚C 80˚C 75˚C
106˚C 106˚C 100˚C 95˚C 90˚C
110˚C 110˚C 105˚C 100˚C 95˚C
114˚C 114˚C 110˚C 105˚C 100˚C
125˚C 125˚C 120˚C 120˚C 115˚C
Pass-through Current
∗1) : The temperature does not means ambient temperature but surface temperature on
thermal cutoff.
∗2) : When a large current flows through a thermal cutoff, temperature difference occurs
between the case and the lead. Therefore, it is recommended to measure some points
on the thermal cutoff, and make design so that the highest temperature does not exceed
the temperature shown in Table 1.
5
SM/G 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, the body of the thermal
cutoff may be destroyed.
●
Do not use the thermal cutoff in water, organic solvents or other liquids, or envir onments 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 temperatures, 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 mm or more
SecuredSecured
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 1kg or less for the SM type thermal cutoff.
●
The strength applied to the body of the thermal cutoff should be 5 kg or less for the SM type thermal cutoff.
5 kgf max.
0.8 steel wire
φ
Mounting
●
6
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, for example, holding the lead near 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.
SM/G SERIES
●
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).
●
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 5 mm or more
●
After mounting the thermal cutoff, be careful not to apply force that may pull, push or twist the lead wires.
Position of installation
Recommendation
●
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.
7
SM/G 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, 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, au-
dio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots
Special: T ransportation 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.
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