Rc Units For Installation On Miniature Circuit Breakers; Sigres Rccb (For Harsh Ambient Conditions) - Siemens SENTRON Instructions Manual

4.4.5 RC units for installation on miniature circuit breakers

RC units are suitable for installation on miniature circuit breakers in accordance
with EN 61009-1 (VDE 0664-20):2000-09, appendix G. The customer can combine
these RC units with an appropriate miniature circuit breaker to generate the same
functionality as the factory-built RCBOs.
A large number of different combinations can be made up from the available RC
unit and miniature circuit breaker product ranges without having to stock a large
number of products. This results in important advantages:
• High degree of application flexibility
• Customized combination of device features from RC unit (rated residual current,
instantaneous or selective) and miniature circuit breaker (rated current, charac-
teristic, switching capacity)
• The device combination offers all advantages of an RCBO as regards electric-
shock, fire and line protection

4.4.6 SIGRES RCCB (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),
• farming (ammonia),
• industry (sulfur dioxide)
they 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 operated circuit breakers are suitable for such applica-
tions and their patented active condensation protection feature gives them a signi-
ficantly 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 (from below) must be observed.
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