IEC 63522-39:2025 is used for testing all kind of relays and shall evaluate their ability to perform under expected conditions of transportation, storage and all aspects of operational use.

This document defines standard test methods for:

1. measuring the insertion and withdrawal forces of the mating relay and socket

2. measuring the insertion and withdrawal forces on relays with flat quickconnect terminations

3. verifying the correct connection of flat terminals with eye lug connectors.