Siemens SIRIUS 3RA

Introduction
1
1.1 Responsibility of the user for system con󹪝guration and
functionality
Fuseless load feeders are device combinations comprising a 3RV2 motor starter protector for
overload and short-circuit protection and a 3RT2 contactor for normal switching.
The SIRIUS portfolio features two di󹪜erent con󹪝guration options for fuseless load feeders:
• 3RA2 tested pre-assembled complete devices
• Tested combinations of individual devices
Siemens AG, its regional o󹪟ces, and associated companies (hereinafter referred to as "Siemens")
cannot guarantee all the properties of an overall installation or machine that has not been
designed by Siemens.
Nor can Siemens assume liability for recommendations that appear or are implied in the
following description. No new guarantee, warranty, or liability claims beyond the scope of the
Siemens general terms of supply are to be derived or inferred from the following description.
Note
When designing a system, comply with all valid national installation speci󹪝cations and
standards.
1.2 Purpose of the manual
This manual describes the 3RA21/3RA22 fuseless load feeders and provides the following
information:
• Information about the di󹪜erent mounting variants of the fuseless load feeders.
• Information on necessary hardware components.
• Information on installing, connecting and operating the fuseless load feeders.
• Technical information such as dimension drawings and unit wiring diagrams.
The information in this manual enables you to con󹪝gure and commission the fuseless load
feeders.
SIRIUS 3RA Load Feeders
Equipment Manual, 02/2022, A5E03656507520A/RS-AC/004 7