General Javier Iturriaga del Campo was informed that his troops would be concentrated on surveillance operations in the city's most conflictive areas.
As a result, people can move to their homes during daylight hours because the curfew has not been declared so far.
"The recommendation for people is that they can go to their homes with their families," he said and added that "we are taking over."
Over the last 11 days, the Santiago subway has been the scene of manifestations of discontent, for students called to evade the payment of tickets.
No soy de Chile pero estoy viviendo en Santiago, este país nos ha acogido a mi familia y a mi, y esta situación me tiene triste, como es posible que hagan este tipo de agresiones, es solo un estudiante y posiblemente menor de edad#EstadoEmergencia pic.twitter.com/RaKNCkflUU
"I am not Chilean but I am living in Santiago. This country has welcomed my family and me. All this situation makes me sad. This sort of aggression should not happen. He is just a student and possibly a minor. State of Emergency."
Friday's protests acquired new nuances as citizens raised barricades in the streets and confronted the Chilean militarized police. As a result, hundreds of people were arrested and injured.
The last time Chile experienced a state of emergency was in 2010, when the population carried out some looting after the earthquake.
The Communist Party lawmaker Boris Barrera said that the state of emergency is a resounding failure because it shows that the Piñeira administration has no political answers to popular demands and has to resort to instruments used by the dictatorship.
Likewise, in response to the official announcement to invoke the State Security Law, the Socialist Party regretted that President Piñeira's response is more repression.
"Nothing justifies excesses. With its attitude, however, the executive deepens the feeling of abuse and repeats a formula which already failed during his first presidential term," the PS said.
"We condemn that authorities have not responded by promoting dialogue. The citizen's fatigue is motivated by a continuous increase in basic services prices, which has sharply affected the Chilean families' life quality ."