3RP15251AP30 ON Delay Single Timer Relay, Screw, 0.5 s 360000 s, SPDT. The Siemens 3RP15 single timer relay is a compact equipment with high precision. It performs the function of providing ON delay in the range of 0.5 seconds to 100 hours. This timer relay is enabled with a comprehensive range of timing to suit a wide variety of applications. It satisfies all requirements like reliability, shock resistance, as well as, standards governing interference immunity and suppression. Its affordability, optimum space management, and high performance make it ideal for a wide range of applications in process control environments.