This part is a kind of semiconductor called SCK-473.

Function of this product has NTC THERMISTORS.

Manufacturers : Microtherm

Image and pinout :

Some of the text within the PDF file :

NTC THERMISTORS - SCK 15 Series Features: q NTC Surge Protectors limit the current at switch on, particularly useful for high capacative/inductive loads. 1.2 Order code SCK __ Zero Power Resistance _ Steady State Current Part No. SCK-1R38 SCK-1R58 SCK-2R58 SCK-037 SCK-056 SCK-057 SCK-075 SCK-105 SCK-164 SCK-204 SCK-253 SCK-403 SCK-473 Zero Power Resistance at 25°C (W) 1.3 1.5 2.5 3 5 5 7 10 16 20 25 40 47 Max. Steady (25°C Ambient) State Current Approx. at 25°C Resistance (A) ( W) 8 0.064 8 0.062 8 0.075 7 0.091 6 0.121 7 0.098 5 0.161 5 0.178 4 0.261 4 0.283 3 0.425 3 0.511 3 0.501 Thermal Dissipation Constant (mw/°C) 21 21 20 21 20 20 20 20 19 18 21 22 20 Thermal time Constant (Sec.) 59 66 63 73 66 65 79 79 79 90 76 83 77 Operating Temp. (°C) -40~+200 -40~+200 -40~+200 -4 [ ... ]

SCK-473 PDF Datasheet Download