A new series of stainless steel braking/crowbar resistors have been announced by Vishay. Featuring industry-high pulse energy capability up to 3.46 MJ and pulse current capability up to 12 kA, the Vishay Draloric resistors can be optimized for frequency converters for three-phase generators in wind power plants and pumped-storage hydro power stations.
The Vishay Draloric can also serve as brake and chopper resistors for railways, elevators, and industrial systems. The ULDCR resistors feature a patented self-supported, extremely robust, and compact modular design that is easily assembled into all of these applications. The resistors' component materials are also resistant to salt water. Higher pulse load capacity versions built to customer specifications are also available.
The devices feature a typical temperature rise below 350 °C for a single pulse. Offering high operating temperatures up to 375 °C, the ULDCR series provides resistance values from 1 mΩ to several ohms, with available tolerances of ± 5 % and ± 10 % and a maximum expected change of resistance in service of less than ± 20 %.
The Vishay Draloric is manufactured without any organic compounds, and the devices are RoHS-compliant and conform to Vishay "Green" standards.
Samples and production quantities of the ULDCR resistors are available now, with lead times to 14 weeks for larger orders at competitive prices.