For technical specifications, see https://support.industry.siemens.com/cs/ww/en/ps/16189/td

For FAQs, see https://support.industry.siemens.com/cs/ww/en/ps/16189/faq

For manuals, see https://support.industry.siemens.com/cs/ww/en/ps/16189/man

For the conversion tool, e.g. from 3RH11 to 3RH21, see http://www.siemens.com/sirius/conversion-tool