I am seeking a simple but reliable solid state equivalent for the simple start/stop sealed relay contacts scheme that we all know and love.
A mains power scheme that will switch on with an "ON" button and stay on except if the power fails, at which time it must switch off and not switch back on until the "ON" button is pressed again. The load in this case will be less than 5 amps, but needs to stay energized for years, unless the power fails. Then it must not switch back on until the button is pressed. The load can live with a few volts drop across the control system.
A mains power scheme that will switch on with an "ON" button and stay on except if the power fails, at which time it must switch off and not switch back on until the "ON" button is pressed again. The load in this case will be less than 5 amps, but needs to stay energized for years, unless the power fails. Then it must not switch back on until the button is pressed. The load can live with a few volts drop across the control system.