IEC 60127-7:2015

Overview - IEC 60127-7:2015 (Miniature fuse-links for special applications)

IEC 60127-7:2015 is Part 7 of the IEC 60127 series and specifies requirements and uniform test methods for miniature fuse-links for special applications. It applies to miniature fuse-links with a rated voltage not exceeding 1 000 V, a rated current not exceeding 20 A, and a rated breaking capacity not exceeding 50 kA. This second edition (2015) replaces the 2013 edition and is intended to be read in conjunction with IEC 60127-1:2006 (general definitions and requirements).

Key topics and technical requirements

• Scope and exclusions
  • Covers enclosed miniature fuse-links not covered by IEC 60127-2/3/4 and excludes devices intended for corrosive or explosive atmospheres or items already covered by IEC 60269-1 parts.
  • Fuse-links covered are typically not intended to be replaced by the end-user.
• Uniform test methods
  • Establishes standard procedures to verify manufacturer values such as melting time, breaking capacity, and endurance.
  • Includes breaking capacity tests (a.c. and d.c.), endurance tests, dissipation measurements and other electrical verifications.
• Test hardware and schedules
  • Introduces a test board for surface-mount fuse-links (Figure 2) and a standard test board for wire-terminated fuse-links (Figure 1).
  • Defines testing schedules for homogeneous series, enabling efficient qualification of series of related ampere ratings.
• Construction, marking and ratings
  • Specifies dimensional and construction considerations, marking requirements and which ratings must be agreed between manufacturer and test house (rated voltage, rated current, breaking capacity, time/current characteristic).
• Normative references
  • Intended to be used with IEC 60127-1 and references environmental, flammability and insulation coordination standards (e.g., IEC 60068, IEC 60695, IEC 60664).

Practical applications and who uses this standard

• Fuse manufacturers - design and qualify miniature fuse-links for special applications and to establish consistent datasheet values.
• Test laboratories and certification bodies - perform standardized tests and verify manufacturer claims for melting times and breaking capacity.
• Product designers and OEMs - select appropriate miniature fuse-links for electronic appliances, power supplies and PCB-mounted protection where end-user replacement is not intended.
• Safety and compliance engineers - ensure products meet international safety testing, marking and performance requirements.

Related standards

• IEC 60127-1 (definitions and general requirements) - essential companion document
• IEC 60127-4, -6 (related fuse types and holders) and applicable environmental and flammability standards (IEC 60068, IEC 60695, IEC 60664)

Keywords: IEC 60127-7:2015, miniature fuse-links, rated voltage not exceeding 1 000 V, rated current not exceeding 20 A, rated breaking capacity not exceeding 50 kA, surface-mount test board, homogeneous series, breaking capacity tests.