IEC 60512-9-5:2020

Overview

IEC 60512-9-5:2020 - "Connectors for electrical and electronic equipment - Tests and measurements - Part 9-5: Endurance tests - Test 9e: Current loading, cyclic" defines a standardized method to thermally condition and endurance-test solderless connections and connector terminations by cyclic current loading. This second edition (2020) replaces the 2010 edition and introduces a new flexible Method B in addition to the traditional Method A, to better accommodate products with larger thermal mass.

Key topics and technical requirements

• Scope and objective
  • Applies when called up by a detail product specification for connectors and solderless connections within IEC TC 48 scope; may be used for similar devices.
  • Objective: verify conductor & termination material, termination method (and tools) against thermal creep and loss of performance under repeated heating/cooling cycles.
• Test methods
  • Method A: traditional fixed duty cycle - time ON = 45 min, time OFF = 15 min (suitable for small connections, e.g., conductors ≤ 10 mm²).
  • Method B: adjustable ON/OFF determined experimentally during the first cycle; allows increased current or forced cooling to reach upper limiting temperature (ULT) and ambient more quickly - suited for larger thermal mass.
• Cycle definition
  • Time “ON” = interval to heat specimen from ambient to the specified ULT.
  • Time “OFF” = interval to cool back to ambient; ON+OFF = one cycle.
• Equipment and measurements
  • Requires a suitable current source (AC or DC), voltmeter, micro-ohm meter; output voltage must cover voltage drop across test circuit (daisy-chained specimens allowed if thermally independent).
  • Pre-conditioning under standard atmospheric conditions for 24 h before initial measurements.
  • Initial and final measurements (e.g., contact resistance, voltage drop) per relevant IEC 60512 parts.
• Specimen preparation
  • Specimens made with the relevant termination and conductor as per detail product specification; mounting and series wiring rules to avoid thermal interaction.

Applications and who uses it

• Useful for:
  • Connector designers and R&D teams validating termination designs.
  • Test engineers and laboratories performing reliability/endurance testing.
  • Manufacturers qualifying solderless terminations (crimps, press-fit, etc.) and conductor/tool combinations.
  • Compliance and quality teams referencing IEC test methods in product specifications and qualification plans.
• Practical benefits: identifies thermal degradation, creep-related contact failures, and confirms correct material/tool combination before production.

Related standards

• IEC 60352 series (Solderless connections)
• IEC 60512-1 (General), and related IEC 60512 parts for contact resistance and electrical/insulation tests (e.g., 60512-2-1, 60512-2-2, 60512-3-1).

Keywords: IEC 60512-9-5, cyclic current loading, endurance tests, solderless connections, connector testing, thermal stress, contact resistance, Method A, Method B, ULT.