NTE8000 thru nte8035 radial lead thermal cutoff (thermal fuse) description: the tco (thermal cut-off) responds to temperature by interrupting an electrical circuit when the operating and/or environ\ mental temperature exceeds the thermal rating of the device. nte's radial lead tcos accomplish this when the internal fusible alloy is melted by reaching the temperature of the me lting point of the alloy, forming two separate balls at the edges of the leads by surface tension of the alloy to permanently open the circuit. axial-lead tco devices presently predominate over radial-lead devices. this results, at least in part, from design diffi\ culties that exist in manufacturing a reliable, inexpensive radial-lead tco device. however, in many circuit applications radial-lead devices are preferable since they take up a smaller area on a printed circuit board. their compact size enables ease of assembly into the smallest of transformers ensuring total thermal protection features maximum rating: 5 amps, 250 volts full 2 3/4 leads to fit all replacement configurations all types meet the requirements of underwriters laboratories specifications and cul rohs compliant characteristics nte type no. diag. no. functioning temperature holding temperature maximum temperature c f c f c f 8000 729 76 168 53 127 200 392 8005 729 86 187 61 142 200 392 8010 729 102 216 77 171 200 392 8015 729 115 239 89 192 200 392 8020 729 130 266 103 217 200 392 8025 729 136 277 111 232 200 392 8030 729 145 293 118 244 200 392 8035 729 150 302 123 253 200 392 diagram 729 2.756 (70.0) .276 (7.0) .031 (0.8) .106 (2.7) .260 (6.6) note 1. temperature sensitive devices. do not store above +48 c (+120 f). note 2. with proper air flow, heat generation below 5 amps is minimal, above 5 amps the upper limit on the currentcapac\ ity will depend on the environment for each specific application. note 3. a general rule of thumb for continuous operating temperature for thermal cut-offs is 30 c less than the maximum opening temperature.
|
