Siemens SIRIUS 3RT Manual page 263

Definition: DIN EN 50012
DIN EN 50012 defines the terminal designations and identification numbers for the auxiliary
contacts of certain contactors. The terminal designations of the auxiliary contacts match
those of the corresponding contactor relays with code E (according to DIN EN 50011). For
auxiliary contacts on contactors with the same identification number, the terminal
designations must be defined as per the order specified in the standard.
Switching order of auxiliary contacts
When contactors are switched on, with standard auxiliary switches the NC contacts are
opened first, then the NO contacts are closed.
Figure 9-6
Auxiliary switch blocks for contactor relays
The contactor relays with 4 contacts according to DIN EN 50011, with identification
code 40E, can be expanded by adding auxiliary switch blocks 80E to 44E, to give contactor
relays with 8 contacts according to DIN EN 50011. Identification codes 80E to 44E on the
auxiliary switch blocks apply to complete contactors. These auxiliary switch blocks (3RH29
11–1GA.) cannot be combined with contactor relays with identification code 31E or 22E;
these are coded. All contactor relays with 4 contacts according to DIN EN 50011, with
identification codes 40E to 22E, can be expanded by adding auxiliary switch blocks 40 to 02,
to give contactor relays with 6 or 8 contacts according to DIN EN 50005. The identification
numbers on the auxiliary switch blocks only apply to the attached auxiliary switch blocks.
Fully mounted 8-pole 3RH22 contactor relays are also available; the 4-pole auxiliary switch
block on the second level cannot be removed. The terminal designations comply with
DIN EN 50011.
Time-delayed auxiliary contacts
The 3RA28 function modules are available for applications which require time-delayed
auxiliary contacts.
Reference
More information ...
About the time-delayed switching of contactors
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
Switching auxiliary contacts
9.3 Auxiliary switch blocks
Can be found in the appendix ...
"References" under "Manuals - SIRIUS Modular
System (Page 497)" in the manual "SIRIUS -
SIRIUS 3RA28 function modules for mounting on
3RT2 contactors".
Accessories
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