If your search for "iec 603525 pdf" was a typo for , you are looking at the most important safety standard for household electrical appliances worldwide.

It defines how a "press-in zone" (part of a connector terminal) is inserted into a plated through-hole (PTH) on a PCB. The deformation of the pin within the hole creates a high-pressure contact that is both electrically conductive and mechanically robust. Key Updates in the Latest Edition (2020)

Microsectioning (cross-sectional analysis) is performed to examine the interface between the pin and the PTH. Technicians look for: Adequate deformation of the compliant zone. Continuous contact areas (gas-tight zones). Absence of severe damage to the PCB copper wall. Electrical Testing

Precise schematics showing how to fixture PCBs for pull-out testing.