The incident occurred in the third quarter on a third-and-8 play from the San Francisco 14-yard line. Quarterback Alex Smith completed an 11-yard pass to wide receiver Antonio Bryant and, as the play was whistled dead, Wragge shoved Herndon, drawing a flag for a personal foul.
Since the flag technically occurred after the play, the 49ers were awarded a first down, then penalized half the distance to the goal line, or 12 yards. On the ensuing play, Smith connected with wide receiver Arnaz Battle for a 54-yard gain, and the possession ended with an eight-yard touchdown pass to tight end Vernon Davis that nudged the 49ers into a 10-7 lead.
The 49ers won the game 24-14, their second victory over the Seahawks this season.
It is not known if Wragge will appeal the fine.
Wragge, 26, had replaced starting center Eric Heitmann, who suffered a season-ending broken leg early in the contest. It's expected that Wragge, a journeyman blocker who has played in three different league and been waived five times, will start the final two games of the season.
Len Pasquarelli is a senior NFL writer for ESPN.com. To check out Len's chat archive, click here.