Cement Resistors
2W – 60W
Power Range
Power Range
AEC-Q200
Available
Available
0.04Ω – 100kΩ
Resistance Range
Resistance Range
Durability
Technologies
Technologies
Technologies:
AEC-Q200 Model
l
High Temp Rated
l
Moisture Resistant
What Is a Cement Resistor?
A practical overview for engineers and procurement teams evaluating resistive solutions.
A cement resistor — also called a ceramic encased resistor — is constructed by winding a resistive wire element around a core, then encasing the entire assembly in a ceramic cement housing. The cement casing is fired at high temperature, producing a rigid, non-flammable enclosure that provides three key protective properties: excellent heat resistance, moisture resistance, and vibration resistance.
Compared to standard axial resistors, cement types can sustain significantly higher operating temperatures without derating — making them ideal for installation in enclosures, engine compartments, and industrial control panels where ambient temperatures are elevated. The sealed ceramic housing also prevents ingress of moisture and contaminants that could degrade resistance stability over time.
RARA's cement resistor range spans seven series — RQA, RQR, RQB, RQL in standard configurations, RQR15–50 for higher power ratings up to 50W, and the AQL series which is AEC-Q200 qualified for direct use in automotive applications. The RQO power film variant serves specialized capacitor discharge applications within the same enclosure family.
Construction Technologies
-Wire wound resistive element
-Ceramic cement outer casing
-Fired at high temperature — rigid & non-flammable
-Sealed housing — moisture and contamination resistant
-AEC-Q200 qualified variant (AQL)
-Wire wound resistive element
-Ceramic cement outer casing
-Fired at high temperature — rigid & non-flammable
-Sealed housing — moisture and contamination resistant
-AEC-Q200 qualified variant (AQL)
Key Advantages
-Superior heat resistance vs standard axial types
-Excellent moisture and humidity resistance
-Robust against shock and vibration
-Non-flammable ceramic enclosure
-Automotive-qualified model available
-Superior heat resistance vs standard axial types
-Excellent moisture and humidity resistance
-Robust against shock and vibration
-Non-flammable ceramic enclosure
-Automotive-qualified model available
RARA cement resistors are durable and able to withstand higher temperatures — with excellent heat, moisture, and vibration resistance that makes them the go-to choice when standard resistors cannot survive the environment.
Applications
Where RARA cement resistors are deployed in the field.
Automotive Electronics
The AQL series is AEC-Q200 qualified for direct use in automotive circuits — including HVAC blower motor control, seat heating circuits, lighting ballasts, and battery management systems where resistors must survive automotive temperature cycling, vibration, and humidity over a vehicle's full service life.
The AQL series is AEC-Q200 qualified for direct use in automotive circuits — including HVAC blower motor control, seat heating circuits, lighting ballasts, and battery management systems where resistors must survive automotive temperature cycling, vibration, and humidity over a vehicle's full service life.
Industrial Control Panels
Cement resistors are a staple of industrial control panel design — used as discharge resistors, current limiters, and voltage dividers in VFD panels, motor starters, and PLC enclosures where elevated ambient temperatures make standard axial resistors unsuitable without derating.
Cement resistors are a staple of industrial control panel design — used as discharge resistors, current limiters, and voltage dividers in VFD panels, motor starters, and PLC enclosures where elevated ambient temperatures make standard axial resistors unsuitable without derating.
High-Humidity & Outdoor Equipment
The sealed ceramic cement housing resists moisture ingress, making cement resistors well-suited to outdoor switchgear, marine electronics, agricultural equipment, and any application where condensation or water splash could degrade an unsealed resistor's performance over time.
The sealed ceramic cement housing resists moisture ingress, making cement resistors well-suited to outdoor switchgear, marine electronics, agricultural equipment, and any application where condensation or water splash could degrade an unsealed resistor's performance over time.
High-Temperature Environments
Engine compartment electronics, industrial ovens, and heating system controls require resistors that can operate continuously at elevated temperatures. The fired ceramic casing of cement resistors gives them superior thermal endurance compared to epoxy-coated or film types in these conditions.
Engine compartment electronics, industrial ovens, and heating system controls require resistors that can operate continuously at elevated temperatures. The fired ceramic casing of cement resistors gives them superior thermal endurance compared to epoxy-coated or film types in these conditions.
Capacitor Discharge Circuits
The RQO power film cement-encased variant (10W, 0.5Ω–75kΩ) is specifically designed for high-power capacitor discharge applications — where pulse energy handling and robust enclosure are both required in a compact, board-mountable form factor.
The RQO power film cement-encased variant (10W, 0.5Ω–75kΩ) is specifically designed for high-power capacitor discharge applications — where pulse energy handling and robust enclosure are both required in a compact, board-mountable form factor.
Vibration-Heavy Applications
Construction equipment, heavy vehicles, rail systems, and industrial machinery subject components to constant vibration that can fatigue wire bonds and crack epoxy encapsulants. The rigid cement casing mechanically protects the wire wound element, maintaining long-term reliability under vibration stress.
Construction equipment, heavy vehicles, rail systems, and industrial machinery subject components to constant vibration that can fatigue wire bonds and crack epoxy encapsulants. The rigid cement casing mechanically protects the wire wound element, maintaining long-term reliability under vibration stress.
Product Series
Select models from our cement lineup. Download individual datasheets for full specifications, dimensions, and ordering codes.
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: 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.
Model: RQR15~50
Resistor type: Wire wound
Description: Ceramic encased
Power Rating: 15W~50W
Resistance (Ω): 0.04~54k
Tolerance (%): ±0.5~±10
TCR (ppm/C): 260, 400
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
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
Model: AQL
Resistor type: Wire wound
Description: AEC-Q200, ceramic encased
Power Rating: 20W~60W
Resistance (Ω): 20~80
Tolerance (%): ±5
TCR (ppm/C): 260 max.
Why Choose RARA Cement Resistors
What sets RARA apart for engineers and procurement managers in industrial and automotive markets.
01
Harsh Environment Ready
The fired ceramic cement casing provides simultaneous protection against heat, moisture, and vibration — three failure modes that eliminate standard resistors from consideration in tough environments.
Harsh Environment Ready
The fired ceramic cement casing provides simultaneous protection against heat, moisture, and vibration — three failure modes that eliminate standard resistors from consideration in tough environments.
02
Automotive Qualified
The AQL series is AEC-Q200 qualified and IATF 16949 certified — ready for direct specification into automotive designs without additional qualification testing.
Automotive Qualified
The AQL series is AEC-Q200 qualified and IATF 16949 certified — ready for direct specification into automotive designs without additional qualification testing.
03
Full Power Range
From 2W compact types to 60W AEC-Q200 automotive units — seven series covering the full cement resistor power spectrum from a single ISO 9001 certified supplier.
Full Power Range
From 2W compact types to 60W AEC-Q200 automotive units — seven series covering the full cement resistor power spectrum from a single ISO 9001 certified supplier.
04
Global Track Record
Trusted by GM Korea, Siemens, Rockwell, Schneider Electric, and Hanwha — deployed in automotive, industrial, and marine applications across six continents.
Global Track Record
Trusted by GM Korea, Siemens, Rockwell, Schneider Electric, and Hanwha — deployed in automotive, industrial, and marine applications across six continents.
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100B-11L, 138 Cheongneung-
daero 410beon-gil,
Namdong-gu, Incheon
TEL : +82-70-4355-4327
FAX : +82-32-817-4328
Email: osm1@raraohm.com
daero 410beon-gil,
Namdong-gu, Incheon
TEL : +82-70-4355-4327
FAX : +82-32-817-4328
Email: osm1@raraohm.com
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