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| DATA S H E E T Thermal Cutoff SEFUSETM 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 TM Approved by UL (USA), CSA (Canada), VDE (Germany), BEAB (UK) and MITI (Japan) TM Very small TM Conpact, durable and veliable by hermetic seal structure. TM Excellent sensitive to abnormal temperature rise and high accuracy in operation. TM Stable characteristics in a long-term. TM Capable of opening at a cutoff current of AC 0.5 amperes and DC 3 and 5 amperes. TM One shot operation. APPLICATIONS Transformers Motors Battery packs Electric home appliances Electric Industrial equipments, Office automation equipments, etc. OUTLINE DIMENSIONS (Unit : mm) 0.53 1.6 0.53 40(70) 5.0 85(145) 40(70) Note: Dimensions in parentheses are for long lead devices. The information in this document is subject to change without notice. Document No. EM0255EJ5V0DS00 (5th edition) Date Published March 1998 M Printed in Japan (c) 1992 (1997) SM/G SERIES MARKING SM/G SERIES MITI approved mark SEFUSE 110 GO Brand name Part number (First two letters "SM" are omitted) Rated functioning temperature Rated voltage Production control No. Rated current Tf 115C 0.5 A 250V ~ Designation of Production Control No. (example) 810 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.) The marking of electrical ratinga is only the AC ratings and the DC ratings is not indicated. TYPE NAME DESIGNATION SM 110 G0 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 Operating Functioning Temperature Temperature 100 C 115 C 131 C 135 C 150 C 139 C 95 +5 -0 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 Rated Voltage Safety Standard UL CSA VDE 6778.2 -1171 -0003 BEAB 33-466 33-472 C0743 33-467 33-468 33-467 C 1102 C 1262 C 1302 C 1452 C 134 +3 -2 0.5 Aac (res.) 250 Vac (res.) E71747 LR52330 4) () 6778.2 -4510 -1005 2) C (DC Electrical Ratings) 1) Part Number SM095G0 SM110G0 SM126G0 SM130G0 SM145G0 SM134G0 Notes 1) : 2) : 3) : 4) : 2 Rated Operating Functioning Temperature Temperature 100 C 115 C 131 C 135 C 150 C 139 C 95 +5 -0 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 Rated Voltage Safety Standard UL CSA VDE BEAB 3) C 1102 C 1262 C 1302 C 1452 C 134 +3 C -2 5 Adc 50 Vdc E71747 2) The type names are for standard lead. When long lead type is required, change the last number "0" to "1". Under application There is no regulation about d.c. electrical ratings in the Electrical Appliance and Material Control Low of Japan. The VDE recognized file number had been changed in February 1998. The number in parentheses are previous file number. SM/G SERIES Definition of Terms q 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 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. q 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. 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 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. q 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 TM in the UL standard and by Tm in the CSA, VDE and BEAB standards. q Rated Current Maximum alternating current that can pass through the thermal cutoff and that the thermal cutoffs can cut off the circuit in safety and reliability. q 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 Temperature Rise SM095G0 Response Time 10 Temperature Rise (C) SM110G0 SM126G0 SM130G0 SM134G0 5 SM145G0 0 1 2 3 4 5 Pass-through Current (A) ,,,,,,,, ,, ,,,, , ,,,,,,,,,, , ,, ,,,, , ,, ,,, ,, , , ,, , , ,, ,, 30 SM095G0 SM110G0 SM126G0 SM130G0 SM134G0 SM145G0 Time for opening after immersion into oil (seconds) 20 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 6.0 5.0 4.0 13.0 11.0 9.0 Part Number 106 105 104 106 105 104 106 105 104 106 105 104 106 105 104 106 105 104 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 3.0 2.0 1.0 +5 SM145G0 @125C 145 144 135 0 -5 +5 @115C SM134G0 134 133 131 SM134G0 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) 4 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 q 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. 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 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). 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, 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 Pass-through Current Part Number to 1 A SM095G SM110G SM126G SM130G SM134G SM145G 75C 90C 106C 110C 114C 125C to 2 A 70C 85C 106C 110C 114C 125C to 3 A 65C 85C 100C 105C 110C 120C to 4 A -- 80C 95C 100C 105C 120C to 5 A -- 75C 90C 95C 100C 115C 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 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, 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 temperatures, or any other malfunctions may occur. Also, the thermal cutoff may not operate even if its operating temperature is exceeded. 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 mm or 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 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. q 5 kgf max. 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 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. 6 ,,,,, ,, Secured ,,, ,,, 0.8 steel wire SM/G SERIES 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). q 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 Position of installation q After mounting the thermal cutoff, be careful not to apply force that may pull, push or twist the lead wires. 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. 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, 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. |
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