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Static Changeover Unit

Static Changeover Unit

Ventilux (UK)

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It is a mandatory requirement that emergency lighting is energised in the event of a local sub-distribution failure, not just on total building supply failure. The Static Changeover Unit offers both a sub-circuit monitoring Hold-off or Change Over function. Hold-off functionality is required to monitor the relevant mains lighting supply circuits such that a failure brings on the emergency luminaires automatically in the event of local supply failure. Non maintained luminaires are connected to Static Change Over unit. These luminaires are only energised when the supply to the Static Change Over

Ventilux (UK)'s own words, read from their page.

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The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.