IEC 60512-9-3:2011 defines a standard test method to assess the mechanical and electrical operational endurance, i.e. engaging and separating cycles, of a connector in an operating mode which includes a specified electrical load. This second edition cancels and replaces Test 9c of IEC 60512-5, issued in 1992, and constitutes a technical revision. The main technical changes with regard to the previous edition are as follows:
- An additional requirement to 4.1 stating that if more than one electrical circuit is wired for testing, the wiring shall be carried out in a parallel electrical circuit.
- Subclauses 4.3 through 4.7 were removed and replaced by 4.2 through 4.4.

This publication is to be read in conjunction with IEC 60512-1:2001 and IEC 60512-1-100:2006.