Other Considerations when selecting a Power Resistor.
- Temperature range of Automated Equipment
- Location of Power Resistor affecting other subcomponents
- Metal thickness and Surface Contact.
- Dont Place Power Resistor where it may be touched my operators
- Dont Place Power Resistors on area which my damage surface exposed to high temperature.
- Consider Cooling options
- Will Inductance affect your design.
- Packaging of Power Resistor
Manufacturer of Power Resistors: http://www.vishay.com/docs/30201/30201.pdf
Information about Resistor Selection http://www.ohmite.com/catalog/pdf/appnotes_res_select.pdf
For distributor check Newark Digikey links in lists.