The cut-off lifting limit is a protective type, mainly composed of dynamic and static contacts, push rods (action rods), bases, covers, and shells. When the lifting hook rises or descends to a certain limit position, it will push or pull the push rods on the cut-off limit device, causing one pair of dynamic and static contacts to disconnect and cut off the power supply, thus playing a limiting role. When the push rods and action rods are reset, the contacts will be closed again under the action of spring force.