Metal Clad Resistors
10W – 8.5kW
Power Range
Power Range
0.1Ω – 2MΩ
Resistance Range
Resistance Range
15+ Models
Series Available
Series Available
UL / CE
Certifications
Certifications
Certifications:
AEC-Q200
l
ISO9001
l
IATF16949
l
UL Listed
l
CE
l
TÜV Certified
What is a Metal Clad Resistor
A practical overview for engineers and procurement teams evaluating resistive solutions.
A metal clad resistor is a wire wound resistive element encased inside an aluminum or metal housing. The housing acts as both a heatsink and mechanical enclosure, allowing the resistor to dissipate heat efficiently when bolted to a chassis, heatsink plate, or enclosure wall.
This construction makes metal clad resistors ideal for applications that generate high levels of continuous or pulse power — situations where a conventional axial or through-hole resistor would overheat or fail. The aluminum body conducts heat away from the resistive element and into the mounting surface, extending component life and maintaining stable resistance values under load.
RARA's metal clad series covers everything from compact 10W single-element units to multi-element assemblies rated up to 8.5kW, with models available in horizontal, vertical, slim-profile, and flat-profile formats to suit a wide variety of enclosure and mounting requirements.
Construction
-Wire wound resistive element
-Aluminum or metal outer casing
-Chassis / surface mount design
-Single-element or multi-element assemblies
-Cement-encased variants available (RH10C)
-Wire wound resistive element
-Aluminum or metal outer casing
-Chassis / surface mount design
-Single-element or multi-element assemblies
-Cement-encased variants available (RH10C)
Key Advantages
-Excellent heat dissipation via chassis
-High power density in compact form
-Mechanically robust for vibration environments
-Broad resistance & tolerance range
-STEP files available for thermal analysis
-Excellent heat dissipation via chassis
-High power density in compact form
-Mechanically robust for vibration environments
-Broad resistance & tolerance range
-STEP files available for thermal analysis
RARA's metal clad resistors are our most produced product line — refined over decades of industrial and automotive deployment across six continents.
Applications
Where RARA metal clad resistors are deployed in the field.
EV Pre-Charge Circuits
Used to safely pre-charge DC bus capacitors in electric vehicles and hybrid drivetrains before the main contactor closes. RARA's ARH/ARV and IRBT series are AEC-Q200 qualified for automotive-grade reliability in pre-charge applications.
Used to safely pre-charge DC bus capacitors in electric vehicles and hybrid drivetrains before the main contactor closes. RARA's ARH/ARV and IRBT series are AEC-Q200 qualified for automotive-grade reliability in pre-charge applications.
Industrial Variable Speed Drives
Installed in AC and DC motor drives to limit inrush current, provide dynamic braking resistance, and protect power electronics. The IRH, IRM, and LFH series handle continuous braking loads from 60W to over 2kW in standard VFD enclosures.
Installed in AC and DC motor drives to limit inrush current, provide dynamic braking resistance, and protect power electronics. The IRH, IRM, and LFH series handle continuous braking loads from 60W to over 2kW in standard VFD enclosures.
Regenerative Braking & Dynamic Braking
High-power BRH/BRV, MCS, and MBVA series are engineered specifically for crane, elevator, conveyor, and servo braking systems — absorbing regenerated energy as heat during deceleration events up to 8.5kW.
High-power BRH/BRV, MCS, and MBVA series are engineered specifically for crane, elevator, conveyor, and servo braking systems — absorbing regenerated energy as heat during deceleration events up to 8.5kW.
Power Supplies & UPS Systems
Used as bleed resistors, discharge resistors, and load resistors in industrial power supplies, UPS units, and energy storage systems where controlled discharge of capacitor banks is required.
Used as bleed resistors, discharge resistors, and load resistors in industrial power supplies, UPS units, and energy storage systems where controlled discharge of capacitor banks is required.
Automation & Robotics
Motion control systems for industrial robots, CNC machines, and automated production lines rely on chassis-mount resistors to handle peak energy from servo amplifiers during rapid stop-start cycles.
Motion control systems for industrial robots, CNC machines, and automated production lines rely on chassis-mount resistors to handle peak energy from servo amplifiers during rapid stop-start cycles.
Marine & Rail Traction
Metal clad assemblies such as the RA and IRVA series are used in marine propulsion control panels and rail traction systems, where resistance to vibration, humidity, and salt exposure is critical.
Metal clad assemblies such as the RA and IRVA series are used in marine propulsion control panels and rail traction systems, where resistance to vibration, humidity, and salt exposure is critical.
Product Series
Select models from our metal clad lineup. Download individual datasheets for full specifications, dimensions, and ordering codes.
Model: RH10C
Resistor type: Metal clad resistor
Description: Metal clad cement encased
Power Rating: 10W
Resistance (Ω): 0.1~6k
Tolerance (%): ±0.5, ±1, ±2, ±5
TCR (ppm/C): 260 Max.
