Siemens Industry Online Support
Siemens AG
Entry ID: 109769424, Entry date: 10/28/2019

3KF switch disconnectors with fuses up to 800 A

  • Entry
3KF switch disconnectors with fuses protect against overload and short-circuits as main control and EMERGENCY-STOP switches of switchboard assemblies, power distribution boards, power supply and motor outgoing feeders. 3KF switch disconnectors with fuses are designed to switch the specified rated current on and off under load and provide an isolating function in all low-voltage circuits.

Example overview of components and accessory parts: 3KF LV HRC switch disconnectors with fuses in size 1

Position of operating mechanism modules

To allow optimum utilization of the available installation space, units with front operating mechanisms can be supplied with the operating mechanism module in various positions – mounted on the left-hand side of the 3KF switch disconnector with fuses or in the center between the switching poles. On units with lateral operating mechanisms, the operating mechanism module is positioned on the right or left-hand side.


  • 3KF LV HRC for standard applications and 3KF SITOR for protection of semiconductors
  • 5 sizes in 3 and 4-pole versions (4-pole versions for 3KF LV HRC series only)
  • Supplied as a complete assembly including direct operating mechanism or as a basic unit without a handle
  • Direct operating mechanism with handle on switch disconnector
  • Door-coupling rotary operating mechanism for operation of switch disconnector outside the control cabinet door 


  • Locking function helps to prevent unauthorized operation
  • Protection against inter-phase arcing
  • Compact design saves space
  • Wide variety of applications thanks to a range of different operating mechanism designs
  • Supplementary functions can be retrofitted
  • Various service positions are possible thanks to optimized heat dissipation
  • Test function to ensure safe commissioning
  • Comprehensive support through provision of CAx data
  • Protection against short-circuit and overload
  • Handle either as direct operating mechanism or door-coupling rotary operating mechanism:

Direct operating mechanism (left) or door-coupling rotary operating mechanism (right)


Catalog - Transfer Switching Equipment and Load Transfer Switches (Catalog Extract LV 10 • 04/2021)
Catalog - Switch Disconnectors (Catalog Extract LV 10 • 04/2021)
Catalog LV 10 • 04/2021 - Low-Voltage Power Distribution and Electrical Installation Technology
Order support - 3KF switch disconnectors with fuses - End-to-end safety for user and systems
Quick Selection Guide - Switch disconnectors and transfer switching equipment
Order support - 3KF switch disconnectors with fuses - End-to-end safety for user and systems
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