Product Description - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RA28 function modules for mounting on 3RT2 contactors

7.2 Product description

7.2 Product description
Applications
Function modules are used to perform various control jobs on automatic production lines and
for processing machines. They are suited to all time-delayed switching operations in control,
starting, protection, and regulation circuits, and ensure a high degree of repeat accuracy for
delay times, once they have been set.
Function modules are divided into those with a communication connection and those without
a communication connection.
Function modules
3RA28 function modules
3RA27 function modules with communication
connection
This chapter describes 3RA28 function modules without a communication connection. You
will find information about function modules with a communication connection in the
corresponding manuals (see Reference).
Function
Function modules are used to delay switching functions.
System integration
The 3RA28 function modules have been matched to the contactors in the 3RT2 and 3RH2
series both electrically and mechanically and can be integrated in the feeders by directly
mounting them on contactors. The function modules can be used for size S00/S0 contactors.
The 3RA27 function modules can only be used for communication-capable contactors.
Connection system
Users can choose either function modules with screw-type connection system or function
modules with spring-loaded connection system.
Reference
More information ...
About 3RA27 function modules for AS-Interface
About 3RA27 function modules for IO-Link
About function modules for reversing starting
642
Solid-state timing relays with semiconductor
output
Solid-state time-delay auxiliary switches
Function module for star-delta (wye-delta) start
Function modules for AS-Interface
Function modules for IO-Link
Is available in ...
Manual "Function Modules for AS-Interface"
(http://support.automation.siemens.com/WW/view
/en/39318922) (3ZX1012-0RA27-0AC0)
Manual "Function Modules for IO-Link"
(http://support.automation.siemens.com/WW/view
/en/39319600) (3ZX1012-0RA27-1AC1)
The chapter titled SIRIUS 3RT2
contactors/contactor assemblies (Page 110)
System Manual, 01/2011, A8E56203870002-03
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