What is output 4 used for on the Sepam 20?
Sepam 20 Series
Sepam 40 Series
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.