GBR-403 Series High-Voltage Thick Film Resistors
Thick film resistive element on alumina ceramic substrate (Al₂O₃ — 96%)
Rated power 2W
Resistance range 100MΩ to 2GΩ; tolerance ±5% to ±20%
Maximum continuous operating voltage 40kV
Maximum voltage for 3-second pulse 60kV
TCR ±100 ppm/°C
Maximum element temperature 180°C
Designed for high-voltage applications requiring high stability and very high resistance
Alternative resistance values available on request
What are the GBR-403 Series High-Voltage Thick Film Resistors?
The GBR-403 is a 2W ultra-high-voltage thick film resistor built on a 96% alumina ceramic substrate (Al₂O₃), uniquely positioned within the GBR series by its resistance range extending into the gigaohm domain — from 100MΩ up to 2GΩ. This combination of multi-gigaohm resistance values and extreme voltage capability, with a maximum continuous operating voltage of 40kV and a three-second pulse limit of 60kV, makes the GBR-403 one of the most specialised components in the series, addressing a class of high-voltage, ultra-high-impedance circuit requirements that very few standard resistor types can satisfy simultaneously.
The available resistance range spans 100MΩ to 2GΩ, with a tolerance of ±5% to ±20% reflecting the inherent manufacturing challenges of achieving consistent very high resistance on a compact ceramic substrate while maintaining the dielectric integrity demanded by 40kV to 60kV operation. The temperature coefficient of resistance is ±100 ppm/°C, and the maximum element temperature of 180°C defines the upper thermal boundary of safe resistor operation independently of the ambient temperature environment. Rated continuous power dissipation is 2W, and alternative resistance values outside the standard range are available on request to accommodate specific circuit impedance requirements.
The alumina ceramic substrate provides the exceptional dielectric strength and mechanical stability necessary to sustain reliable operation across the full voltage range of the GBR-403, including repeated exposure to transient events up to 60kV. As a thick film component, the GBR-403 delivers the superior long-term resistance stability and low noise performance that high-impedance, high-voltage circuits demand — qualities especially critical at gigaohm resistance levels, where even small absolute changes in resistance value or elevated noise currents can significantly affect the accuracy and reliability of the circuits in which the component operates.
GBR-403 Series High-Voltage Thick Film Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: GBR-403
Resistor type: High Voltage
Description: Thick film
Power Rating: 2W
Resistance (Ω): 100M~2G
Tolerance (%): ±5, ±10, ±20
TCR (ppm/C): 100
Applications of the GBR-403 Series High-Voltage Thick Film Resistors
Where RARA high voltage resistors are deployed in the field.
Ultra-high-voltage power supply circuits — gigaohm-range bleeder, equalisation, and voltage divider resistors for continuous operation at 40kV in industrial and scientific DC power supplies
High-energy pulsed power systems — ultra-high-impedance damping and isolation resistors in circuits subject to 60kV three-second transient events including Marx generators and pulse-forming networks
Medical imaging and radiotherapy accelerators — gigaohm-range bias and protection resistors in X-ray generator, CT scanner, and linear accelerator high-voltage power systems operating at multi-kilovolt levels
Particle accelerator and physics research instrumentation — ultra-high-impedance resistors for beam optics, deflection plate bias, and electrostatic lens supply circuits requiring stable gigaohm values at high voltage
Nuclear instrumentation and ionisation chamber systems — gigaohm-range bias and guard resistors for ionisation current measurement in radiation monitoring and dosimetry equipment operating at elevated voltages
Electrostatic and corona discharge equipment — ultra-high-resistance current-limiting resistors for electrostatic generators, Van de Graaff supplies, and high-voltage ioniser circuits
Impulse and high-voltage withstand test systems — ultra-high-impedance isolation and protection resistors in test equipment rated for 60kV pulse stress
High-voltage laboratory and standards equipment — gigaohm reference and working resistors for insulation resistance measurement, leakage current testing, and high-impedance voltage sensing
Photomultiplier tube and single-photon detector bias circuits — ultra-high-resistance dynode chain and anode load resistors in high-voltage photon detection and spectroscopy systems
Cable and transformer insulation test equipment — gigaohm-range current-limiting and protection resistors in partial discharge, insulation resistance, and dielectric loss measurement systems operating at multi-kilovolt test voltages
Related Products of the GBR-403 Series High-Voltage Thick Film Resistors
Model: GBR-351
Resistor type: High Voltage
Description: Thick film bleeder
Power Rating: 2W
Resistance (Ω): 45~256M
Tolerance (%): ±3, ±5
TCR (ppm/C): 100
Model: GBR-390
Resistor type: High Voltage
Description: Divider
Power Rating: 4W
Resistance (Ω): 1~40M
Tolerance (%): 0.1, ±5
TCR (ppm/C): 40
Model: GBR-391
Resistor type: High Voltage
Description: Thick film divider
Power Rating: 13W
Resistance (Ω): 1~40M
Tolerance (%): ±0.1~±5
TCR (ppm/C): 40
Model: GBR-395
Resistor type: High Voltage
Description: Thick film
Power Rating: 1W
Resistance (Ω): 0.1~500M
Tolerance (%): ±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.
