Supplied to our customers since 1986, one of the most enduring and familiar of RWW Engineering’s MV products is the 22/33kV outdoor circuit breaker. Affectionately referred to as ‘The Dogbox’, this unit essentially comprises an indoor (fixed) 630A or 1250A 22kV circuit breaker within a mild or stainless steel enclosure.
External circuit connections are effected via roof mounted bushings. Its appeal lies in the fact that it can be configured to include CTs and VTs within the enclosure, thereby eliminating the need to install external outdoor CTs and VTs.
This feature helps minimise switchyard space requirements and reduce site installation costs. A generously sized LV controls compartment is provided with a pad lockable hinged door affording access to the CB controls and LV field wiring connections. The unit currently utilises the Merlin Gerin type SF1 (SF6 ) circuit breaker. Other circuit breakers can be used in custom applications.
The RWW outdoor ‘Dogbox’ circuit breaker is available in the following ratings: