this electric actuator for driving a home - automation screen is provided with a spring brake comprising a helical spring , a friction part having a friction surface against which the helical spring bears radially . said brake further comprises an inlet part suitable for driving the spring in rotation in a direction reducing the contact force between the spring and the friction part , and an outlet part connected to the screen . while the screen is being lowered , the inlet part drives the spring in rotation with the contact force being decreased to the extent that the outlet part is released in rotation , without direct contact between the inlet part and the outlet part . the inlet part has at least two contact surfaces suitable for transmitting drive torque for raising the screen , by direct contact , to at least two corresponding contact surfaces of the outlet part .