This part is a kind of semiconductor called SCK-138 .
Function of this product has NTC Power Thermistor.
Manufacturers : Voltts
Image and pinout :

Some of the text within the PDF file :
SCK-0R78 0.7 8 59 28 96 -40~+200
SCK-0R715 0.7 15 35 29 122 -40~+200
SCK-0120 1 20 20 25 73 -40~+200
SCK-0212 2 12 49 29 101 -40~+200
SCK-2R512 2.5 12 60 29 104 -40~+200
SCK-2R515 2.5 15 46 29 103 -40~+200
SCK-0310 3 10 63 28 100 -40~+200
SCK-058 5 8 93 28 101 -40~+200
SCK-0510 5 10 82 29 123 -40~+200
SCK-0512 5 12 66 29 124 -40~+200
SCK-106 10 6 173 32 100 -40~+200
SCK-108 10 8 122 29 119 -40~+200
SCK-128 12 8 106 24 130 -40~+200
SCK-138 13 8 106 24 130 -40~+200
SCK-206 20 6 190 28 10
[ ... ]
SCK-084 PDF Datasheet Download
