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Bulk Ceramic Resistors - High Voltage Resistors

For difficult design problems our non-inductive bulk ceramic resistors offer a unique solution. This family of rugged, non-inductive bulk ceramic resistor products spans a wide range, from axial and radial leaded PCB mounted resistors to our Multi-Mega-Joule custom assemblies. We can meet the high voltage/energy requirements of the most demanding applications.

These High Voltage Resistors, Non Inductive resistors, Ceramic Carbon Linear Resistors are manufactured using a specific mixture of clays, alumina and carbon. Once mixed the material is granulated and pressed into the specific shape needed, with diameters ranging from 3 to 152mm. This pressed mixture is then fired in a tunnel kiln with a precisely controlled reducing atmosphere. This produces a bulk ceramic Carbon resistor which is 100% active material, and therefore of minimum size. Typically aluminum is then flame sprayed onto the flat surfaces of the Ceramic Resistor to provide reliable electrical contact, and an anti-track coating is applied to the edges to improve dielectric withstand. A wide variety of geometries in a wide resistivity range, with constant mechanical strength. These ceramic resistors are robust, having good compression specifications and the ability to absorb transmitted mechanical shock, as long as direct impact is avoided.

U series

● High Surge Energy
● Non-Inductive
● Compact Size

U series compact resistors offer high a surge energy rating, in a low-cost, epoxy-coated, radial leaded form factor. The U-Series is designed to provide an optimum solution to many Power Electronics applications; which include soft starting DC link capacitors (capacitor discharging and charging) for SMPS (Switch Mode Power Supplies), ASD’s (motor drives), and UPS. Other circuit applications are also suited such as: surge limiting, and pulse shaping. Because they are inherently non-inductive and have the ability to withstand transient high voltage impulses, they are also appropriate to over-voltage protection and crowbar capacitor charge / discharge applications. In pulsed applications, these compact resistors distribute the energy uniformly throughout their structure, resulting in low thermal stress. The consequence is increased reliability, and reduced size, compared to other resistor types. High-temperature, solvent-resistant epoxy coating allows operation in almost any environment.

The U- Series of high energy surge Resistors uses the same process as our other ceramic resistors using a specific mixture of clays, alumina and carbon. Once mixed the material is granulated and pressed into a specific shape needed. This pressed mixture is then fired in a tunnel kiln with a precisely controlled reducing atmosphere. This produces a bulk ceramic Carbon resistor which is 100% active material, and therefore of minimum size.

RT series

● High Surge Energy
● Non-Inductive
● Replace Carbon Composition Resistor

These are non-inductive resistor, and are ideal for circuitry associated with surges, high peak power or high energy. These frequently replace multi-watt carbon composition resistors which can be difficult to source or are obsolete. RT series provide superior performance in high voltage power supplies, R-C snubber circuits, and inrush limiters. For pulsed applications, these compact non-inductive resistors distribute the energy uniformly throughout their structure, resulting in low thermal stress. The consequence is increased reliability, and in many cases reduced size, compared to wirewound or film types. The solvent-resistant epoxy coating allows operation in almost any environment with out the moisture absorption concerns of carbon composition resistors.

These high surge energy resistors use the same process as our other ceramic resistors using a specific mixture of clays, alumina and carbon. Once mixed the material is granulated and pressed into a specific shape needed. This pressed mixture is then fired in a tunnel kiln with a precisely controlled reducing atmosphere. This produces a bulk ceramic Carbon resistor which is 100% active material, and therefore of minimum size.

C series
● Extreme High Voltage ● Non-Inductive ● Circuit Board Mounting	Epoxy coated, radial lead resistors can absorb high energy at voltages up to 44kV. They are ideal for high voltage applications requiring non-inductance, as in pulse forming and fast crowbars. These are commonly used in high voltage test equipment and cardiac defibrillators. Other applications include high protection resistor surge voltages.

