O4 does not need to be wired for the SEPAM 20 and 40 series to provide proper protection. O4 is used as a watchdog only. O4 acts as a malfunction detection output such that if a fault occurs in the relay it will be detected. The relay will then open the circuit breaker and enter fault mode.
Legacy KB System (APS) Data: RESL205509 V1.0, Originally authored by MiZe on 06/09/2011, Last Edited by MiZe on 06/09/2011
Related ranges: Sepam series 20, Sepam series 40