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Thermofuses (Thermal Cut-off / TCO)
Uchihashi is a Japanese company with its headquarter in Osaka.
1918 Start of Production & Sales of solders
1945 The company was rebuilt after the war
1970 Start production of temperature fuses
1987 Name change in Estec Uchihashi. Co. Ltd.
Structure and function principles - for axial and radial comparable:
 1. Special mixture (mixture of resin) liquefied by temperature increase (starts liquefaction from 60??, Depending on the TCO-type)
2. Backup element begins to melt when the melting point is reached
3. Due to the surface tension of the special resin mixture the melted fuse element is enclosed and pressed to the connector legs so that the contact is interrupted
Caution:
Axial and radial - only through hole technology
Only suitable for hand soldering!
TCO Axial:
| series |
L x diameter
(TCO body) |
temperature range |
electric parameters |
| 12 |
9,0 x 2,5 mm |
+65°C .. +145°C |
2A* / 250 Vac |
| 22 |
11,5 x 3,3 mm |
+108°C .. +145°C |
5A* / 250 Vac |
| 32 |
6,0 x 2,0 mm |
+108°C .. +145°C |
1A* / 250 Vac |
| 44 |
6,0 x 1,65 mm |
+108°C .. +145°C |
0,5A* / 250 Vac |
TCO Radial:
| series |
L x diameter x thickness
(TCO body) |
temperature range |
electric parameters |
| U2 |
6,6 x 5,7 x 2,5 mm |
+108°C .. +145°C |
2.5A* / 250 Vac |
| X |
8,5 x 6,6 x 2,5 mm |
+108°C .. +133°C |
3A / 250 Vac |
| S |
5,2 x 4,0 x 2.2 mm |
+108°C .. +145°C |
1A* / 250 Vac |
* Currents can vary within series.
TCO Applications
1. Varistor Overheating Protection
2. Overload Protection
Too much power overheats the resistors and activates the TCO.
3. Transformer / Inductor / Electro Motor Overheating Protection
(Overtemperature => TCO in winding)
4. MOSFET/ELECTRONIC Overload Protection
(Overtemperature => TCO Mounted on housing) |
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