Jesper Bratt scored twice, and Cody Glass had a goal for the Devils (20-16-2), who have lost three straight (0-2-1). Allen made 29 saves.
“We played a good game,” New Jersey coach Sheldon Keefe said. “Found ways to a couple in the third period that obviously put us in a position to win. One on the power play, two at even strength, that should be enough to win you games. We gave them too many tonight.”
Dylan Strome appeared to give the Capitals a 1-0 lead at 11:58 of the first period when he scored on a rebound, but the Devils challenged the zone entry and after a video review the play was ruled offside.
Protas put Washington up 1-0 with less than a second left in the first period. Ovechkin controlled a loose puck along the left wall and centered to Protas, who redirected the puck over Allen.
“You’ve got to be engaged in the play,” Bratt said. “You’ve got to know the time that’s left on the clock. Finish plays. It’s a lot different going into the second [period] in a tie game when we’re playing like that.”
Protas has seven points (four goals, three assists) in his past five games.
“I thought he was fantastic,” Carbery said of Protas. “Noticeable in all three zones. Even his breakout wall play was so strong. Good decisions with the puck. I’m moving him around different lines, he’s playing with different centermen. Has three points tonight. Terrific night for him.”
Bratt tied it 1-1 with a power-play goal at 4:56 of the second period. Nico Hischier got to a rebound in the slot and quickly passed to Bratt, who scored with a snap shot from the bottom of the right circle.