HVR Series High Voltage Tubular Power Resistors
Ruthenium slurry thick film resistive element screen-printed on 95% aluminium oxide ceramic substrate
Non-inductive construction
Ten power ratings: 8W, 10W, 20W, 30W, 50W, 80W, 100W, 150W, 200W, and 300W
Maximum operating voltage 25kV to 80kV depending on power rating
Resistance range 10Ω to 1GΩ depending on power rating
Tolerance options ±1%, ±2%, ±5%, and ±10%
TCR ±50 ppm/°C to ±1000 ppm/°C
Bolt and screw end-cap terminal connections (M4 and M6 thread)
Operating temperature −55°C to +225°C
Load life ΔR ≤±(0.5%R + 0.1Ω) after 1000 hours at rated voltage
Short time overload ΔR ≤±(0.2%R + 0.1Ω) at 5 times rated power for 5 seconds
Insulation resistance ≥10 GΩ at 1000 Vdc for 1 minute
Humidity resistance ΔR ≤±(0.4%R + 0.1Ω) at 40°C, 90–95% RH for 240 hours
What are the HVR Series High Voltage Tubular Power Resistors?
The HVR series is a range of high voltage, high power tubular resistors constructed by screen-printing a ruthenium-based resistive film onto a 95% aluminium oxide ceramic substrate, sintered at high temperature to produce a stable, thermally conductive resistive element with good mechanical strength. Ten power ratings are available, spanning 8W through to 300W, with maximum operating voltages progressing from 25kV at 8W up to 80kV at 300W. The tubular ceramic body provides the physical length and surface creepage distance needed to sustain these voltages reliably in continuous service, while the ruthenium thick film delivers the stable electrical properties and long operating life characteristic of precious-metal film technology. Bolt and screw end-cap terminals in M4 and M6 thread sizes allow direct integration into chassis, busbar, and panel-wiring assemblies without additional adapters.
The resistance range covered by the HVR series extends from 10Ω to 1GΩ, with the lower-power models covering 10Ω to 500MΩ and the higher-power models from 100W upward reaching 1GΩ. Four tolerance grades are offered — ±1%, ±2%, ±5%, and ±10% — and the TCR range of ±50 to ±1000 ppm/°C allows selection of a stability grade appropriate to the application. The non-inductive construction ensures that impedance behaviour remains resistive across the frequency content of switching transients and pulsed waveforms, avoiding the voltage overshoot and energy storage effects that wirewound alternatives of comparable power rating would introduce in high voltage discharge and snubber circuits.
The HVR series is rated for continuous operation from −55°C to +225°C, and reliability is verified across four standard stress conditions. Load life drift is ΔR ≤±(0.5%R + 0.1Ω) after 1000 hours of cycled operation at rated voltage, using a 90-minutes-on, 30-minutes-off duty cycle. Short time overload drift is ΔR ≤±(0.2%R + 0.1Ω) at five times rated power for five seconds, subject to a ceiling of 1.5 times maximum continuous voltage. Humidity resistance is ΔR ≤±(0.4%R + 0.1Ω) after 240 hours at 40°C and 90–95% relative humidity, and high/low temperature cycling over −55°C to +155°C for five cycles produces drift of ΔR ≤±(0.2%R + 0.1Ω). Insulation resistance is ≥10 GΩ at 1000 Vdc. Body weights range from 26 g at the 8W rating to 492 g at 300W, reflecting the substantial ceramic mass required to sustain the highest power dissipation and voltage ratings.
HVR Series High Voltage Tubular Power Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: HVR
Resistor type: High Voltage
Description: High Voltage Tubular
Power Rating: 8W~300W
Supply voltage: 25kV~80kV
Resistance (Ω): 10~1G
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 50~1000
Applications of the HVR Series High Voltage Tubular Power Resistors
Where RARA high voltage resistors are deployed in the field.
High voltage power equipment and HVDC systems — current-limiting, discharge, and voltage-grading resistors in high voltage direct current transmission and conversion equipment operating at sustained supply voltages to 80kV, where the 300W rating accommodates the power dissipation demands of large-scale installations.
Medical CT and X-ray machines — high-power current-limiting and bleeder resistors in the kilovolt-range power supplies of computed tomography scanners and diagnostic X-ray generators, where long-term load life stability under continuous duty is a primary reliability requirement.
High voltage testing equipment and impulse generators — precisely rated discharge and damping resistors in high-potential test sets, dielectric strength testers, and Marx generator assemblies where large resistance values and high voltage standoff must be combined with high pulse-energy capability.
Electrostatic precipitators and environmental protection equipment — current-limiting and protective discharge resistors in electrostatic precipitator power supplies used for industrial air filtration and emission control, operating at tens of kilovolts in harsh industrial environments.
Particle accelerators and nuclear instrumentation power supplies — stable high-power resistors in accelerator magnet and RF cavity power supplies, beam optics bias networks, and detector high-voltage systems where voltage ratings to 80kV and sustained power dissipation are simultaneously required.
Power system protection and switchgear — voltage-grading, surge-limiting, and discharge resistors in high voltage switchgear assemblies, circuit breaker pre-insertion resistors, and transformer neutral grounding applications where chassis-mountable tubular components with screw terminals are preferred.
Industrial plasma generators and surface treatment systems — high-power current-controlling resistors in plasma cleaning, corona treatment, and dielectric barrier discharge equipment where non-inductive construction prevents transient voltage spikes from disrupting process stability.
High voltage instruments and meters — stable high-resistance divider elements and current-limiting components in kilovoltmeter assemblies, high voltage measurement bridges, and precision energy metering equipment demanding consistent resistance performance across wide operating temperature ranges.
Related Products of the HVR Series High Voltage Tubular Power Resistors
Model: HVI
Resistor type: High Voltage
Description: Thick film Tubular
Power Rating: 1W~6W
Supply voltage: 4kV~30kV
Resistance (Ω): 100k~1G
Tolerance (%): ±1
TCR (ppm/C): 25
Model: UHV
Resistor type: High Voltage
Description: High Voltage and Ohm
Power Rating: 0.5W~3W
Supply voltage: 3kV~14kV
Resistance (Ω): 1K~2G
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 25~500
Model: 400 Series
Resistor type: High Voltage
Description: Precision, Non-Inductive
Low TCR
Power Rating: 3.8W~20W
Supply voltage: 15kV~90kV
Resistance (Ω): 1k~1T
Tolerance (%): ±0.05 to ±10
TCR (ppm/C): 5, 10, 15, 25, 50, 100
Model: HVE
Resistor type: High Voltage
Description: Thick film Tubular
Power Rating: 2.5W~20W
Supply voltage: 4.8kV~45kV
Resistance (Ω): 200~10G
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C): 100
Why Choose RARA High Voltage Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Widest Voltage Range
From 1kV SMD chip types to 90kV precision planar resistors — RARA's high voltage lineup covers more of the voltage spectrum than virtually any single supplier.
02
Extreme Precision
The 400 Series delivers ±0.05% tolerance and 5 ppm/°C TCR — precision that rivals dedicated metrology components, available at high voltage ratings up to 90kV.
03
5 Form Factors
SMD, axial, radial, tubular, and planar configurations give design engineers the right package for board-level, through-hole, or chassis-mounted high voltage circuits.
04
Global Track Record
Trusted by Toshiba, Siemens, Rockwell, and Schneider Electric — deployed in medical, industrial, and telecom high voltage systems across six continents.
