The Model 339 ON/OFF Delay Relay is an electronic time delay relay which provides two functions: ON delay and true OFF delay. The ON delay begins when the appropriate power is applied. The relay contacts will transfer to the energized state upon completion of the ON delay period. If power is removed and re-applied before the delay period is completed, the delay period will be reset to zero, requiring the full time period to be completed before the OFF time can be started.

Timing of the true OFF delay period commences when power is removed. The Model 339 is unique, as it requires no power to be applied during the timing of its OFF cycle. This feature allows the Model 339 to find application in many cases where
delayed action is required when no power is available.

Each time delay, ON and OFF, is separately adjustable. The Model 339 uses the same pin-out configuration as standard time delay and general purpose relays. It can be used in new or replacement applications for thermal, pneumatic, or spring-wound timers, or in place of general purpose relays or other electronic timers.
 

Dimensions	Pin Connection