The C- Series of high voltage resistors uses the same process as our other ceramic resistors using a specific mixture of clays, alumina and carbon. Once mixed the material is granulated and pressed into a specific shape needed. This pressed mixture is then fired in a tunnel kiln with a precisely controlled reducing atmosphere. This produces a bulk ceramic Carbon resistor which is 100% active material, and therefore of minimum size.

LRW series
	Cement cased wirewound and metal oxide film resistors range from 5 watts to 40 watts in standard and non inductive types. Styles are available for board or chassis mounting

V Series
● High Surge Energy ● Flame Retardant Package ● 250v AC Thermal Cutoff	V Series is fusible resistors offer high inrush energy with higher average power rating for repetitive operation. It incorporates a thermal cutoff device to ensure safe disconnect under circuit fault conditions.

The high-temperature, flame-retardant DAP case with cement fill is designed to provide a graceful failure and opening of the thermal cutoff upon electrical fault. The thermal cutoff can interrupt 10A @ 250vac. Two configurations are offered, a two-lead device with integrated series fuse, and a four-lead device with 5kV isolation between the fuse and the independent resistor.

High Energy Disk

● High Surge Energy
● Extremely High Voltage
● Non-Inductive

High Energy Disk resistors provide unequaled performance in high energy and high voltage applications, up to 110kJ per disk. These non-inductive, ceramic composite resistors are designed for pulse shaping, crowbar, capacitor charge / discharge for multi-kilo-joule (mJ), and high voltage applications Disk resistors can be heat sink mounted for high average power requirements. Applications needing low inductance and extremes of voltage and energy are well suited to these parts.

These resistors distribute energy uniformly throughout their structure for low thermal stress. The standard, high-temperature silicone coating enhances high voltage performance in air. Optional configurations optimize performance in other gaseous or fluid dielectrics. Pulsed power systems are ideal applications.

Custom Assemblies
● Extreme Energy, Power, Voltage ● Engineered to your needs ● Rapid Design Turnaround ● High Power Resistors	High power resistors assemblies integrate multiple ceramic resistor elements to meet especially challenging requirements with an economic and flexible solution. Disks can be assembled into high power resistor assemblies which are able handle energies to megajoules, average energy to hundreds of kilowatts, and voltage to hundreds of kV.

Using stock and pre-engineered components we can provide a packaged economical solution to your demanding resistor applications in voltage clamping, capacitor charge and dump, high power snubbers and high voltage pulsed power. Other applications are for high protection resistor surge voltages. Assembled voltage and energy surge ratings are the sum of the individual disk ratings.

Ceramic carbon resistors can be offered separately, in matched sets or ready assembled high power resistors for ease of installation, depending on the application.

Standard ceramic resistor assemblies include the following components:

• Glass Fiber Tie Rod for disk mounting
• Aluminum Hexagon End Stops, pinned at either end.
• Disk Springs providing compressive mounting force
• Insulated Stand Offs (Glastic)
• Aluminum Terminals for electrical contact can

Rod and Tube

● High Voltage
● Non-Inductive
● Higher P avg

Rod and Tube style ceramic resistors are used in circuits requiring high voltage and non-inductance with surge energy. Select for higher average power, such as R.F. combiners, De-Qing, dummy loads, transmitters and modulators. These are used where the tube configuration provides more effective convection cooling. Other applications include: Anti Parasitic Elements in the grid and anode circuits of power valves in induction heaters.

We have direct crosses to Globar and Kanthal Globar parts

The standard termination is a metalized ferrule. Alternatives such as radial tabs and high voltage ferrules allow for mounting options or enhanced performance. Optional coatings are available to optimize performance in air, oil or other dielectrics.

Ground Sticks

These Safety Ground Sticks have an integral array of High Energy Disk resistors which offer a secure, reliable means to discharge potentially lethal energy from HV equipment. These Ground sticks are custom configured to your application, with voltage ratings exceeding 100kV and energy dissipation exceeding 100kJ.

Our vast experience
● Discharge potentially lethal energy
● Voltage ratings exceeding 100kV
● Energy dissipation exceeding 100kJ

Ground Sticks