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 aects 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
(
https://support.industry.siemens.com/My/ww/en/requests).
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 nd more information and an option to download
certicates on the Internet (https://support.industry.siemens.com/cs/ww/en/ps/16364/cert).
System overview
3.2 Application planning
SIRIUS 3UG4 / 3RR2 monitoring relay
22 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
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