Model: RH, FRH
Resistor type: Metal clad resistor
Description: Aluminum housed, chassis mounted
Power Rating: 15W, 20W, 50W
Resistance (Ω): 0.1~2M
Tolerance (%): ±0.1, ±0.5, ±1, ±5, ±10
TCR (ppm/C): 40, 50, 100, 200
Model: URH
Resistor type: Metal clad resistor
Description: UL Aluminum housed, chassis mounted
Power Rating: 20W-100W
Resistance (Ω): 0.1~50k
Tolerance (%): ±1, ±2, ±5
TCR (ppm/C): 30, 50, 100, 200
Model: IRS
Resistor type: Metal clad resistor
Description: Slim profile, aluminum housed, chassis mounted
Power Rating: 30W, 50W
Resistance (Ω): 1~500
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRHC
Resistor type: Metal clad resistor
Description: Aluminum housed, chassis mounted
Power Rating: 40W, 60W, 100W
Resistance (Ω): 10~1k
Tolerance (%): ±5, ±10
TCR (ppm/C): 260 Max.
Model: ARN
Resistor type: AEC Q200 Automotive
Description: Flat profile
Power Rating: 50W-150W
Resistance (Ω): 1~1.75k
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRN, ULN, IRF, ULF
Resistor type: Metal clad resistor
Description: UL, Flat profile,aluminum housed, chassis mounted
Power Rating: 50W-500W
Resistance (Ω): 1~5.78k
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRBT
Resistor type: Metal clad resistor
Description: Automotive
Power Rating: 60W
Resistance (Ω): 1~1k
Tolerance (%): ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRB
Resistor type: Metal clad resistor
Description: Metal clad economy
Power Rating: 60W~120W
Resistance (Ω): 0.1~1.3k
Tolerance (%): ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: SFH/SFV
Resistor type: Metal clad resistor
Description: Industrial
Power Rating: 60W~200W
Resistance (Ω): 0.1~2.2k
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C):
Model: IRH, IRV, ULH, ULV
Resistor type: Metal clad resistor
Description: UL/CE, aluminum housed, chassis mounted
Power Rating: 60W~500W
Resistance (Ω): 0.1~6.8k
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: ARH, ARV
Resistor type: Metal clad resistor
Description: Automobile, pre-charge
Power Rating: 60W-500W
Resistance (Ω): 0.2~3k
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: RA
Resistor type: Metal clad resistor
Description: Assembly
Power Rating: 80W~750W
Resistance (Ω): 0.1~2.2k
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRVA
Resistor type: Metal clad resistor
Description: Chassis mounted assembly
Power Rating: 300W-450W
Resistance (Ω): 30~15k
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRP
Resistor type: Metal clad resistor
Description: Industrial
Power Rating: 300W~1.2kW
Resistance (Ω): 0.1~2k
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C):
Model: LFH
Resistor type: Horizontal metal clad
Description: Industrial
Power Rating: 300W-2kW
Resistance (Ω): 0.1~7k
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C):
Model: HRA
Resistor type: Metal clad resistor
Description: Assembly
Power Rating: 520W-2500W
Resistance (Ω): 0.1~1.6k
Tolerance (%): ±0.5, ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRV, ULV, IRM, ULM600-1200
Resistor type: Metal clad resistor
Description: UL/CE, aluminum housed, chassis mounted
Power Rating: 600W-1.2kW
Resistance (Ω): 0.1~175
Tolerance (%): ±1, ±2, ±5, ±10
TCR (ppm/C): 260 Max.
Model: LCA
Resistor type: Metal clad resistor
Description: Assembly
Power Rating: 1kW-4.2kW
Resistance (Ω): 0.6~864
Tolerance (%): ±5, ±10
TCR (ppm/C): 260 Max.
Model: MBH/MBV
Resistor type: Metal clad resistor
Description: Mini Assembly
Power Rating:1.1kW-2.9kW
Resistance (Ω): 0.4~240
Tolerance (%): ±5, ±10
TCR (ppm/C): 260 Max.
Model: BRH/BRV
Resistor type: High Power Braking
Description: Industrial
Power Rating:1.4kW-3.4kW
Resistance (Ω): 0.5~240
Tolerance (%): ±5, ±10
TCR (ppm/C): 260 Max.
Model: IRM, ULM
Resistor type: Metal clad resistor
Description: UL/CE, aluminum housed, chassis mounted
Power Rating: 1.6kW-2.8kW
Resistance (Ω): 0.3~144
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C): 260 Max.
Model: MCS
Resistor type: High Power Braking
Description: Industrial
Power Rating:2kW-3.4kW
Resistance (Ω): 0.1~9k
Tolerance (%): ±1, ±5, ±10
TCR (ppm/C):
Model: MBVA
Resistor type: Metal clad resistor
Description: Assembly
Power Rating: 3.3kW-8.5kW
Resistance (Ω): 0.5~100
Tolerance (%): ±5, ±10
TCR (ppm/C): 260 Max.
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.
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.
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.
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.
Global Track Record
Deployed by Siemens, Rockwell, Toshiba, Schneider Electric, LG, and Hanwha — a customer list built on decades of consistent performance.
Products & Downloads
Information & Schedule
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
© 2026 RARA Electronics LLC