Classification of Transfer Switching Equipment to IEC 60947-6-1

Transfer switching equipment (TSE) is classified according to the short-circuit capability:

There are three different types of transfer switching equipment:

 

  • Automatic Transfer Switching Equipment (ATSE)
  • Manually Transfer Switching Equipment (MTSE)
  • Remotely Transfer Switching Equipment (RTSE)

 
There are thee different classes of transfer switching equipment:

  • Class CC: Is a TSE that is capable of making and withstanding, but is not intended for breaking short-circuit currents and is based on devices fulfilling the requirements of IEC 60947-4-1. This is usually by use of interlocked contactors.

 

  • Class PC:  Is a TSE that is capable of making and withstanding, but is not intended for breaking short-circuit currents and is based on devices fulfilling the requirements of IEC 60947-3. This is usually by use of a motorised switching device.

 

  • Class CB: Is a TSE that is capable of making, withstanding and is intended for breaking short-circuit currents and is provided with over-current releases and is based on devices fulfilling the requirements of IEC 60947-2. This is usually by use of motorised circuit breaker.

Class CC

Class CC

Class PC

Class PC

Class CB