League One's most prolific marksmen made it 14 for the season as he grabbed a hat-trick to sink the sorry Spireites.
With Adebayo Akinfenwa and Owain Tudur-Jones also on the scoresheet, the Swans made sure of their standing as the Football League's best scorers to end their three-game run without a win in convincing fashion.
The 29-year-old Trundle was already in the headlines this week after securing a lucrative deal with the club as well as launching his own line of clothing.
But he allowed strike partner Akinfenwa to grab some of the limelight on seven minutes when his clever through ball allowed the former Torquay targetman to hammer home past hapless Barry Roche.
After going close with a lovely dipping shot, Trundle got in on the action himself when he stooped low to head home from a Tudur-Jones knockdown after Roberto Martinez's short corner.
Chesterfield could count themselves unlucky after suffering an unkind deflection to set up Trundle but defender Steve Blatherwick did give Roy McFarland's men some hope on 21 minutes when he shook off Izzy Iriekpen to head home a Shane Nicholson free-kick.
But Swansea's two-goal advantage was restored just seven minutes later when a surging run from Sam Ricketts ended with Trundle scoring from close range.
Willy Gueret had to save well from Kevan Hurst as half time approached but Swansea were back in their stride when Martinez, Leon Britton and Ricketts all combined to allow Tudur-Jones to get his second of the season.
And as Chesterfield shut up shop after the interval Swansea eventually made it five on 72 minutes as Trundle grabbed the match ball with a dazzling solo effort.