Siemens 3RQ1000-1GW00 Positively driven coupling relay in industrial enclosure 2 NO contacts / 1 NC contact 24 V to. Siemens 3RQ1000-1GW00 is the exact printed commercial reference for a coupling relay in the SIRIUS 3RQ range. Siemens' official product description is: Positively driven coupling relay in industrial enclosure 2 NO contacts / 1 NC contact 24 V to 240 V AC/DC SIL 2 / PL c Screw terminals.