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 The following barriers have built-in overvolt protection, allowing their

use with unregulated power supplies. In many applications, eg, sensor
inputs or controller outputs, there is insufficient power available to
blow the barrier fuse and this additional protection is not necessary.
However, where the barrier is connected to a power supply, eg, for
energising transmitters, switches, solenoids or local alarms, overvolt
protection allows the barriers to be used with unregulated supplies
and also gives protection against faulty wiring during commissioning.