The relay base is intended for use in an intelligent system. Form C latching relay contacts are included for the control of an auxiliary function. The relay can operate in two different modes (short and long delay). The activation time when the short delay is used is 60 msec to 100 msec, while the activation time for the long delay is 6 sec to 10 sec. A shunt with pin headers, located on the base PC board, can be used to choose your desired delay. B224RB-WH is set at the short delay when manufactured.