GBR-391 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 13W
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 ratio (TWR) ±40 ppm/°C
Maximum continuous operating voltage 11kV; maximum voltage for 5-second pulse 50kV
Operating temperature −25°C to +70°C
Alternative resistance values and tolerances down to ±0.1% available on request
What are the GBR-391 Series High-Voltage Thick Film Resistive Dividers?
The GBR-391 is the high-power variant of the GBR resistive divider series, built on a 96% alumina ceramic substrate (Al₂O₃) with through-hole leads for direct PCB integration. Sharing the same precision dual-element architecture and standard 1:1000 and 1:100 voltage division ratios as the GBR-390, the GBR-391 is distinguished by its substantially higher rated power of 13W — more than three times that of the GBR-390 — making it the preferred choice wherever continuous high-voltage monitoring or division must be maintained in circuits where significant power dissipation through the divider network is unavoidable.
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 configuration. Tolerance options range from ±5% down to ±0.1%, covering both general monitoring and precision measurement applications within a single product series. The temperature coefficient of resistance ratio (TWR) of ±40 ppm/°C matches that of the GBR-390, ensuring that the voltage division ratio between R1 and R2 remains stable across the full operating temperature range of −25°C to +70°C. The maximum continuous operating voltage is 11kV, with a five-second pulse voltage limit of 50kV providing resilience against high-energy transient overvoltage events.
The 13W power rating of the GBR-391 enables it to be used in divider applications where lower-impedance circuit configurations, higher operating voltages relative to the total resistance, or elevated ambient temperatures would exceed the thermal limits of a 4W component such as the GBR-390. The alumina ceramic substrate provides the dielectric integrity and mechanical robustness required to withstand both continuous operation at 11kV and transient stress up to 50kV, while the thick film construction delivers the long-term ratio stability essential in precision monitoring and control feedback loops. Alternative resistance values and tolerances are available on request to accommodate non-standard division requirements.
GBR-391 Series High-Voltage Thick Film Resistive Dividers Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
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
Applications of the GBR-391 Series High-Voltage Thick Film Resistive Dividers
Where RARA high voltage resistors are deployed in the field.
High-power high-voltage power supply monitoring — precision 1:1000 and 1:100 dividers for continuous voltage sensing and closed-loop regulation feedback in kilovolt-range supplies where significant divider dissipation is expected
Industrial high-voltage rectifier and converter systems — scaled voltage feedback dividers in high-current rectifier outputs and DC bus monitoring circuits requiring 13W continuous power handling
Medical imaging and radiotherapy accelerator power supplies — high-power voltage sensing dividers for anode voltage regulation and dose control in X-ray generators and linear accelerator systems
Particle accelerator and physics research equipment — stable high-power ratio dividers for beam optics supply monitoring and interlock feedback in high-current high-voltage power systems
High-voltage laboratory and calibration equipment — reference and working standard dividers providing traceable scaled outputs for calibration of high-voltage instruments across a wide power dissipation range
Electrostatic process equipment — high-power voltage sensing dividers for real-time monitoring and regulation of electrostatic coating, precipitation, and separation systems operating at elevated continuous power levels
Power converter overvoltage protection circuits — scaled voltage dividers driving protection comparators and supervisory controllers in high-voltage DC bus systems with demanding continuous power requirements
Pulsed laser and plasma power supply regulation — high-power dividers for continuous output voltage monitoring and closed-loop control in high-energy excitation supplies subject to 50kV transient events
Telecommunications and broadcast transmitter systems — high-power anode and collector supply voltage sensing dividers for automatic level control in high-current RF power amplifiers
Capacitor bank charging and energy storage systems — high-power voltage monitoring dividers for accurate charge state measurement and charge termination control in high-current high-voltage charging circuits
Related Products of the GBR-391 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.
