Relay

A communication device comprising:

• a power distribution box;
• and
• an electric device;
• wherein the power distribution box is configured to switch a power status of the electric device;
• wherein the power distribution box comprises a driving board, the power distribution box is configured to dispose a relay comprising an electromagnetic mechanism, the electromagnetic mechanism comprises a yoke iron, a top cover, a static iron core, a primary permanent magnet group, and a secondary permanent magnet group, and the relay further comprises a first movable iron core and a second movable iron core;
• wherein the static iron core, the top cover, the primary permanent magnet group, and the secondary permanent magnet group are connected to the yoke iron via a fixed connection;
• wherein the top cover is provided with a first opening group, the first opening group is provided at a position at which the top cover is configured to be in contact with the first movable iron core, and the first opening group comprises at least one first sub-opening;
• wherein the yoke iron is provided with a second opening group, the second opening group is provided at a position at which the yoke iron is configured to be in contact with the second movable iron core, and the second opening group comprises at least one second sub-opening;
• and
• wherein the relay further comprises a coil former, a coil is disposed on the coil former, a cavity is provided inside the coil former, and the static iron core and the secondary permanent magnet group are disposed in the cavity;
• and
• wherein the driving board is configured to supply power to the coil.