17 May 2019
powerMELA Insulation Guard
17 May 2019
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powerMELA Brake Chopper

System safety

The powerMELA brake chopper is an electric permanent brake equipped with oil cooling which protects against overvoltages. Its housing fulfills the requirements for the IP6K9K.


The powerMELA brake chopper is a component for the monitoring of the intermediate circuit voltage in the electrical system. Like all powerMELA components, the brake chopper is also characterized through its field-tested robustness. It has been especially developed for electronic braking in mobile machines.


The brake choppers measure the intermediate circuit voltage and connect automatically when they detect the exceedance of a set threshold valve (e.g. when the vehicle is braked). High power resistors are also connected which transform the excess electrical energy into thermal energy. The generated heat is dissipated by the integrated oil cooling. The brake chopper thus protects against overvoltage in a manner comparable to an overpressure valve in pressure systems. After the vehicle is switched off, the brake chopper immediately reduces the HV voltage in the intermediate circuit and prevents risks during subsequent maintenance or repair work.

Braking power

Due to its liquid cooling, the powerMELA brake chopper can provide a continuous brake power of 50 kW. Higher braking performances can also be achieved short-term.

Control unit

The parameterization for the adjustment of the brake characteristics and switching thresholds takes place via CAN.


The braking power of the powerMELA brake chopper can be tailored to the requirements of a specific customer application and united with other STW components (inverter, insulation monitor, power distribution unit etc.) in a single housing as a modular power system box.


The comprehensive software toolchain for the powerMELA brake chopper supports you regarding the system integration.

powerMELA Brake Chopper is a product of
Sensor-Technik Wiedemann GmbH
All rights are reserved.


Operation Data
Size (resistor)3 x 2R2 Ω
Rated voltage DC (passive range)up to 695 V
Operating voltage range DC (active range)up to 800 V
Rated capacity50 kW
Maximum power500 kW
Earthing SystemIT
Maximum impulse withstand voltage4000 V
Insulation monitoringoptional
Control typeBrakes, overvoltage protection, intermediate circuit discharge
Temperature range-40 °C ...+85 °C
-40 °F ... +185 °F
LV Power supply DC9 ... 32 V
Mechanical Data
Protection classIP6K9KCommunication Connector IP67
Maximum coolant temperature60 °C / 140 °FTransformer oil 50 l/m
Cooling line connection2 x M26 x 1,5
Connection DC line2 x 70 mm2with 8 mm cable lug
Connection Communication19 pins, 2 x CAN; I/O
Control connection2 x CAN
Maximum operating height5000 m.a.s.l.
Weight53 kg
Dimensions L x W x H (L x W x H)507 x363 x 324 mm (19.96 x 14.29 x 12.76 inch)

Code: 1142501000100 BRAKE-CHOPPER POWERMELA 500KW

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