3KC3 and 3KC6 transfer switching equipment3KC3 and 3KC6 transfer switching equipment
Design of the 3KC3 and 3KC6 transfer switching equipment
3KC3 remotely operated transfer switching equipment (RTSE):

3KC6 automatic transfer switching equipment (ATSE):

① |
Terminals for bridging bar (3KC9618-2: 40…125 A / 3KC9618-3: 160 A) |
② |
3KC3: Box terminals for connection of source I (load side or line side) 3KC6: Box terminals for load-side connection |
③ |
3KC3: Box terminals for connection of source II (load side or line side) 3KC6: Box terminals for load-side connection |
④ |
Spring-loaded lugs for disassembly with standard rail mounting |
⑤ |
Motor operator |
⑥ |
Cover |
⑦ |
Assembly for wall mounting |
⑧ |
Fixing screws for standard rail mounting |
⑨ |
Auxiliary switch 3KC3 only: Scope of supply includes an auxiliary switch. A maximum of one additional auxiliary switch can be connected. 3KC6 only: Scope of supply does not include an auxiliary switch. A maximum of two auxiliary switches can be connected, see Figure for 3KC3. |
⑩ |
Plug-in assembly for attachable handle with switch position indicator |
⑪ |
Attachable handle for manual changeover |
⑫ |
Padlock assembly |
⑬ |
3KC3 only: Power supply for controlling the transfer switching equipment |
⑭ |
Inputs: 3KC3: 3 inputs for positioning command (I / O / II) 3KC6: 3 inputs for
and 1 output for source availability |
⑮ |
Indication of the selected source: O = Off; I = source I; II = source II |
⑯ |
3KC3: Box terminals for connection of source II (load side or line side) 3KC6: Box terminals for line-side connection of source II |
⑰ |
3KC3: Box terminals for connection of source I (load side or line side) 3KC6: Box terminals for line-side connection of source I |
⑱ |
3KC3: Cover of switching unit 3KC6: Control unit with operating and indicator elements |
⑲ |
Plug-in assembly for terminal cover (3KC9604-2) |
⑳ |
Handle extension with holder |
The 3KC6 automatic transfer switching equipment (ATSE) is based on the 3KC3 (RTSE) remotely operated transfer switching equipment. In contrast to 3KC3 transfer switching equipment, 3KC6 transfer switching equipment has an additional permanently integrated control unit with operating elements, indicator elements and an internal prewired power supply and source monitoring.
Unlike 3KC3 transfer switching equipment, which requires an external voltage source and source monitoring, 3KC6 transfer switching equipment requires no external voltage source and no source monitoring.
The control unit enables monitoring of two sources as well as automatic transfer switching.
Control unit (3KC6 only)
The control unit allows you to adjust the settings of the 3KC6 transfer switching equipment. A screwdriver is required for all settings.

Designation |
Function |
Meaning |
|
① |
- |
DIP switch for configuration |
|
② |
- |
Potentiometer:
|
|
③ |
I |
Availability of source I |
|
④ |
![]() |
Fault indicator |
|
⑤ |
AUTO |
"Auto" mode |
The "Auto" LED indicates automatic mode.
|
⑥ |
II |
Availability of source II |
|