SIRIUS 3RU thermal overload relays / SIRIUS 3RB electronic overload relays
Manual, 09/2016, A5E03656507420A/RS-AB/003
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Responsibility of the user for system configuration and functionality
3RU21 thermal overload relays have been designed to provide current-dependent protection
for loads with normal starting against impermissibly high temperature rises due to overload,
phase asymmetry or phase failure.
3RB20 / 3RB21 and 3RB30 / 3RB31 electronic overload relays with internal power supply
have been designed to provide current-dependent protection for loads with normal starting
and heavy starting against impermissibly high temperature rises due to overload, phase
asymmetry or phase failure.
Siemens AG, its regional offices, 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
With regard to the design of a system, comply with all valid national installation specifications
and standards.
This manual describes the 3RU2 and 3RB2 / 3RB3 overload relays and provides the
following information:
● Information for integrating the overload relays into the system environment.
● Information on necessary hardware components.
● Information on installing, connecting and operating the overload relays.
● Technical information such as dimension drawings and unit wiring diagrams.
The information in this manual enables you to configure and commission the overload relays.
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