Siemens Simantic ET200SP System Manual page 128

Wiring
5.14 Mounting/disassembly of motor starters
4. Turn the mechanical rotary interlock clockwise to the operating position (= end position).
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③
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Operating position/READY
The motor starter is firmly locked in the BaseUnit, and all electrical contacts are connected.
Assembly/disassembly position
All electrical contacts are open, and you can use the SIMATIC ET 200SP motor starter in
the BaseUnit, or you can remove it from the BaseUnit.
Parking position/OFF
In this position, you cannot remove the SIMATIC ET 200SP motor starter
from the BaseUnit, but all electrical contacts are open. In addition, you
can open the locking lever on the mechanical rotary interlock in this
position, and fix the position with a padlock (shackle diameter 3 mm).
This ensures the isolating function in accordance with IEC 60947-1.
Operating position/READY
The motor starter is firmly locked in the BaseUnit, and all electrical contacts are connected.
Distributed I/O system
System Manual, 12/2016, A5E03576849-AG