BRVA432K Braking High Power Resistor Assembly
Triple-element metal-clad wire-wound assembly (BRV14400 × 3)
Maximum pulse power: 138 kW (45-second duty)
Tolerance: ±5% (J) or ±10% (K)
Motor drives, braking, snubber, dump load, and hydrogen fuel cell applications
Optional thermostat for over-temperature protection
100% RoHS compliant
What is the BRVA432K Braking High Power Resistor Assembly?
The BRVA432K is a high-power metal-clad wire-wound resistor assembly engineered for industrial drive systems, renewable energy installations, and hydrogen fuel cell applications requiring robust, repeatable energy dissipation under demanding pulse conditions. The assembly combines three BRV14400 resistor elements into a single integrated unit, delivering a maximum pulse power of 138 kW at a 45-second duty cycle — referenced to one single square pulse every 1,800 seconds — with a resistance range of 2.0 Ω to 240 Ω covering the impedance requirements of industrial braking chopper circuits, dump loads, and fuel cell power conditioning systems.
Tolerance options of ±5% (J) and ±10% (K) are available as standard, with a temperature coefficient not exceeding ±260 ppm/°C. The assembly's maximum surface temperature rating of 350°C and a working voltage of 600 VAC confirm suitability for industrial drive bus voltages. Dielectric strength is tested at DC 2000 V for 1 minute (maximum leakage current 10 mA), and insulation resistance is guaranteed at 20 MΩ minimum. The short-time overload rating of 10× rated power for 5 seconds accommodates the intense repetitive pulse loads characteristic of braking duty cycles and hydrogen fuel cell load-transient events. An optional thermostat enables over-temperature signalling for enclosed cabinet and containerised installations.
Braking, dump load & hydrogen fuel cell application note: In variable-speed drive systems, the BRVA432K is connected across the DC bus through a braking chopper IGBT. During motor deceleration or emergency stop events, regenerative energy raises bus voltage above the regulation threshold, triggering the chopper to switch the BRVA432K into circuit. In wind turbine and solar inverter applications the assembly functions as a dump load resistor, dissipating excess generated power during grid fault or overspeed events. In hydrogen fuel cell systems, the BRVA432K is deployed as a controlled load-dump resistor across the fuel cell DC output bus: during rapid load-off or emergency disconnection events, the resistor absorbs the fuel cell's residual energy output, clamping bus voltage within safe limits, protecting downstream power electronics, and preventing fuel cell membrane damage caused by sudden pressure and current transients.
BRVA432K Braking High Power Resistor Assembly Specifications
A practical overview for engineers and procurement teams evaluating resistive solutions.
Model: BRVA432K
Internal Elements: BRV14400 × 3
Max Pulse Power [kW] *Duty 45 sec: 138kW
Max. Surface Temperature: +350 °C
Resistance (Ω): 2~240
Tolerance (%): ±5, ±10
TCR (ppm/C): 260 Max.
Applications of the BRVA432K Braking High Power Resistor Assembly
Where RARA metal clad resistors are deployed in the field.
Hydrogen Fuel Cell Systems
-Fuel cell DC bus load-dump resistors — protection from rapid load-off and emergency disconnection events
-Residual energy absorption during fuel cell shutdown and stack depressurisation sequences
-Overvoltage clamping in proton exchange membrane (PEM) and solid oxide fuel cell (SOFC) power conditioning systems
Motor Drive & Industrial Braking
-Motor drive braking chopper circuits — DC bus overvoltage clamping during deceleration
-High-power variable-speed drive (VSD) regenerative energy absorption
-Emergency stop (e-stop) braking in heavy industrial machinery
Renewable Energy & Power Systems
-Wind turbine dump load and crowbar resistor assemblies — grid fault energy dissipation
-Solar inverter DC bus protection during grid fault and anti-islanding events
-Snubber and overvoltage protection in high-power converter systems
Related Products of the BRVA432K Braking High Power Resistor Assembly
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: 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: 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: 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.
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.
