design and speci? cations are each subject to change without notice. ask factory for the current technical speci? cations before purchase and/or use. should a safety concern arise regarding this product, please be sure to contact us immediately. wirewound resistor with ther mal cut-offs e 1 r 2 u 3 5 4 t 5 b 6 k 7 6 8 r 9 8 10 product code element resistance tolerance standard resistance tolerance resistance value the first two digits are significant figures of resistance and the third one denotes number of zeros following. decimal point is expressed by r as 6.8=6r8 code 5 power 5w type style code t style radial insertion type code j k tol. 5% 10 % fusing resistors thermal cut-offs code b c voltage 250 v 250 v current 2a 2a temp. 134 c 145 c 10 < :j <10 :k rated load (%) ambient temperature ( c) 0 20 40 60 80 120 ?0 ?0 0 20 40 60 80 100 120 160 140 100 25 c 90 c 5tb 5tc wirewound resistor with ther mal cut-offs type: eru5t features accurate fusing characteristics low cost and easy handling space saving design excellent anti-surge characteristics power derati ng curve for resistors operat ed in ambient tem per a tures above 25 c, powe r rating shall be derated in ac cor dance with the ? gure on the right. explanation of part numbers ratings recommended applications switching regulators, video adapters, safety circuits code power rating (w) current rating (a) thermal cut-off (c) resistance range ( ) standard quantity (pcs.) mass (weight) [g/pc.] b 1.6 2 134 0.18 to 680 500 6.5 c 1.8 2 145 0.18 to 680 500 6.5 feb. 2006
design and speci? cations are each subject to change without notice. ask factory for the current technical speci? cations before purchase and/or use. should a safety concern arise regarding this product, please be sure to contact us immediately. wirewound resistor with ther mal cut-offs 1000 100 10 1 110 3 1000 30 100 300 fusing time (s) applied load (w) (wirewound) (thermal cutoff) 1000 100 10 1 110 3 1000 30 100 300 fusing time (s) applied load (w) (wirewound) (thermal cutoff) 1000 100 10 1 110 3 1000 30 100 300 fusing time (s) applied load (w) (wirewound) (thermal cutoff) 1000 100 10 1 110 3 1000 30 100 300 fusing time (s) applied load (w) (wirewound) (thermal cutoff) 13 1 5 +2 ?1 f 0.8 0.1 f 0.6 0.1 25.5 1.5 4.5 +2.0 ?1.0 9 1 safety precautions eru5tbk5r1 eru5tbj100 dimensions in mm (not to scale) fusing characteristics the followin g are precautions for individual products. please also refer to the precautions com mon to fi xed re sis tors shown on page er3 of this catalog. 1. when voltage ex ceeds the rated voltage and/or a current exceeds the rated current and are con tin u ous ly ap plied, the element of wirewound resistor with thermal cut offs (hereafter called the resistors) produces ex ces sive heat, which may no t only deteriorate the built-in the thermal cutoffs but also blow it. 2. the resistor s have a built-in the thermal cutoffs. therefore, use and store them within their re spec tive op er at ing and storing temperature ranges as speci? ed in individual delivery spec i ? ca tions. 3. carefully chec k the inductance effect of the resistors when using them in a high-frequency cir cuit. 4. if a transient load (heavy load in a short time) li ke a puls e is expected to be applied, check and eval u ate the operations of the resistors when installe d in your products under the most ad verse conditions before use. packaging methods please contact the factory for packaging meth ods. eru5tbk6r8 eru5tbj150 feb. 2006
? er3 ? safety precautions (common precautions for fixed resistors) when using ou r products, no matter what sort of equipment they might be used for, be sure to make a written agreement on the speci? cations with us in advance. the design and speci? cations in this catalog are subject to change without prior notice. do not use the products beyond the speci? cations described in this catalog. this cata log explains the quality and performance of the products as individual components. be fore use, check and evaluate their operations when installed in your products. install the following systems for a failsafe design to ensure safety if these products are to be used in equip ment where a defect in these products may cause th e loss of human life or other signi? cant damage, such as damage to vehicles (au to mo bile, train, vessel), traf? c lights, medical equipment, aerospace equipment, elec tric heating ap pli anc es, com bus tion/gas equipment, rotating equipment, and disaster/crime prevention equip ment. ? systems equipped with a protection circuit and a protection device ? systems equip ped with a redundant circuit or other system to prevent an unsafe status in the event of a single fault (1) precauti ons fo r use these products are designed and manufactured for general and stan dard use in general elec tron ic equipment (e.g. av equipm ent, home el ectric ap pli anc es, of? ce equipment, information and com mu ni ca tion equipment) these products are not intended for use in the following special conditions. be fore u sing the products, care ful ly check the effects on their quality and performance, and determine whether or not they can be used. 1. in liquid, such as water, oil, chemicals, or organic solvent 2. in direct sunlight, outdoors, or in dust 3. in salty air or air with a high concentration of corrosive gas, such as cl 2 , h 2 s, nh 3 , so 2 , or no 2 4. electric static discharge (esd) environment these components are sensitive to static electricity and can be damaged under static shock (esd). please take measures to avoid any of these environments. smaller componen ts are more sensitive to esd environment. 5. electromagnetic environment avoid any enviro nment where stro ng electromagnetic waves exist. 6. in an environment where these pr oducts cause dew condensation 7. s e a li n g o r c o ating of these products or a printed circuit board on which thes e products are mounted, with resin or othe r materials these products generate joule heat when energized. carefu lly position th ese products so that their heat will not affect th e other components. carefully position thes e products so that their temperatures will not exceed the category temperature range due to the effect s of neighboring heat-generating com po nents. do not mount or place heat-generating com po nents or in? ammables, such as vinyl-coated wires, near these products . note that non- cleaning solder, halogen-based highly active ? ux, or water-soluble ? ux may dete riorate the performance or reliab ility of the products. carefully select a ? ux cleaning agent fo r use after soldering. an unsuit able agent may deteriorate the performance or reliability. in particular, when using water or a water-soluble cleaning agent, be careful not to leave water res i dues. otherwise, the insulation performance may be deteriorated. (2) precaution s for storage the performance of these products, including the solderability, is guaran teed fo r a year from the date of arrival at your company, provided that they remain packed as they were when delivered and stored at a temperature of 5 c to 35 c and a relative humidity of 45 % to 85 %. even wi thin the above guarantee periods, do not store these products in the fol low ing conditions. otherwise, their elec tri cal performance and/or solderability may be dete riorated, and the packaging materials (e.g. tap ing ma te ri als) may be de formed or dete riorated, resulting in mounting failures. 1. in salty air or in air with a high concentration of corrosive gas, such as cl 2 , h 2 s, nh 3 , so 2 , or no 2 2. in direct sunlight package ma rkings include the product number, quantity, and country of origin. in principle, the country of origin should be indicated in english. feb. 2006
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