Chip,

This is a diagram of a circuit I used to hold back a solenoid for 20 seconds using a self latching idea with an on delay timer to open the feed to both coils. The MY 4 pole relay was there to handle load from the solenoid and to provide the latch (closed circuit) to keep the timer powered and the MY4 relay latched in. After the time limit, the timer would open the contacts and break the circuit.

Using the relay in the link below, you wouldn't need the additional MY4 relay as the timer itself has 4 sets of contacts inside it (but only rated at 5 amp) so it could provide it's own self latch and then you could use one of the other sets of contact to power what ever you need.

http://uk.rs-online.com/web/p/time-d...elays/2361329/