Siemens SENTRON 3VA1, Руководство пользователя

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Applications
3.4 Use of 3VA1 molded case circuit breakers as switch disconnectors
3VA molded case circuit breakers with IEC certificate
166
Manual, 03/2019, A5E03603177010-03
Isolating features
A switch disconnector isolates individual circuits or items of equipment so that maintenance
or repair work can be carried out. This is a health and safety requirement.
In compliance with IEC 60947-3, the symbol below is clearly displayed on the front panel of
switch disconnectors:
In accordance with the requirements of the standard regarding isolating function, the 3VA1
switch disconnector features:
● the switch disconnector symbol
● a correctly dimensioned isolating distance in the OFF position
When the switch disconnector handle is in the OFF position, the isolating distance between
the main contacts is guaranteed to meet the requirements stipulated by standards pertaining
to isolating features. This also applies when manual or motor operators installed on the
disconnector are in the OFF position.
Only when the disconnector is in this safe position can it be locked by various methods (e.g.
door mounted rotary operator, motor operator). The 3VA1 molded case circuit breaker
therefore also meets the requirements for disconnector units according to IEC 60204-1 in the
capacity of a switch disconnector.