IEC 60127-3:2015

Overview

IEC 60127-3:2015 (with Amendment 1) specifies requirements and additional test methods for sub‑miniature fuse‑links adapted to printed circuits. It complements IEC 60127-1 and is intended for sub‑miniature fuse‑links used for the protection of electric appliances, electronic equipment and component parts normally used indoors. It excludes fuse‑links for special environments (for example, corrosive or explosive atmospheres). This edition adds alternatives in fuse shape and ratings and updates test and marking provisions.

Key topics and requirements

• Scope and application: Applies to sub‑miniature fuse‑links adapted to printed circuit boards (PCBs) for indoor appliance and electronic equipment protection. Read together with IEC 60127-1.
• Standard sheets and ratings: Standard sheets 1–4 define form factors and test schedules; amendment adds rectangular and small cartridge alternatives and extends rated currents up to 10 A for sheets 2–4.
• Marking: Fuse‑links may be marked on the top for rated current, rated voltage and time/current characteristic (sheets 3 and 4). Where marking is impractical, required information should appear on the smallest package and in manufacturer literature (new Subclause 6.5).
• Test methods and schedules: Defines quantities and testing schedules (for example, 66 samples for certain individual ratings, 51 for others, with spares) and special tests such as termination robustness and breaking capacity. Extra samples for termination tests (E1–E6) are now chosen at random rather than sorted by voltage drop.
• Test fixtures and materials: Specifies PCB test board construction (epoxide woven glass fabric copper‑clad laminate per IEC 61249‑2‑7), fuse‑base materials and mounting arrangements to ensure consistent test conditions.
• Normative references for testing: Includes related test standards (IEC 60068‑2‑21 for termination robustness, IEC 60695‑11‑5 for needle‑flame testing, etc.).
• Electrical and mechanical clauses: Covers dimensions, construction and electrical behavior including breaking capacity and time/current characteristics (see Clause 9 and Annex A for DC options).

Applications and who uses this standard

• Manufacturers of sub‑miniature fuse‑links and PCB‑mounted fuses
• PCB designers and electronic equipment OEMs specifying overcurrent protection for appliances and consumer electronics
• Compliance engineers, test laboratories and certification bodies performing type and routine testing
• Purchasing and quality teams verifying vendor data and marking/packaging information

Practical benefits include consistent safety and performance levels for PCB‑mounted fuse solutions, harmonized test methods for reliability, and clear marking/packaging guidance for constrained form factors.

Related standards (if applicable)

• IEC 60127‑1: Definitions and general requirements (mandatory companion document)
• Other IECs referenced: IEC 60068‑2‑21, IEC 60695‑11‑5, IEC 61249‑2‑7
• The IEC 60127 series provides broader context for cartridge, modular and special‑application miniature fuses.