IEC 60127-8:2018

Overview

IEC 60127-8:2018 (Edition 1.1, 2018 + AMD1:2024) defines requirements and test methods for miniature fuse-resistors with particular overcurrent protection rated up to AC 500 V and/or DC 500 V. It covers devices intended for printed circuits and other substrate systems used in electrical appliances and electronic equipment (normally for indoor use). The standard clarifies that these components act primarily as resistors and only interrupt current within a limited overcurrent range - therefore they are correctly named fuse resistors with particular overcurrent protection.

Key topics and technical requirements

• Scope and application limits
  • For printed-circuit and substrate-mounted fuse-resistors, indoor use; excludes special atmospheres (corrosive/explosive).
• Objectives
  • Establish uniform requirements, performance criteria and test methods to ensure safe use and interchangeability.
• Construction and ratings
  • Requirements for dimensions, terminations, alignment, through‑hole and surface‑mount versions, and rated dissipation.
• Electrical performance
  • Verification of resistance value, functioning characteristic (including tests at specified temperatures), rated breaking capacity and insulation properties.
• Test methods
  • Defined type tests and atmospheric conditions; tests include endurance, pulse tests, maximum sustained dissipation, dielectric strength and insulation resistance.
• Soldering and mechanical
  • Solderability, resistance to soldering heat, soldered-joint requirements and bending tests for surface-mount devices.
• Marking and documentation
  • Manufacturer markings and information to support replacement by components with similar dimensions and characteristics.
• Safety note
  • Fuse-resistors can safely interrupt high short‑circuit currents but are not designed to protect against sustained overloads - an accompanying overload protection device may be required.

Applications

• Use in consumer appliances, electronic equipment and component parts where compact overcurrent protection integrated with a resistor is desired.
• Typical uses: printed‑circuit assemblies, small power supply circuits, control electronics and component-level protection where rated voltage ≤ 500 V.
• Not intended for end-user replacement; intended for manufacturer-specified assembly and service.

Who should use this standard

• Electronic and appliance manufacturers designing PCBs and substrate systems.
• Component designers and fuse‑resistor manufacturers for design, testing and certification.
• Test laboratories and compliance engineers verifying performance, safety and interchangeability.

Related standards

• IEC 60127-1 (general requirements for miniature fuses) - IEC 60127-8 applies in addition to IEC 60127-1.
• Resistor standards referenced: IEC 60115-1, IEC 60115-4-101, IEC 60115-4-102 (manufacturers are responsible for compliance with resistor-related requirements).

Keywords: Miniature Fuses, Fuse-Resistors, Overcurrent Protection, IEC 60127-8, fuse resistors, printed circuit protection.