Safety switch for monitoring a closed position of two parts moveable relative to one another

A safety switch for monitoring a closed position of a guard door in an automated installation, said guard door comprising a fixed part and a moveable part, and the safety switch comprising:

• an actuator and a sensor each adapted to be secured to one of the parts,
• wherein the actuator has a transponder including an actuator antenna and the sensor has a sensor antenna,
• wherein the antennas are configured to establish a transponder coupling, when the parts are in the closed position,
• wherein the sensor antenna has a magnetic directional characteristic which allows the transponder coupling in at least two spatial directions that are mutually perpendicular as seen from the sensor antenna, and further
• wherein the magnetic directional characteristic comprises a stronger first preferential direction and a weaker second preferential direction allowing the transponder coupling, wherein the sensor antenna is arranged in an antenna housing having housing walls, and wherein a distance between the sensor antenna and the housing walls in the first preferential direction is longer than in the second preferential direction.