Product description
3.4 3RA28 function modules
SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
24
Manual, 02/2019, A5E03656507620A/RS-AD/005
3.4
3RA28 function modules
Function module for direct-on-line start (electronic timing relays with semiconductor output/solid-state
time-delay auxiliary switches)
1
Timing relay attachment
2
Time range selector switch:
Sets the time base (1 s, 10 s, 100 s)
3
Operating time adjustment switch: Sets the relative time (5 to 100%)
4
Mechanical plunger:
Indicates the switching state of the contactor
5
Screw/spring-loaded terminals:
The terminals are available as both screw-type and
spring-loaded connections.
Figure 3-2
Electronic timing relays with semiconductor output/solid-state time-delay auxiliary
switches
Function module for star-delta (wye-delta) start
The function module for star-delta (wye-delta) start comprises a basic module with integrated
control logic and two coupling modules of the same type.
1 Basic module with integrated control logic
2 Coupling module
3 Coil control:
Basic module: Voltage measurement at the line contactor
Coupling module: Controls the contactor below
4 Ribbon cable:
Electrical connection of modules
5 Slot for connecting cable:
Routes the supply voltage and electrical interlock
6 Time range selector switch:
Sets the time base (10 s, 30 s, 60 s)
7 Operating time adjustment switch:
Sets the relative time (5 to 100%)
8 Mechanical plunger:
Indicates the switching state of the contactor
Figure 3-3
Basic module and coupling modules for the contactor assembly for star-delta (wye-delta)
start
