GBR-250 Series High-Voltage Thick Film Resistors
Thick film resistive element on alumina ceramic substrate (Al₂O₃ — 96%)
Rated power 2W
Resistance range 0.1Ω to 500MΩ; tolerance ±10% to ±20%
Maximum continuous operating voltage 23kV
Maximum voltage for 3-second pulse 50kV
TCR ±100 ppm/°C
Operating temperature −20°C to +70°C
Designed for high-voltage applications requiring high stability and resistance
Alternative resistance values available on request
What are the GBR-250 Series High-Voltage Thick Film Resistors?
The GBR-250 is a 2W ultra-high-voltage thick film resistor constructed on a 96% alumina ceramic substrate (Al₂O₃), purpose-built for the most demanding high-voltage circuit applications within the GBR series. Its defining capability is an exceptional pulsed voltage rating of 50kV for three-second durations, with a continuous maximum operating voltage of 23kV — figures that place the GBR-250 in a specialist category suited to pulse-power, high-energy discharge, and kilovolt-range instrumentation environments where standard high-voltage resistors would be inadequate.
The available resistance range extends from 0.1Ω to 500MΩ, with typical standard values spanning 10MΩ to 500MΩ at a tolerance of ±10%. A wider tolerance band of ±20% is available for certain values, reflecting the manufacturing challenges associated with achieving very high resistance on a compact ceramic substrate while maintaining the dielectric integrity required for multi-kilovolt operation. Alternative resistance values outside the standard range are available on request. The temperature coefficient of resistance is ±100 ppm/°C, and rated continuous power dissipation is 2W across the operating temperature range of −20°C to +70°C.
Built on the proven thick film ceramic platform shared across the GBR high-voltage series, the GBR-250 delivers the inherent stability and low-noise characteristics of thick film technology at resistance values that reach deep into the megohm range. The alumina ceramic substrate provides the dielectric strength and thermal stability necessary to sustain repeated high-energy pulse events without mechanical or electrical degradation, making the GBR-250 particularly well suited to circuits that combine very high impedance with extreme transient voltage stress — a combination that would rapidly compromise resistors built on polymer or lower-grade ceramic substrates.
GBR-250 Series High-Voltage Thick Film Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: GBR-250
Resistor type: High Voltage
Description: Thick film
Power Rating: 2W
Resistance (Ω): 0.1~500M
Tolerance (%): ±10, ±20
TCR (ppm/C): 100
Applications of the GBR-250 Series High-Voltage Thick Film Resistors
Where RARA high voltage resistors are deployed in the field.
Ultra-high-voltage power supply circuits — multi-megohm voltage divider and bleeder networks operating up to 23kV continuously
Pulsed power and energy storage systems — discharge damping and waveshaping resistors rated for 50kV transient events
High-voltage laboratory and standards equipment — precision voltage scaling and probe resistors for kilovolt-range measurement
Medical imaging and radiotherapy systems — X-ray generator and linear accelerator high-impedance bias and protection resistors
Particle physics and accelerator research — high-voltage resistor chains and detector bias networks in the megohm range
Electrostatic and corona discharge equipment — ioniser, precipitator, and air treatment supply resistors operating at multi-kilovolt levels
Impulse and surge test generators — waveshaping, front-of-wave, and tail resistors in lightning and switching impulse circuits rated to 50kV
Laser excitation and plasma generation power supplies — current-limiting and discharge resistors for pulsed high-energy systems
Nuclear instrumentation and radiation detection — high-impedance bias resistors for photomultiplier tubes and ionisation chamber supplies
High-voltage cable and insulation testing equipment — series protection and current-limiting resistors in dielectric withstand and partial discharge test systems
Related Products of the GBR-250 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.
