SIRIUS 3RT2 contactors/contactor assemblies
2.7 Accessories
SIRIUS Innovations
166 System Manual, 01/2011, A8E56203870002-03
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.
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.
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RQ
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RII
RII
RII
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12
Figure 2-26 Switching auxiliary contacts
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