Safety relays ensure optimal protection for persons and equipment

Hengstler safety relays are the switching technology of choice in many applications in railway and elevator technology.

They enable the structuring of safety-relevant systems in accordance with SIL3 and SIL4 with much lower costs than with semiconductor relays.  At the same time, relays with positively driven contacts offer optimal protection for persons and equipment.  

Controls with safety relays immediately detect when a component of relay in a circuit is defective.  If there is a failure, the system can be switched off using a second redundant safety relay.  The positively charged contacts then prevent defective machines from being turned on and thus ensure a safe status.  As the inventor of relays with positively charged contacts, Hengstler has considerable know-how in the field of safety switching and any well-known companies can be found among its clientele.

Hengstler relays with positively driven contacts have significant advantages over relays with positively driven contacts, especially in railway and elevator technology.  If the safety switching has been designed correctly, much simpler devices and systems for SIL3 and SIL4 can be implemented using safety relays.  This is not only due to the lower unit costs of the relays, but also their lower power loss and their manageable technology which reacts clearly and predictably in the event of a fault.  This means that it is much easier to integrate safety relays into complex applications than semiconductor relays.   Hengstler safety relays are used all around the world, such as in door controls of trains and elevators, in railway signal technology, in the safety equipment of locomotives and in braking systems.