RQL Series Ceramic Encased Wire Wound Resistors
Core options — Glass fibre core (GC), ceramic core (CC), and metal oxide film (MO)
Power ratings — 10W, 15W, 20W, 25W, 30W, and 40W
Resistance range — 0.3Ω to 100kΩ depending on core type and power rating
Tolerance — ±5% for resistance values above 1Ω; ±10% for values at or below 1Ω
Temperature coefficient of resistance — ±260ppm/°C for GC and CC cores; ±400ppm/°C for MO variants
Operating temperature range — −25°C to +155°C
Dielectric withstanding voltage — AC 1500V for 1 minute
Insulation resistance — 20MΩ minimum at DC 500V
Short time overload — 10 times rated power for 5 seconds
Terminal styles — Axial lead with mounting bracket (G), tab mount (T), bridge/clip mount (B), and snap-in (S)
What are the RQL Series Ceramic Encased Wire Wound Resistors?
The RQL is a range of higher-power ceramic encased wire wound resistors designed for demanding power dissipation duties in industrial electronics and power conversion equipment. Extending from 10W up to 40W, the series occupies a higher power tier than the RQB family while retaining the same fundamental ceramic encased construction and wire wound resistive element. The ceramic housing provides robust mechanical protection and electrical isolation rated to AC 1500V for one minute, making the RQL suitable for deployment in line-voltage circuits and high-voltage industrial environments where reliable insulation between the resistive element and the mounting surface is required.
Three core constructions address different regions of the resistance range. The glass fibre core (GC) variant handles lower resistance values, beginning from 0.5Ω in the 10W rating, and is suited to high-current applications where a low and stable resistance is required. The ceramic core (CC) construction extends coverage into the mid-range, up to 15kΩ at 20W. The metal oxide film (MO) variant reaches the highest resistances in the series, up to 100kΩ, with a temperature coefficient of ±400ppm/°C compared to the tighter ±260ppm/°C of the wound core types. At higher power ratings of 25W, 30W, and 40W, only the glass fibre core construction is offered, reflecting the more specialised high-current, low-resistance focus of those variants. Tolerance is ±5% for all values above 1Ω and ±10% at or below 1Ω.
Reliability under sustained and cyclic loading is confirmed by a 500-hour load life test and a 500-hour moisture resistance test, with defined resistance drift limits for both. A short-time overload rating of ten times rated power for five seconds confirms suitability for circuits subject to transient surges. The operating range of −25°C to +155°C covers the majority of industrial installation conditions without derating. Thermal shock testing at rated power cycling confirms dimensional and electrical stability across temperature extremes.
Four mounting configurations are available to accommodate the different mechanical requirements of the higher power ratings. The G style uses a conventional axial lead format with a mounting bracket for chassis or panel attachment, available across 10W to 40W. The T style provides a tab-mount format suited to compact vertical or flat-panel mounting. The B style uses a bridge or clip mount for secure attachment to heatsinks or chassis walls, and the S style provides a snap-in variant for fast assembly. Body dimensions scale progressively with power rating to maintain safe surface temperatures at full rated dissipation, with body lengths ranging from 48mm at 10W up to 90mm at 40W.
RQL Series Ceramic Encased Wire Wound Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: RQL
Resistor type: Wire wound
Description: Ceramic encased
Power Rating: 10W~40W
Resistance (Ω): 0.3~100k
Tolerance (%): ±5, ±10
TCR (ppm/C): 260, 400
Applications of the RQL Series Ceramic Encased Wire Wound Resistors
Where RARA wire wound resistors are deployed in the field.
The RQL series is suited to industrial and commercial power electronics applications requiring ceramic encased through-hole resistors capable of continuous dissipation from 10W to 40W. Typical uses include braking and dynamic discharge resistors in variable speed motor drives and servo amplifiers, DC bus bleed and pre-charge resistors in inverters and frequency converters
Load and dummy resistors in UPS and power conditioning systems, snubber and overvoltage clamp resistors in switch-mode power supplies and DC-DC converters, inrush-current limiting resistors in rectifier front-end circuits, current-sharing and balancing resistors in parallel-connected power stages, protective series resistors in high-voltage relay driver and solenoid circuits, and discharge resistors in capacitor bank assemblies.
The combination of robust ceramic enclosure, high dielectric withstanding voltage, and wide power rating range also makes the RQL well suited to use as test load resistors in power supply and battery charger test equipment, as well as in renewable energy power conditioning systems and industrial automation panels where reliable long-term performance under repetitive thermal cycling is required.
Related Products of the RQL Series Ceramic Encased Wire Wound Resistors
Model: RQA
Resistor type: Wire wound
Description: Ceramic encased
Power Rating: 5W~20W
Resistance (Ω): 0.1~100k
Tolerance (%): ±5, ±10
TCR (ppm/C): 260, 400
Model: RQR
RResistor type: Wire wound
Description: Ceramic encased
Power Rating: 2W~12W
Resistance (Ω): 0.1~75k
Tolerance (%): ±5, ±10
TCR (ppm/C): 260, 400
Model: RQR15~40
Resistor type: Wire wound
Description: Ceramic encased
Power Rating: 15W~40W
Resistance (Ω): 0.01~54k
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 (max.)
Model: RQB
Resistor type: Wire wound
Description: Ceramic encased
Power Rating: 5W~20W
Resistance (Ω): 0.1~100k
Tolerance (%): ±5, ±10
TCR (ppm/C): 260, 400
Why Choose RARA Wire Wound Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Widest Design Range
From 0.5W precision types to 12kW edge wound assemblies — one wire wound product family covering precision, ceramic-encased, fusible, non-flammable, and high-power variants.
02
Precision Available
The PWR series delivers ±0.1% tolerance and TCR as low as 20 ppm/°C — precision wire wound performance for instrumentation and measurement circuits.
03
Automotive Qualified
The AQL ceramic-encased series is AEC-Q200 qualified for automotive-grade reliability in EV battery management, HVAC, and powertrain applications.
04
Global Track Record
Trusted by Siemens, Rockwell, Toshiba, Schneider Electric, LG, and Hanwha — a customer base built on decades of consistent, certified performance.
