RQO Series High Power Capacitor Discharge Cement Resistors
Cement-encased construction with glass fibre, ceramic or metal oxide film resistive core
10W continuous power rating
Short-time overload rating of 10× rated power for 5 seconds
Resistance range 0.3Ω to 75kΩ depending on core type
Tolerance ±5% (R>1Ω) and ±10% (R≤1Ω)
TCR ±490ppm/°C maximum
Operating temperature range −25°C to +155°C
Dielectric withstanding voltage AC 1500V for 1 minute
Insulation resistance 20MΩ minimum at DC 500V
Axial lead format with fixed body dimensions
What are the RQO Series High Power Capacitor Discharge Cement Resistors?
The RQO is a 10W cement resistor designed specifically for capacitor discharge and high-power pulse applications. Cement resistors of this type encase the resistive element in a non-combustible, thermally stable cement compound that provides both mechanical protection and a degree of thermal mass, allowing the device to absorb short-duration energy bursts well in excess of its continuous rating. The RQO is rated for a short-time overload of 10 times rated power — 100W — for 5 seconds, making it particularly suited to capacitor discharge circuits where the energy stored in a capacitor bank is released rapidly through the resistor on each operating cycle.
Three core technologies are available within the RQO range to cover different resistance requirements. Glass fibre core (GC) variants cover 0.5Ω to 1.5kΩ, ceramic core (CC) variants span 0.3Ω to 10kΩ, and metal oxide film (MO) variants extend the upper range to 75kΩ. This tiered approach allows the most appropriate resistive technology to be selected for the impedance required, with the glass fibre and ceramic core types suited to lower-resistance, higher-current discharge duties and the metal oxide film type addressing higher-resistance applications. Tolerance is ±5% for resistances above 1Ω and ±10% for resistances at or below 1Ω, in line with the practical tolerance achievable at very low resistance values in this construction type.
The temperature coefficient of resistance is specified at ±490ppm/°C maximum, which is consistent with the cement resistor construction and acceptable for the discharge and protection roles this series is designed to fulfil. Operating temperature range is −25°C to +155°C. Moisture resistance is qualified at ±[3%+0.05Ω] change after 500 hours at 40°C and 95% RH with DC 100V applied, and thermal shock endurance is ±[2%+0.05Ω] through the rated power and −25°C cycle. Moisture load life stability is ±[3%+0.05Ω] and dry load life stability is ±[7%+0.05Ω] (metal oxide film ±15%) after 1000 hours of 90-minutes-on/30-minutes-off cycling at rated power.
The RQO body measures 48mm in length by 13mm in diameter, with axial leads for through-hole mounting. Dielectric withstanding voltage is AC 1500V for 1 minute, and insulation resistance is guaranteed at 20MΩ minimum under DC 500V. Solderability is guaranteed at 75% coverage minimum. The fixed body dimensions and standardised lead format make the RQO straightforward to integrate into existing through-hole PCB layouts and chassis-mounted wiring configurations.
RQO Series High Power Capacitor Discharge Cement Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: RQO
Resistor type: Power film
Description: High power capacitor discharge
Power Rating: 10W
Resistance (Ω): 0.5~75k
Tolerance (%): ±5, ±10
TCR (ppm/C): 490 max.
Applications of the RQO Series High Power Capacitor Discharge Cement Resistors
Where RARA metal clad resistors are deployed in the field.
-Capacitor discharge circuits — controlled energy release from capacitor banks in power electronics
-Power supply bleed and safety discharge resistors — draining stored charge after power-off
-Inrush current limiting and soft-start circuits — absorbing initial surge energy at power-up
-Snubber and transient suppression networks — clamping voltage spikes across switching devices
-Motor drive and inverter protection circuits — DC bus discharge and overvoltage damping
-UPS and battery backup systems — controlled discharge and load testing resistors
-Industrial power supplies and control panels — through-hole high-power resistors in rugged environments
-Medical and laboratory equipment power circuits — reliable pulse load and discharge components
-High-voltage test equipment — discharge and current-limiting resistors for capacitor bank management
-HVAC and industrial motor control — braking and energy absorption in relay-switched drive circuits
Related Products of the RQO Series High Power Capacitor Discharge Cement Resistors
Model: RTS-01
Resistor type: Power film
Description: Heatsinkable thick film
Power Rating: 100W
Resistance (Ω): 0.1~1M
Tolerance (%): ±5, ±10
TCR (ppm/C): 100
Model: TNP25, TNP45
Resistor type: Power film
Description: SMD surge protection
Power Rating: 25W, 45W
Resistance (Ω): 0.1~51k
Tolerance (%): ±1
TCR (ppm/C): 100
Model: TNP10/20S/50U
Resistor type: Power film
Description: Power thin film
Power Rating: 20W, 35W, 50W
Resistance (Ω): 0.02~510k
Tolerance (%): ±1, ±5
TCR (ppm/C): 50, 100, 250
Model: TNP50S, TNP100S
Resistor type: Power film
Description: Power thin film, TO227
Power Rating: 50W, 100W
Resistance (Ω): 0.02~510k
Tolerance (%): ±1, ±5
TCR (ppm/C): 50, 100, 250.
Why Choose RARA Metal Clad Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Automotive Qualified
AEC-Q200 tested models and IATF 16949 certification for EV and automotive powertrain applications. Trusted by GM Korea, Tesla, and Proterra.
02
STEP Files Included
3D STEP files available for core models, supporting ECAD/MCAD integration and thermal management simulation in your design workflow.
03
Wide Power Range
A single product family spanning 10W to 8.5kW means you can source across a project from one qualified, certified supplier.
04
Global Track Record
Deployed by Siemens, Rockwell, Toshiba, Schneider Electric, LG, and Hanwha — a customer list built on decades of consistent performance.
