The utility model discloses a join in marriage power -grid switch analog switch unit for equipment, including terminal box and voltage self -adaptation conversion and isolation module, analog switch control module, high accuracy time delay module and the electronic relay analog switch of setting in the terminal box, conversion of voltage self -adaptation and isolation module are used for for analog switch control module and the power supply of high accuracy time delay module, analog switch control module connects high accuracy time delay module and electronic relay analog switch. The utility model discloses adopting the simulation tests mode in joining in marriage the net line test, adopting interface self -adaptation intelligence analog switch unit to replace actual switchgear among the test procedure, take the simulation tests mode to have a power failure, the circuit operation is not influenced. The at utmost reduces the influence to the user.