Auxiliary Switch Blocks; Auxiliary Switch Block For 3Rt2 Power Contactors And 3Rh2 Contactor Relays; Description - Siemens SIRIUS 3RT Manual

9.3

Auxiliary switch blocks

9.3.1

Auxiliary switch block for 3RT2 power contactors and 3RH2 contactor relays

9.3.1.1

Description

Function
The 3RH21 contactor relays and 3RT2 power contactors in size S00 feature an integrated
auxiliary contact. The 3RT2 power contactors in sizes S0 to S3 have an integrated NO
contact and an NC contact. Attachable auxiliary switch blocks can be used to add up to four
further contacts to the auxiliary contacts already integrated in the basic devices.
Versions and designs
The auxiliary switch blocks for expanding the auxiliary contacts are available with screw-
type, spring-loaded, and ring cable lug connections, in the following designs:
● On the front (uniform for sizes S00 to S3)
● Lateral (size-specific)
To facilitate wiring in the load feeder, 1-pole and 2-pole auxiliary switch blocks for mounting
on the front are offered. Optionally, devices with connection from above or below are
available. The 1-pole or 2-pole auxiliary switch blocks mounted on the front with connection
option from below or above have fixed location identifiers. These auxiliary switch blocks are
only supplied with screw connections. For spring-loaded connection, 4-pole auxiliary switch
blocks are offered that are only fitted with auxiliary contacts 1 and 2.
The 3RT2 power contactors and the 3RH21 contactor relays can be expanded by means of
auxiliary switch blocks mounted on the front or the side.
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
Accessories
9.3 Auxiliary switch blocks
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