That is, a common terminal connects to either of two others, never connecting to both at the same time.For example, the old style telephone exchanges required make-before-break so that the connection didn't get dropped while dialing the number.The first application of relays was in long telegraph lines, where the weak signal received at an intermediate station could control a contact, regenerating the signal for further transmission.

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These rules for the safety design are the one that are defined in type B standards such as EN 13849-2 as Basic safety principles and Well-tried safety principles for machinery that applies to all machines.Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.Magnetic latching relays can have either single or dual coils.

Au bout de quelques lieues, on trouva un relais préparé exprès à l'avance pour les nobles voyageurs.In a low-voltage application this reduces noise; in a high voltage or current application it reduces arcing.For many years relays were the standard method of controlling industrial electronic systems.