We call them ALPHA
Danotherm Electric manufactures a wide range of industrial power resistors. These resistors come in varying constructions for suitability to diverse applications.
Danotherm manufactures axial resistors, ceramic wirewound resistors, steel grid resistors, steel tube resistors, and aluminum house resistors.
Aluminum is a metal with characteristics that make it an ideal choice for high-power resistors. The Aluminum housing is anodized, making it non-corrosive, lightweight yet durable, and is an excellent conductor of heat. The choice of aluminum for resistor housings leads to high IP ratings and good vibration withstand capability.
The surface of the housings CCR, CAR, CBR, and CBT, is extruded and deep finned for improved heat conduction. The resistors cool via natural convection. Using forced air cooling can improve cooling and/or operation at higher power ratings.
Danotherm aluminum housed resistors use UL-approved components for high reliability. Nominal power ratings range from 42 - 4350 W. The working voltage ranges are 600 VAC / 850 VDC – 3000VAC / 4200 VDC. The protection ratings for aluminum housed resistors range from IP00 to IP65.
Danotherm aluminum housed resistors, marketed under the brand name ALPHA, are widely used for filter, charging/discharging, brake, and high energy dump applications.