Power resistors type MPC

Construction and execution

The special design features of these metal strip resistors offer a series of advantages compared to the known axially capped wirewound resistors due to the use of a technologically differently designed resistance element. This is punched as a meander out of a metal strip (special alloy of Ni / Cr / Fe / Cu). The connecting wires (DUMET wires) are welded to the metal strip without using any caps.

Thus, the two-dimensional structure has only a very small inductive resistance. The negative effect of the strong temperature drop from the „hotspot zone“ in the middle of the resistor to the two ends, which is suf ciently known from axial and capped resistors, does not occur with MPC resistors since the connecting wires have a substantially smaller surface than the element and no caps. The consistent distribution of the temperature over the element, which is thus largely been achieved, is additionally supported by housing the element in a hermetically sealed ceramic housing. Spaces are lled with ceramic powder before closing with special cement.

Due to the almost consistent heat dissipation across the entire housing, there is even the possibility of a multiple increase in the power rating by putting a suitable heat sink over the housing.

Features

• Excellent size-performance ratio
• Nominal power range: 2 W up to 10 W
• Tolerance up to 1%
• Temperature coefficient up to ± 50ppm/K possible

Application fields

• various electronic applications