Safety relays

In the machine- and plantbuilding sector the safety becomes more and more important. Everywhere, safety modules and also safety control systems are used.

Despite the increasing use of semiconductor relays, the electromechanical relays are still an important part.

Here these special relays find their application.

The safety relays or relays with positive guided contacts have at least one normally closed contact and one normally open contact. The normally closed contact and the normally open contact are never closed together.

Also the relay has to guarantee during its life a contact distance of 0,5 mm in operation and also in case of failure.

Due to this feature a primary monitoring function identifies if a contact breaks down.

Eg.: If a normally open contact is welded the corresponding normally closed contact is not able to close when switching off the supply voltage.

Applications: