Siemens SIRIUS 3RT Manual page 289

Solid-state compatible auxiliary switch blocks
Solid-state-compatible auxiliary switch blocks feature two encapsulated contacts, which are
particularly well suited to switching low voltages and currents (hard gold-plated contacts) and
for operation in dusty atmospheres. The rated operational current is I
1 to 300 mA, voltage: 3 to 60 V.
The solid-state compatible auxiliary switch blocks for mounting on the front are available with
screw-type, spring-loaded, and ring cable lug connections. The laterally mountable solid-
state compatible auxiliary switch blocks are available with spring-loaded connections.
Sizes S6 to S12 (3RH1921-.FE22): equipped with two enclosed auxiliary contacts and two
standard auxiliary contacts, 1 NO contact + 1 NC contact respectively.
Auxiliary switch blocks with overlapping contacting
Auxiliary switch blocks with overlapping contacting are available with screw-type and spring-
loaded connections. The table below shows the versions of the auxiliary switch blocks
available with overlapping contacting.
Table 9- 14
Size S6 ... S12
3RH1921-.FC22
3RH1921-1CD01
3RH1921-1CD10
Expansion of auxiliary switch equipment
The contactors of sizes S6 to S12 are equipped with lateral 2-pole auxiliary switch blocks.
● Air-break contactors and vacuum contactors with conventional / electronic operating
mechanism: 2 NO contacts + 2 NC contacts
● Air-break contactors with remaining lifetime signal: 1 NO contact + 1 NC contact
The devices can be expanded with laterally-mounted auxiliary switch blocks (for air-break
contactors and vacuum contactors) or front-mounted auxiliary switch blocks (for air-break
contactors only).
The table below shows the expansion options for contactors in sizes S6 to S12.
Size
S6 to S12
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
Auxiliary switch blocks with overlapping contacting
Auxiliary switch version
22U
01
10
Auxiliary switch block
1-pole and 4-pole (can be mounted on the front)
•
2-pole (laterally mountable)
•
Feeder auxiliary switch (can be mounted on the
front):
2-pole (1 NO contact + 1 NC contact)
•
2-pole (2 NO contacts or 2 NC contacts)
•
Cable entry from top or bottom possible
2 NO contacts + 2 NC contacts
1 NC contact, lagging
1 NO contact, leading
Accessories
9.3 Auxiliary switch blocks
/AC-14 and DC-13:
e
Connection system
Screw-type connection system
Spring-loaded connection
system
Screw-type connection system
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