Product category
Voltage monitoring
Data Sheets

When the lights fail in public buildings (such as schools) because of undervoltage, the emergency lighting systems must be activated in publicly accessible areas.

Solution description

The voltage relay monitors the 3 phases of the supply voltage in the switch cabinet.
When the voltage level falls below the set threshold of 85% of the nominal voltage in one of the 3 phases, an installation contact switches the emergency lights on.
When the supply voltage returns to the nominal level, the emergency lights are then switched off after a short delay (implemented with a delayed-action timing relay) and the normal lighting system is switched on.

Benefit/added value

– Personal protection / prevention of accidents
– Indication of undervoltage / the failure of each individual phase
– Fulfils the VDE 0108-100 and VDE 0100-718 standards

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