Static Changeover Unit

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 Unit fails. 1, 2, 3 and 4 way sub-circuit monitors (with 10 amp hold-off relays) are available.

Changeover functionality is required when the use of a switched maintained system is used to energise the emergency lighting when required by operation of the local switched supply but automatically illuminate in the event of local sub-circuit supply failure (irrespective of the position of the local switch).