NPC SM-G Technical data
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
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