Siemens SIRIUS 3RT Manual page 262

Accessories
9.3 Auxiliary switch blocks
Applicable standards
The auxiliary switch blocks can be fitted according to the following standards:
● DIN EN 50005: Definition of terminal designations; however, the order of the terminal
designations and the positions of the contacts can be determined by the user.
● DIN EN 50011 for contactor relays: Defined order for terminal designations and position
of contacts.
● DIN EN 50012 for power contactors: Defined order for terminal designations. The
positions of the contacts can be freely selected.
Note
Standard DIN EN 50012 is no longer valid, but is still used.
Definition: DIN EN 50005
The terminal designations for contactors are defined in DIN EN 50005, which contains
general rules. The following basic rules are defined therein for the contacts of auxiliary
circuits:
● The terminals of auxiliary contacts are identified by two-digit numbers.
● The units digit is a function number (NC contact: 1 and 2, NO contact: 3 and 4)
● The tens digit is a sequence number (all contacts with the same function must have
different sequence numbers)
Switching devices with a fixed number of auxiliary contacts (NO or NC contacts) may have a
two-digit identification number assigned to them. The first digit specifies the number of NO
contacts, the second the number of NC contacts. No rules have been defined as regards the
order of NO and NC contacts in the contactor/contactor relay.
Note
The identification numbers on the auxiliary switch blocks only apply to the attached auxiliary
switches.
Definition: DIN EN 50011
The main standard as regards the designations of contacts for auxiliary contactors is
DIN EN 50 011, which defines the terminal designations, identification numbers, and codes
of certain contactor relays, with a specified contact layout. The number, type, and position of
the contacts must be defined by means of an identification number and a subsequent code.
For 8-pole contactor relays, the code "E" means that four NO contacts must be arranged in
the bottom (rear) contact area.
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SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006