Roller shutter controller STR-421 two-button, Un = 24V AC, 8A, 1 module STR-421-24V

The STR controller is designed to control roller shutters (up-down) or other objects (e.g. gates) driven by a single-phase AC electric motor with momentary switches (e.g. bells). The controller can work as a standalone device (intended for opening / closing one roller shutter), as well as it is possible to combine the controllers into groups enabling central control of many roller shutters.
Action
The power supply of the controller is indicated by the green LED U. The roller shutter motor is turned on by momentarily applying voltage (L or N) to one of the control inputs. The motor is switched on for a time pre-programmed by the user, which allows the roller shutter to be fully raised or lowered. The operation of the motor and the direction of the roller shutter movement are