Thank you for your inquiry Moe1. The size of the cross section of 5TC-TT-J-40-36 is 0.4 x 0.7 mm (0.017" x 0.026"). You cannot use 5TC-TT-J-40-36 at temperatures up to 500 °C since it is only rated for temperatures up to 260 C and will start to melt if used in temperatures over 260 C.