IRP 300 to 1200W Series Metal Clad Resistors
Aluminium housed, chassis mount 300W–1200W power rating (on heatsink)
Motor drives, braking & snubber applications
EV charging & industrial power sources
Inductive & non-inductive winding options
100% RoHS compliant
What are the IRP 300 to 1200W Series Metal Clad Resistors?
The IRP 300~1200 is a high-power wire wound metal clad resistor series engineered for industrial motor control, power electronics, and electric vehicle charging applications where power dissipation requirements exceed what standard single-element resistors can deliver. Available in six models from IRP300 through to IRP1200, the series spans heatsink-rated power from 300W to 1200W — making it one of the highest-power single-body metal clad resistor families in the RMS range.
Each model is housed in a large extruded aluminium body that provides strong mechanical protection and serves as an integrated heatsink when bolted firmly to a chassis or heatsink surface. The generous contact area of the aluminium base enables effective thermal transfer even under sustained full-power loading, making the IRP series well suited to continuous duty motor braking, load bank, and discharge resistor applications where the resistor must handle repetitive or prolonged high-energy cycles reliably over its service life.
Both inductive and non-inductive winding configurations are offered across the entire range. The non-inductive option is important for snubber networks and high-frequency switching applications where residual winding inductance would degrade transient suppression performance. The resistance range spans 0.1Ω to 2.0kΩ for inductive models and 0.1Ω to 1.0kΩ for non-inductive models, with tolerance options of ±1%, ±5%, and ±10% covering the majority of industrial power and current-limiting specifications.
Dielectric withstand voltage is rated at AC 2500V (1 minute, maximum 5mA leakage current), and insulation resistance is 100MΩ at 500Vdc — suitable for medium-voltage industrial bus architectures. Heat resistance testing at 180°C for 2 hours, combined with a TCR of ±260 ppm/°C maximum, confirms stable and predictable electrical performance across the demanding thermal environments encountered in motor control enclosures and power electronics installations.
IRP 300 to 1200W Series Metal Clad Resistors Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
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):
Applications of the IRP 300 to 1200W Series Metal Clad Resistors
Where RARA metal clad resistors are deployed in the field.
-Motor drives — high-power continuous duty braking and load resistors in variable frequency drive (VFD) systems
-Regenerative braking systems — sustained energy dissipation during high-power motor deceleration cycles
-Snubber networks — transient voltage suppression across IGBT and MOSFET switching devices in medium-voltage converters (non-inductive option)
-Electric vehicle (EV) charging infrastructure — high-power inrush limiting and load resistor applications in DC fast charging stations
-DC bus discharge resistors — controlled high-power bleed-down of large DC link capacitor banks at system shutdown
-Industrial power sources — soft-start and inrush control for heavy industrial machinery and large motor starters
-Energy storage system (ESS) discharge control — resistive discharge networks in large-format battery and supercapacitor banks
-Load banks and test equipment — high-power resistive dummy loads in power electronics development, commissioning, and type testing
-Wind and solar inverters — load dump and braking resistors in renewable energy generation and grid-tie converter systems
Related Products of the IRP 300 to 1200W Series Metal Clad Resistors
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: 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: 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: 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):
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.
