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1016 Delaum Road • St. Marys, PA 15857-1059 • Phone: (814) 781-7679 • Fax: (814) 834-9370
Rings become part of lightning arrestors, small heaters, automotive horn button resistors, thermostat controls, and other resistors where center mounting is requred.

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Non-Inductive Ceramic and Organic Industrial Resistors

Two distinct types of materials are used to manufacture non-inductive resistors: Ceramic and Organic. Special purpose and industrial resistors are used to dissipate or reduce electrical energy and cover a wide range of applications including high-voltage and high-energy surges while remaining non-inductive. Large ceramic resistors are the perfect answer for use in circuit breakers. Resistors inserted at high-voltage load points, such as spark plugs, distributor points, or coil leads, will limit spurious high frequency signals from being emitted or carried on transmission lines.

A Ceramic Resistor consists of carbon/graphite particles dispersed in a ceramic matrix. Ceramic resistors are thermally stable and chemically inert. They are designed to withstand adverse temperatures and environmental conditions. Ceramic resistors can withstand high-energy dissipation at high temperatures and high voltage levels such as those encountered in surge arrestors, dummy loads, RFI suppressors, circuit breakers, etc. Ceramic bonded high-power resistors may be molded or extruded. When molded, thickness can be varied; extrusion offers flexibility for assorted lengths. Standard forms of ceramic resistors are discs, sleeves, and rings in diameters up to 5", and rods in lengths up to 16". While these are standard forms, all special purpose resistors are designed to customer specifications.

Ceramic Resistor Material - Chemically inert which can withstand high energy, high voltages at high temperatures such as those encountered in the protection of high voltage surge equipment, discharge banks and in high frequency radiation suppression. Electrical characteristics are as follows:

Resistivity Range: 0.8 to 4,000Ohm-in
2 to 10,000 Ohm-cm
Maximum Steady State Power Density: 12 watts/in3
0.75 watts/cm3
Maximum Transient Energy Density: 4,920 joules/in3
300 joules/cm3
Maximum Voltage Gradient : 10 kV/in
4 kV/cm
Maximum Rate of Power Injection: 150,000 watts/sec/in3
Maximum Rate of Current Injection: 1,000 amps/in2-Contact Area
Maximum Operating Temperature: 2500º C
Voltage Coefficient: 0.03%/volt
Temperature Coefficient : - 0.13%/ºC
Heat Dissipation: 2.86 watts/in2


An Organic Resistor consists of carbon/graphite particles dispersed throughout a thermally cured organic resin, which also contains mineral fillers. Major uses involve those situations requiring resistance values with medium heat dissipation, or where high energy levels are momentary. Organically bonded resistors are manufactured from a powder mix, so any size or shape that can be tooled may be produced. Organic resistors are available in standard forms in smaller, more economical sizes.

Organic Resistor Material - offers a wider resistance range for those applications where only medium steady state heat dissipation is required, or where high energy pulses are of relatively short duration, as in automotive noise suppression of lightning arrestors. Electrical characteristics are as follows:

Resistivity Range: 0.04 to 800,000,000 Ohm-in
0.1 to 2,000,000,000 Ohm-cm
Maximum Steady State Power Density: 10 watts/in3
0.60 watts/cm3
Maximum Transient Energy Density: 100 joules/in3
6 joules/cm3
Maximum Voltage Gradient : 8 kV/in
3 kV/cm
Maximum Operating Temperature: 120º C
Voltage Coefficient: 0.03%/volt
Temperature Coefficient : - 0.13%/ 0C
Heat Dissipation: 2.86 watts/in2


Contact U. S. Resistor for assistance in applying ceramic or organic resistors to your specific application.