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The VSD modules are devices designed to detect the presence or absence of voltage in the various circuits of a control centre controlled by a control module.

They are commonly used in public lighting installations where the main cause of outage is the tripping of the circuit protective elements (diferentials and magnetothermics) or the failure of the operating elements (contactors).

These devices operate on absence of voltage on any phase during the period in which the ignition control module gives the switch-on command.

By connecting to a control module SGC+or any other module able to issue a warning on activation of a digital input, the correct operation of the lighting installation can be known with no need for the intervention of auxiliary contacts in every constituent of the protection and control panel.

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