Relay

1. A relay comprising:

a magnet armature comprising a magnetic core;

a permanent magnet secured to the magnet armature for identifying a position of the magnet armature, wherein the permanent magnet is a ring magnet with an opening;

a magnetic sensor configured to detect a magnetic field of the permanent magnet;

a hermetically sealed housing, wherein the magnet armature and the permanent magnet are arranged inside the housing, wherein the magnetic sensor is arranged outside of the housing, wherein the magnetic sensor is fixedly connected to the housing, and wherein the housing is configured to be filled with a gas; and

an exhaust tube extending at least intermittently into the opening in a first position of the permanent magnet.

2. The relay according to claim 1 , wherein the magnetic sensor comprises a switch.

3. The relay according to claim 2 , wherein the switch comprises a reed switch.

4. The relay according to claim 2 , further comprising a plurality of contacts, wherein the switch is closed when the contacts are open.

5. The relay according to claim 2 , further comprising a plurality of contacts, wherein the switch is open when the contacts are closed.

6. The relay according to claim 1 , wherein the magnetic sensor comprises a changeover switch.

7. The relay according to claim 1 , wherein the permanent magnet is secured to the magnetic core.

8. The relay according to claim 1 , wherein the permanent magnet is arranged at a first axial end of the magnet armature.

9. The relay according to claim 8 , further comprising a movable contact, which forms a second axial end of the magnet armature, wherein the second axial end is opposite the first axial end.

10. The relay according to claim 1 , wherein the magnet armature has a recess, and wherein the permanent magnet is arranged at least partly in the recess.

11. The relay according to claim 1 , wherein the permanent magnet is formed symmetrically with respect to a longitudinal axis of the relay.

12. The relay according to claim 1 , wherein the permanent magnet is formed as a disk magnet.

13. The relay according to claim 1 , wherein the exhaust tube comprises an exhaust pump, and wherein the exhaust pump is configured to evacuate the gas from the housing.

14. The relay according to claim 1 , wherein the gas is a protective gas.

15. The relay according to claim 1 , wherein the relay is an electromagnetically active switch.

16. A relay comprising:

a hermetically sealed housing configured to be filled with a gas;

contacts located at a first side of the housing;

a magnet armature comprising a magnetic core and a permanent ring magnet with an opening secured to the magnet armature for identifying a position of the magnet armature, the magnet armature located at a second side of the housing;

a movable contact arranged at a second axial end of the magnet armature opposite to a first axial end where the permanent magnet is arranged, the movable contact configured to contact the contacts in an active state and galvanically isolate from the contacts in a rest state, wherein the housing surrounds the magnet armature and the contacts completely;

a magnetic sensor configured to detect a magnetic field of the permanent magnet, wherein the magnetic sensor is fixedly arranged outside the housing; and

an exhaust tube extending at least intermittently into the opening in a first position of the permanent magnet, the exhaust tube connectable to a chamber configured to be filled with the gas inside the housing where the contacts and the movable contact are located.

17. The relay according to claim 16 , wherein the relay is an electromagnetically active switch.

18. The relay according to claim 16 , wherein the magnet armature is a tie rod or a hinged armature.