the thermal df series thermal cutoffs are single action devices that open when a preset temperature is reached. they do not reset. the active component of a ther- mal cutoff is an electrically insulated thermal pellet. this pellet holds a spring loaded contact against a fixed contact under normal operating temperatures. (see fig. 1) when the preset temperature of the cutoff is reached, the pellet liquifies, the springs relax, and the spring loaded contact is moved away from the fixed contact, opening the circuit. (see fig. 2) the df series is the right choice for applications requiring an inex- pensive limit protector with 15a capability. (fig. 1) closed (fig. 2) open b e c d a features ?various temperature settings ?miniature size ?current rating: 15 amp/125 v ac, 10 amp/250 vac ?economical ?accurate ?large inventory; same day shipping ?various mounting options a pplications thermal cutoffs are widely used to prevent damage from overheating in electrical products ?appliances - space heaters, irons, stoves, electric blankets, hair dryers, clothes dryers, cookers, toaster ovens, crock pots, mixers, toasters, microwave ovens, etc. ?motors - air conditioners, copiers, fans, washing machines, compressors, etc. ?electronics - tvs, stereos, tape recorders, video recorders, fluorescent lamps, transformers, computers, surge suppres- sors, telecommunication equipment, etc. www.thermtrol.com e-mail: sales@thermtrol.com 8914 pleasantwood ave., n.w. ?p.o. box 2501 ?north canton, oh 44720 ?(330) 497-4148 ?fax (330) 497-4189 df series standard dimensions (mm) abcde 25.4 1 10.5 0.5 35 1 ? 0.05 ?.0 0.1 custom lead lengths are available.
te r minology: functioning temperature (tf) the temperature at which a thermal cutoff changes its state of conductivity to open a circuit with detection current of 10ma or less as the only load. the temperature tolerance for the ul and csa standard is +0 c / -10 c. holding temperature (th) the maximum temperature at which a thermal cutoff can be main- tained while conducting rated current for 168 hrs. without functioning. maximum temperature (tm) the maximum temperature at which mechanical and electrical prop- erties of a thermal cutoff can be maintained for 10 minutes without resuming conductivity after functioning. electrical ratings and selected agency approvals functioning part te mperature ( c) th tm 15 amp/125vac 15 amp/125vac 10 amp/250vac number to l: +0 c/-4 c ( c) ( c) 10 amp/250vac 10 amp/250vac df66s 66 42 130 df72s 72 50 110 DF77S 77 55 130 df84s 84 60 114 df91s 91 67 121 df98s 98 76 130 df100s 100 78 135 df104s 104 80 150 df110s 110 8 8 140 df119s 119 9 5 170 df128s 128 106 155 df139s 139 117 170 df141s 141 117 171 df144s 144 120 240 df152s 152 128 175 df170s 170 146 190 df184s 184 160 214 ? df192s 192 167 210 ? * * df198s 198 170 244 ??? df216s 216 186 241 ?? * * df228s 228 193 248 ? * * df240s 240 200 260 ? * * ul/ cul: e117626 vde: 115369, *116219 precautions when using thermal cutoffs the following information describes the correct methods of using thermal cutoffs to insure proper and safe performance. to achieve the full use and capacity of a thermal cutoff, it is necessary for the customer to exercise proper storage and execute appropriate circuit design, proper installation, and adequate testing. thermtrol corporation does not assume responsibility for problems which occur as a result of improper storage and installation, or inappropriate circuit design, evaluations or tests. ? do not use thermal cutoffs for purposes other than for what they are intended. thermal cutoffs operate only when they sense an ambient temperature greater than the factory pre-set temperature. they have no ability to function by current overload and are not current limiting devices. ? do not use thermal cutoffs in equipment, appliances or devices intended to be used in the aerospace industry, aviation, nuclear power generation systems, life support systems, engine control systems, or safety control systems for transportation. thermal cutoffs are applicable for electrical household devices, appliances and electronics. other applications include: office automation equipment, audiovisual equipment, communication systems, measuring instru- ments and specific transportation systems. ? do not use thermal cutoffs in applications exceeding the listed ratings in the specification chart. ? do not use thermal cutoffs in a liquid, in a corrosive atmosphere such as sulfurous gas, or in a high humidity environment. ? customers shall choose the thermal cutoff appropriate for the application and determine the proper mounting position and/or method. to judge whether the selected thermal cutoff and chosen position and method of mounting is suitable for the final application, we recommend that the customer fully test and evaluate the unit in an environment that duplicates the final application as closely as possible. this includes mounting and securing the thermal cutoff identically to the method that will be used in production. opening temp. max. soldering time under 120 c 2 seconds over 120 c 3 seconds maximum soldering time at solder bath temperature of 300 c handling and installation ins tr uctions when using thermal cutoffs, considerable caution should be exer- cised as follows: a. installation ? mount the thermal cutoff in a location where uniform radiation of heat is sustained over the body of the unit. ? keep the leads as long as possible to maximize the area of expo- sure to heat. ? place and connect the thermal cutoff in a manner so that no external mechanical force will be applied to the body and/or leads of the thermal cutoff. ? allow adequate space for mounting the thermal cutoff. b. lead bending ? when bending a lead, bend at a location 5mm minimum from the body of the thermal cutoff. ? t ake caution not to damage either the thermal cutoff body or the lead. ? keep the thermal cutoff body free from any push, pull or twist force. c. soldering note: the special sealant joining the lead wires to the case will soften during soldering. care must be taken to not move the leads or body during the soldering process as the softened joints could shift and become disconnected. the sealant will resume its initial strength after cooling. ? minimize the conduction of excessive heat to the thermal cutoff body when soldering. ? maximum soldering time is shown in table above. ? solder 20 mm minimum from the thermal cutoff body. ? during soldering, both the thermal cutoff body and leads should be free of any push, pull or twist force. ? after soldering, allow the thermal cutoff to cool for 30 seconds minimum without moving it. 12/13 c approved ? pending
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