Design of the 3KC3 and 3KC6 transfer switching equipment

3KC3 remotely operated transfer switching equipment (RTSE):

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3KC6 automatic transfer switching equipment (ATSE):

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Terminals for bridging bar (3KC9618-2: 40…125 A / 3KC9618-3: 160 A)
and auxiliary conductor terminals (3KC9622-2)

3KC3: Box terminals for connection of source I (load side or line side)

3KC6: Box terminals for load-side connection

3KC3: Box terminals for connection of source II (load side or line side)

3KC6: Box terminals for load-side connection

Spring-loaded lugs for disassembly with standard rail mounting

Motor operator

Cover

Assembly for wall mounting

Fixing screws for standard rail mounting

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.

Plug-in assembly for attachable handle with switch position indicator

Attachable handle for manual changeover

Padlock assembly

3KC3 only: Power supply for controlling the transfer switching equipment

Inputs:

3KC3: 3 inputs for positioning command (I / O / II)

3KC6: 3 inputs for

  • positioning command O

  • priority setting

  • deactivation of automatic mode

and 1 output for source availability

Indication of the selected source: O = Off; I = source I; II = source II

3KC3: Box terminals for connection of source II (load side or line side)

3KC6: Box terminals for line-side connection of source II

3KC3: Box terminals for connection of source I (load side or line side)

3KC6: Box terminals for line-side connection of source I

3KC3: Cover of switching unit

3KC6: Control unit with operating and indicator elements

Plug-in assembly for terminal cover (3KC9604-2)

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.

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Designation

Function

Meaning

-

DIP switch for configuration

-

Potentiometer:

  • Setting of the transfer time delay for source failure and

  • Setting of the return switching time delay for prioritized source recovered.

I

Availability of source I

  • Shows a continuous green light if source I is available and is within the accepted tolerance.

  • Flashes if a timer is active.

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Fault indicator

  • Flashes red if there is an external fault (e.g. incorrect position of the neutral conductor).

  • Shows a continuous red light if there is an internal fault of the electronic module.

AUTO

"Auto" mode

The "Auto" LED indicates automatic mode.

  • Shows a continuous green light if the transfer switching equipment is in automatic mode and automatic operation is not inhibited.

II

Availability of source II

  • Shows a continuous green light if source II is available and is within the accepted tolerance.

  • Flashes if a timer is active.