System overview
3.2 Application planning
3UG4 / 3RR2 monitoring relays
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Manual, 05/2016, NEB927043002000/RS-AC/004
3.2
Application planning
The following information must be taken into account when planning applications involving
the SIRIUS monitoring relays.
Installation altitude
The monitoring relays are approved for installation altitudes up to 2,000 m. The reduced air
density at altitudes higher than 2,000 meters affects the electrical characteristics of the
monitoring relays. The reduction factors which have to be taken into account when using
monitoring relays at altitudes higher than 2,000 m can be obtained on request on the Internet
www.siemens.com/automation/csi_en
Operating conditions and resistance to extreme climates
The monitoring relays are climate-proof. They are intended for use in enclosed spaces in
which no severe operating conditions prevail (e.g. dust, caustic vapors, hazardous gases).
Appropriate measures must be taken when installing in areas subject to dust and humidity.
Condensation on the devices is not permissible.
Special application environments
The SIRIUS devices have been approved by a whole range of bodies for various sectors
(shipbuilding, etc.). An up-to-date list of approvals is provided in Chapter 10 of the Catalog
IC 10 - SIRIUS "Industrial Controls." You will find more information and an option to
download certificates on the Internet (