GBR-390 Series High-Voltage Thick Film Resistive Dividers
Dual thick film resistive elements (R1 and R2) on alumina ceramic substrate (Al₂O₃ — 96%) with through-hole leads
Rated power 4W
R1 resistance range 1MΩ to 40MΩ; R2 defined as R1/1000 or R1/100
Standard voltage division ratios 1:1000 and 1:100
Tolerance ±0.1% to ±5%
Temperature coefficient of resistance (TWR) ±40 ppm/°C
Maximum continuous operating voltage 14kV; voltage limit for 5-second pulse 40kV
Operating temperature −25°C to +70°C
Alternative resistance values and tolerances down to ±0.1% available on request
What are the GBR-390 Series High-Voltage Thick Film Resistive Dividers?
The GBR-390 is a precision high-voltage resistive divider built on a 96% alumina ceramic substrate (Al₂O₃) with through-hole leads for PCB mounting, representing a significant step beyond the bleeder-oriented GBR-350 and GBR-351 series into the domain of precision voltage scaling and measurement. Unlike general-purpose high-voltage resistors, the GBR-390 integrates two carefully matched resistive elements — R1 and R2 — in a fixed ratio of either 1:1000 or 1:100, enabling accurate and stable proportional representation of a high-voltage signal as a safe low-voltage output suitable for monitoring, feedback, and measurement instrumentation.
The R1 element spans 1MΩ to 40MΩ, with R2 defined as either R1 divided by 1000 or R1 divided by 100 depending on the selected ratio variant. Tolerance options range from ±5% down to ±0.1%, allowing the GBR-390 to be specified across a wide spectrum from cost-sensitive general monitoring applications through to demanding precision measurement requirements. The temperature coefficient of resistance ratio (TWR) of ±40 ppm/°C is notably tighter than that of the broader GBR high-voltage series, ensuring that the division ratio between R1 and R2 remains stable over the operating temperature range of −25°C to +70°C — a critical requirement wherever the scaled output voltage must accurately track the high-voltage input across varying thermal conditions.
Rated at 4W continuous power dissipation, the GBR-390 offers a higher power handling capability than many compact high-voltage divider components, with a maximum continuous operating voltage of 14kV and a five-second voltage limit of 40kV providing resilience against transient overvoltage events. The through-hole lead configuration allows direct PCB integration alongside associated measurement and control circuitry, simplifying assembly and ensuring a secure mechanical connection in the demanding environments typical of high-voltage power conversion and instrumentation equipment. Alternative resistance values and tolerances are available on request to accommodate non-standard division ratios and specific circuit requirements.
GBR-390 Series High-Voltage Thick Film Resistive Dividers Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: GBR-390
Resistor type: High Voltage
Description: Divider
Power Rating: 4W
Resistance (Ω): 1~40M
Tolerance (%): 0.1, ±5
TCR (ppm/C): 40
Applications of the GBR-390 Series High-Voltage Thick Film Resistive Dividers
Where RARA high voltage resistors are deployed in the field.
High-voltage power supply output monitoring — precision 1:1000 and 1:100 resistive dividers for accurate voltage sensing and closed-loop regulation feedback in kilovolt-range DC supplies
Medical imaging and X-ray generator control circuits — high-voltage scaling dividers providing proportional low-voltage feedback signals for dose control and anode voltage regulation
High-voltage laboratory instrumentation — precision voltage dividers for direct metering of kilovolt-range signals with standard low-voltage measurement equipment
Particle accelerator and physics research systems — stable ratio dividers for beam optics voltage monitoring and interlock feedback in high-voltage power supplies
Industrial electrostatic process equipment — voltage sensing dividers for real-time monitoring and control of electrostatic coating, precipitation, and separation systems
High-voltage test and calibration equipment — reference dividers providing traceable scaled voltage outputs for calibration of high-voltage measuring instruments and transducers
Power converter and inverter protection circuits — overvoltage detection dividers providing scaled signals to protection comparators and supervisory controllers in high-voltage DC bus systems
Laser and plasma power supply regulation — high-voltage dividers for continuous output voltage monitoring and closed-loop control in pulsed and CW high-voltage excitation supplies
Telecommunications and broadcast transmitter systems — precision anode and collector supply voltage sensing dividers for automatic level control and protection in high-power RF amplifiers
Energy storage and capacitor charging systems — voltage monitoring dividers for real-time charge state measurement and charge termination control in high-voltage capacitor bank charging circuits
Related Products of the GBR-390 Series High-Voltage Thick Film Resistive Dividers
Model: GBR-200
Resistor type: High Voltage
Description: Thick film
Power Rating: 1W
Resistance (Ω): 0.1~500k
Tolerance (%): ±10
TCR (ppm/C): 100
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
Model: GBR-253
Resistor type: High Voltage
Description: Thick film
Power Rating: 1.7W
Resistance (Ω): 0.1~500M
Tolerance (%): ±10, ±20
TCR (ppm/C): 100
Model: GBR-350
Resistor type: High Voltage
Description: Thick film
Power Rating: 2W
Resistance (Ω): 50~220M
Tolerance (%): ±3, ±5
TCR (ppm/C): 10
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.
