Sigres Rccbs (For Harsh Ambient Conditions) - Siemens SENTRON Manual

Residual current protective devices
4.4.6

SIGRES RCCBs (for harsh ambient conditions)

When residual current protective devices are used under severe environmental
conditions with increased emissions of corrosive gases, for instance in
• indoor swimming pools (chlorine gas; ozone),
• agriculture (ammonia),
• industry (sulfur dioxide)
the RCCBs are subject to a significantly higher load. These gases, in conjunction
with humidity, have a corrosive effect on all metal components and therefore also
on the metal surfaces of the holding magnet release.
The SIGRES residual current circuit breakers are suitable for such applications and
their patented active condensation protection feature gives them a significantly
longer service life. Direct heating of the holding magnet release produces a
slightly higher temperature on the metal components with only minimum power
required. Since condensation of the humid air enriched with corrosive gases is
thereby avoided, corrosion cannot take place, resulting in a longer service life of
the devices. A power supply is required for heating. If the RCCB is also used for a
longer period of time while in a disconnected state, the direction of the incoming
supply must be observed. This ensures that heating is possible in this case as well.
The protective function of the RCCB continues to remain absolutely independent of
the supply voltage as required by the product standard.
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