The voltage signaling relay of the type 8591 has been developed particularly for the detection and signalling of the voltage states of DC traction power supply systems. (Auxiliary supply is not needed for the operation of this device.)
Due to the special design the big voltage tolerances occurring during rail operation are unproblematic for the voltage signal relay of the type 8591.
This relay stands out due to its fully encapsulated construction. It is connected to the contact line and the return conductor or the voltage source via firmly moulded cables.
The output contacts (1 or 2 change-over contacts) are encapsulated hermetically and therefore protected against corrosion.
The design offers the best possible protection of the output side against surges of atmospheric origin, which might come from the input side. This also applies to the separation of the contacts, change-over contact against change-over contact.
According to section 60 of VDE 0100 concerning auxiliary circuits short-circuit protection is not required for a voltage signal relay if the connecting cables have been laid in a short-circuit proof way. Therefore, the voltage signal relay should always be ordered with the cable lengths needed for the connection to the voltage and the return conductor.
Polarity need not be observed for the connection of the voltage signal relay. Thus, the cable routing can be optimised to the local conditions. The principles of overvoltage protection have to be observed by the installation.
The output contacts are designed as reed contacts. Under no circumstances shall the limit values be exceeded for this kind of contact. Particularly the capacitive inrush currents and the lamp loads have to be considered (see information sheet concerning reed contacts).
Data sheet [PDF]
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