Siemens Industry Online Support
Siemens AG
Entry type: Product note Entry ID: 109773123, Entry date: 11/15/2019

Delivery release: 3KD switch disconnectors up to 2000 A: current rating expansion of all 3KD frame sizes, improved techical values

  • Entry
  • Associated product(s)
The 3KD product family will be expanded by further switches with smaller dimensions: for all five frame sizes, 1 or 2 higher current ratings are to be introduced. The 3KD will be available up to 2000 A soon. In addition, many technical data for all 3KD switch disconnectors are improved.

The new introduced switch disconnectors have smaller dimensions and a lower price position compared to the already existing 3KD switch disconnectors.
Due to this introduction, the customer has the benefit to choose between products with higher technical data but bigger dimensions or a product with lower technical data but significantly smaller dimensions.

The attached table shows an overview of the technical data of 3KD. The data colored in red are new or have been improved. Mostly the following data is concerned:

  • switching without load:

 AC-20 A values at 1000 V
 DC-20 A values at 1000 V

  • switching under load:

 AC-21 A und AC-22 A Werte bei 1000 V

  •  improved short cicuit values
  •  short circuit values with series-conducted MCCB (3VA)
  •  higher endurance values


Target market:



smaller dimensions, lower price positioning, improved technical data




 Registrierung notwendig  3KD_technical_data_201911107.xlsx (31,5 KB)

 Registrierung notwendig  Graph.xlsx (12,3 KB)

  Quick-Selection-Guide-Help_3KD_EN.pdf (458,1 KB)

Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit