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SF240 Datasheet(PDF) 8 Page - NEC
SF240 Datasheet(HTML) 8 Page - NEC
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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.
After mounting the thermal cutoff, be careful not to apply force that may pull, push or twist the lead wires.
When using an SF type with lead forming, be sure not to make the lead on the resin-sealed side touch the
case. This would cause the current to flow from the lead on the resin-sealed side to the opposite lead so that
the thermal cutoff cannot break the circuit.
Note that the body of the SF type is the same in potential as the circuit. Therefore, it must be electrically
isolated from the other metalic part.
The body and lead A are silver-plated. Therefore, these parts may discolor because of sulfuration. In the case,
the marking of the body wiII become difficult to discriminate or the solder-abiIity of lead wiII decline. To avoid
this, the SEFUSE should not keep around materials (such as cardboard or rubber, etc.) which generate sulfurous
When the SEFUSE have to be storaged in a cardboard box, the SEFUSE's packs should be put into other bags
(such as polyethylene) and make sure the packs seal.
Be careful when mounting the thermal cutoff because external force, heat, or a harmful atmosphere (contain-
ing excessive humidity or sulfurous acid gas) may damage the characteristics of the thermal cutoff. If appli-
cable, 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
The values contained in this document were obtained under certain testing conditions at NEC. They are not
guaranteed and are for reference only.
5 mm or more
Position of installation
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