Device and circuit for protecting controlled loads, and apparatus for switching between loads

A device for protecting controlled loads, comprising:

• a plurality of load switches, comprising at least a first load switch and a second load switch, wherein the first load switch is in series connection with a first controlled load to form a first controlled load branch, the second load switch is in series connection with a second controlled load to form a second controlled load branch, the first controlled load branch is in parallel connection with the second controlled load branch, and each of the first load switch and the second load switch comprises a switch control terminal, and is turned on when a potential/current of a corresponding switch control terminal is in a first voltage/current interval and turned off when the potential/current of the corresponding switch control terminal is in a second voltage/current interval;
• and
• a signal control module, comprising a signal control element, wherein one end of the signal control element is switched between the switch control terminal of the first load switch and the switch control terminal of the second load switch for connection, and the end of the signal control element enables, when being connected to the switch control terminal of any of the first load switch and the second load switch, the potential/current of the corresponding switch control terminal to be in the second voltage/current interval and enables, when being disconnected from the switch control terminal of any of the first load switch and the second load switch, the potential/current of the corresponding switch control terminal to be in the first voltage/current interval.