Siemens sirius time delay relay timer 3rp1 series siemens 3rp1505 1bw30 the siemens 3rp1505 1bw30 is a din rail timing relay from the sirius 3rp1 series it is perfectly suited for all delayed switching processes in control starting protection and regulation circuitsthe solid state timing relay is supplied with 1 changeover contact and a voltage rating of 24 240v acdc siemens 3rp1505 1bw30 time delay relay timer 2 changeover 24 240 v dcac