They typically incorporate a permanent magnet system that can be controlled through a switch to turn the magnetic force on and off. The main feature of such lifters is the ability to change the magnetic state by operating a switch, allowing for lifting and releasing of objects.

The principle of switchable permanent magnetic lifters is based on the characteristics of permanent magnets. When the magnet is in the open state, it generates a certain magnetic force, enabling it to attract metal objects. When the magnetic force is no longer needed, switching the magnet system to the closed state reduces or eliminates the magnetic force, allowing the object to be freely released.

Lifters can be classified based on the magnetic principles they use. In addition to switchable permanent magnetic lifters, other common types include:

1. Electromagnetic lifters: They use electric current passing through a coil to generate a magnetic field, allowing them to attract metal objects. The magnetic force can often be adjusted by controlling the current.

2. Permanent magnetic lifters:Unlike switchable lifters, the magnetic force of permanent magnetic lifters is fixed and cannot be adjusted through a switch. These lifters are typically used for smaller objects, where constant adjustment of magnetic force is not necessary.