The circuit switcher was born in the USA to switch and protect transformers and, more generally, loads (reactors, lines, cables...), as an alternative to dead tank circuit-breakers which are definitely more expensive.
It is provided with a “puffer type”, SF6 interrupting chamber and with an operating mechanism which allows for both motor and manual operation.
It is characterized by the presence of a shunt trip, which is a stored-energy spring device driven by a trip coil, which allows for quick opening of the chamber ensuring phase synchronous operation.
It is more versatile than a traditional circuit-breaker since it allows different types of mounting (horizontal, vertical, on pole...).
The following models are available:
The CSH-VB type allows creating compact solutions (much smaller than traditional ones based on “circuit-breaker + disconnector” configurations), which are suitable for installation either on trailers (mobile substations) or on pole and can even include instrument transformers and surge arresters.
Moreover, the CSH-VB type is provided with one single operating mechanism for both devices, which prevents the risk of performing erroneous operation sequences.
Rated voltage: 36 - 245 kV
Rated continuous current: up to 2000 A
Rated short-time withstand current: up to 40 kA (3 s)
Rated breaking capacity: up to 2000 A
Rated short-circuit breaking capacity: up to 40 kA
Rated short-circuit making capacity: up to 40 kA
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