Selection Guide For Mountable Auxiliary Switch Blocks For Power Contactors And Contactor Relays - Siemens SIRIUS 3RT Manual

Accessories
9.3 Auxiliary switch blocks
9.3.1.3 Selection guide for mountable auxiliary switch blocks for power contactors and
contactor relays
Terminal designations and identification numbers for auxiliary contacts
Terminal designations
The terminal designations are 2-digit, e.g. 13, 14, 21, 22:
● Tens digit: Sequence number
– Related terminals have the same sequence number
● Units digit: Function number
– 1 to 2 for NC contact
– 3 to 4 for NO contacts
Identification numbers
The identification number indicates the number and type of the auxiliary contacts, e.g. 40,
31, 22, 13:
● First digit: Number of NO contacts
● Second digit: Number of NC contacts
Examples:
● 31 = 3 NO contacts + 1 NC contact
● 40 = 4 NO contacts

Selection guide for mountable auxiliary switch blocks for power contactors and contactor relays

The 3RH29 auxiliary switch blocks for mounting on the front and laterally can be used for
both the power contactors and the contactor relays.
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SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006