Technical FAQs

Ask a Question

What are the instantaneous operating times of a protection function?

The Sepam series 20 et series 40 manuals give the operating time for 2 types of outputs:

  • pick-up which is the non-confirmed instantaneous output: e.g. for phase O/C 50/51, T<35ms
  • instantaneous which is the output that can be used for tripping: this is the confirmed instantaneous operating time: e.g. for phase overcurrent protection 50/51, T<50ms


  • pick-up time is included in the specified operating time (the 2 times are not added together)
  • pick-up time is common to all the non-confirmed outputs of the protection functions in operation, according to the parameter setting of the matrix

Re-published to revised security level: 17 June 2008 by DRM

Applies To: Sepam 1000+ (Sepam Series 20 and Sepam Series 40)


All content © 1992-2008 Schneider Electric

Was this helpful?
What can we do to improve the information ?