Metal Ceramic Compound Resistors

Technical Specifications:

Style

Tube shaped resistor (bulk ceramic or compound resistor).

Outer Diameter 25 mm, Inner Diameter 13 mm.

Special designs e.g. rods with diameter 10, 18 and 25 mm, for Discs, please contact us.

Resistor Material

Ohmic behaviour up to 10 MHz. Extremely Low Inductance.

High Temperature Stability by selected ceramic and metallic raw materials. Short time overrating up to 200% admissible.

Negative Temperature Coefficient of Resistivity. At high voltages or temperatures the resistance under working conditions is decisive.

Surface temperature up to 360 °C permissible.

Specific resistance from 0.01 to 100.000 Ω.cm.

Field of Application

Up to 40 kV and 10 kW. For impulses from nanoseconds to minutes, for high power.

The power range depends on shape and quantity of resistors, insulation and mode of terminations as well as cooling and insulating conditions.

Range of Resistivity

The resistance ranges available for different resistor lengths are as follows:

Assembly

In order to get definite data for resistance and power the resistors may be connected together in any way to increase the energy withstanding capabilities of the complete assembly.

If necessary the resulting network should be measured as a whole unit.

Metallisation

Normally the contacts are aluminised.

On request, copper and brass are available. Usually both ends are metallised over a length of 10 to 30 mm. The faces are also metallised.

Termination

The following additional types of clamping are available:

• Ground to a nominal diameter of 25 mm and contacted.
• Straight clamp.
• Socket clamp.
• Axial clamp.
• Special termination (e.g. tinned, with wire leads) according to customer's requirements.

Coating

In order to protect the resistors against environmental stress, the resistors could be coated with non-inflammable (UL94-V0) blue epoxy resin. Due to the coating material, the maximum admissible surface temperature is limited to 150 °C.

Cooling

The resistors can be applied in free air as well as special dielectrics e.g. protective gas, transformer oil, deionised water etc. This also helps for example, to avoid partial discharges and increases heat dissipation.

Environmental Compatability

The resistor material consists of sintered ceramic, which is formed out of natural inorganic raw materials as well as metals with a high chemical and thermal resistance.

During application, it is possible that other materials are deposited in the porosity of the ceramic, which must be taken into consideration when the resistor has reached its end-of-life. If necessary, we can assist in end-of-life disposal of the resistors.

Coated resistors are to be handled like other comparable electronic components.