Limit switches at the end of the deadbolt throw. Or reversible solonoid. Or solonoid that can be switched off. Osram. Sprecker and schue. Telemechanique. Pefhel and Fuchs.
Limit switches at the end of the deadbolt throw. Or reversible solonoid. Or solonoid that can be switched off. Osram. Sprecker and schue. Telemechanique. Pefhel and Fuchs.