SM / A SERIES
Contents
1. NEC SM A SERIES f 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 should be 5mm or more from the body of the thermal cutoff _ _ 5mm or more 5mm or more Connecting position e After mounting the thermal cutoff be careful not to apply force that may pull push or twist the lead wires Storage e The leads of SM164A and SM182A are silver plated Therefore these parts may discolor because of sulfuration In the case the solder ability of lead will decline To avoid this the SEFUSE should not keep around materials such as cardboard or rubber etc which generate sulfurous acid gas Recommendation e 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 call2. e 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 e When bending the lead wire in order to protect the resin seal from excessive pressure secure the lead wire close to the case and bend the part beyond the secured section 3 mmor more lt Secured 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 e The tensile strength applied to the lead wire should be 1kg or ress for the SM type thermal cutoff e The strength applied to the body of the thermal cutoff should be 5 kg or less for the SM type thermal cutoff 0 8 steel wire Mounting SEFUSE can be mounted by soldering caulking or welding e f 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
3. DATA SHEET NI EC Thermal Cutoff SEFUSE SM A SERIES FUSIBLE ALLOY THERMAL SENSITIVE PELLET TYPE 2 AMPERES RATED CURRENT NEC s SEFUSE SM A series is a small solid and reliable product which can be used under 2 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 O Approved by UL USA CSA Canada VDE Germany BEAB UK and MITI Japan o One shot operation Compact durable and reliable by hermetic seal structure o Excellent sensitive to abnormal temperature rise and high accuracy in operation O Stable characteristics in a long term O Capable of opening at cutoff current of AC 2 amperes APPLICATIONS Transformers Motors Battery packs Solenoid Electric home appliances Electric Industrial equipments Office automation equipments etc OUTLINE DIMENSIONS Unit mm 19 al lt o o o _ se 38 68 T L 9 l 38 68 85 145 at a Note Dimensions in parentheses are for long lead devices The information in this document is subject to change without notice Document No EM0253EJ2V1DS00 Date Published April 1998 M Printed in Japan NEC Corporation 1997 SM A SERIES NEC TYPE NAME DESIGNATION SM 130 A 0 Lead Length 0 standard lead type 1 long lead type Series Name SM A series Operating Temperatu
4. 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 NEC SM A 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 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 acustomer designated qualit
5. 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 temperature 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 Name Body Temperature SMO065A0 SMO65A1 45 C SM072A0 SM072A1 52 C SMO095A0 SMO95A1 75 C SM110A0 SM110A1 90 C SM126A0 SM126A1 106 C SM129A0 SM129A1 106 C SM130A0 SM130A1 110 C SM134A0 SM134A1 114 C SM145A0 SM145A1 125 C SM164A0 SM164A1 140 C SM182A0 SM182A1 140 C SM A SERIES NEC e 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 e 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
6. d 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 life 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
7. ds 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 e 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 e 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 Tm in the UL standard and by Tm in the CSA VDE and BEAB standards e Rated Current Maximum alternating current that can pass t
8. hrough the thermal cutoff and that the thermal cutoff can cut off in safety and reliability e Rated Voltage Maximum circuit voltage that the thermal cutoff can cut off in sefety and reliability SM A SERIES NEC Performance Data SM A Series Temperature Rise Response Time CC 6 5 smogsao 30 F SM110A0 SM095A0 SM126A0 i 1 SM110A0 SM130A0 a A SM126A0 T SM145A0 z A SM130A0 2 En z A SM145A0 am 20 f 2 fo 5 T M pei DOT A EO 5 a8 2 10 S PE Eg FE 0 0 1 2 Temperature Difference C oil temp minus operating temp Pass through Current A Initial Characteristics High Temperature Storage Test m 125 C SM145A0 a l SM145A0 0 p t 1 0 i sr ysl 110 C SM130A0 af l SM130A0 or r er oaa 1 0 f 5 en 106 C SM126A0 a l SM126A0 ee ee E 1 0 5 90 C 3 0 57 SM110A0 it on SM110A0 plg py 109 10 1 0 Sr 99 10 3 0 5F Sme SMO095A0 og j m SMO095A0 Ope E 97 10 1 0 aa T T T T T n ii n Ch f Part Operating esistance atter Withstand voltage Internal pat operating 0 S 9A 1 000 10 000 Number C ete kv ma 25 mm Number semie Sa Time Hours Note The values following are the storage temperature NEC SM A SERIES Cautions This section describes cautions designed to protect the performance of the thermal cutoff Be sure to read an
9. re Type Name SM type MARKING SEFUSE Brand Name MITI S M 1 3 0 A 0 aor Type Name Approved Mark e ER ee oe OOO Production Control No I Tf135 C op Rated Functioning Temperature I Rated Current 2A 250V Rated Voltage Designation of Production Control No 870 example 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 STANDARD RATINGS Rated Functioning Temperature 70 C 652 C 76 72 3 2 C 3 95 5 0 C 110 2 C E71747 126 2 C 129 0 5 C 1302 C 134 2 C 145 2 C 164 3 2 C 182 2 C Notes 1 The type names are for standard lead When long lead type is required change the last number 0 to 1 2 The colored place means recognized safety standard 3 Under application for C UL Safety Standard 2 Operating Rated Rated Temperature Current Voltage CSA VDE BEAB D O A A A A G G a O NEC SM A SERIES Definition of Terms e 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 standar
10. y 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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