NSW forwards Trent Merrin, Beau Scott and James Tamou have all entered guilty pleas to charges arising from State of Origin III, with Merrin to serve a four-match ban.

Merrin's grade two dangerous throw charge on Cameron Smith - plus 68 carryover points - means he'll miss four matches and could have risked a five-match ban had he challenged the charge at the judiciary and lost.

Meanwhile Scott and Tamou will both serve one-match bans after pleading guilty to a grade one dangerous throw charge and a grade two careless high tackle respectively.