3KF switch disconnectors with fuses protect against overload and short-circuits as main control and ENERGENCY-STOP switches of switchboard assemblies, power distribution boards, power supply and motor outgoing feeders.

In conjunction with SITOR semiconductor fuses, they are also used in UPS systems, frequency converters and capacitor control systems.

3KF switch disconnectors with fuses are designed to switch the specific rated current on and off under load. At the same time, they constitute a safety isolating function and isolating distance in all low-voltage circuits.

All 3KF switch disconnectors with fuses are climate-proof and meet the requirements of IEC 60947-1, IEC 60947-3 and VDE 0660-107.

Features

• 3-pole and 4-pole versions in 5 different sizes
• 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 with fuses
• Door-coupling rotary operating mechanism for operation of switch disconnector outside the control cabinet door
• Versions with side wall operating mechanism left and right
• Connections in the form of box terminals or flat terminals
• Floor mounting or mounting on a standard mounting rail (size 1)
• Additional poles can be retrofitted: 4^th contact element, N or N/PE terminals
• Auxiliary switch for querying the switch positions
• Suitable for AC applications up to 690 V + 10% (wind power)
• Suitable for DC applications up to 440 V
• Suitable LV HRC fuse links up to 800 A
• Double contact interruption

Get more information

You find further information in our Product Information „3KF Switch Disconnectors with Fuses“ on http://www.siemens.de/lowvoltage/infomaterial