IEC 61076-2-104:2026

Overview

IEC 61076-2-104:2026 is an international standard published by the International Electrotechnical Commission (IEC) that specifies product requirements for circular connectors. These connectors feature M8 screw-locking or snap-locking mechanisms and are designed for electrical and electronic equipment supporting signal and power transmission. The standard defines connectors ranging from 3-way to 12-way configurations, which are suitable for use in automation devices with rated voltages up to 50 V AC or 60 V DC and a current carrying capacity up to 4 A.

This standard establishes criteria for safety, performance, dimensions, marking, testing, and compatibility, helping manufacturers and users ensure consistent and reliable connection technology within industrial automation and related sectors.

Key Topics

• Connector Types and Applications

  • Circular connectors with M8 screw-locking or ∅8 mm snap-locking
  • Suitable for automation devices and systems
  • Available as fixed or free connectors, both rewirable and non-rewirable

• Configurations and Electrical Ratings

  • 3-way to 12-way contact configurations
  • Rated up to 50 V AC / 60 V DC and 4 A current (depending on type)
  • Multiple coding options to prevent mis-mating

• Performance and Safety

  • Detailed test requirements ensuring quality and long-term reliability
  • Classification based on insulation, mechanical, and climatic criteria
  • Observance of safe creepage and clearance distances in accordance with IEC 60664-1

• Installation and Dimensions

  • Standardized interface and body dimensions for compatibility
  • Guidance for marking and orientation during assembly
  • Connector styles detailed for both straight and right-angled cable entries, as well as flange and single-hole mounting options

• Testing Requirements

  • Includes schedules for mechanical, electrical, and environmental tests according to relevant IEC methods

Applications

IEC 61076-2-104:2026 connectors are widely used in environments requiring robust signal and power connections, particularly where compact or modular assemblies are essential. Common application scenarios include:

• Industrial Automation:

  • Connecting sensors, actuators, and field devices within control cabinets and on the shop floor
  • Suitable for distributed control networks and modular systems needing quick and secure connections

• Process Control and Instrumentation:

  • Reliable interfacing for measurement equipment, programmable logic controllers (PLCs), and remote I/O modules

• Robotics and Machinery:

  • Supporting power and communication signals across moving and static equipment

• Transportation and Building Technologies:

  • Use in transportation systems, security, and building automation devices requiring standardized and ruggedized circular connectors

The standard ensures compatibility and interoperability in multi-vendor systems, minimizing installation errors and maintenance time. It supports the needs of equipment manufacturers, system integrators, and end-users by providing a clear basis for connector selection, integration, and quality assurance.

Related Standards

Compliance and integration with other international standards enhance the practical value of IEC 61076-2-104. Key related standards include:

• IEC 61076-1: Generic requirements, terminology, and definitions for connectors
• IEC 60512 Series: Test methods for electrical and electronic connectors, including mechanical operation and environmental testing
• IEC 60664-1: Principles and testing requirements for insulation coordination in low-voltage systems
• IEC 61984: Safety requirements and tests for connectors
• IEC 60050-581: Electrotechnical vocabulary for electromechanical components

Adherence to IEC 61076-2-104:2026 guarantees that circular connectors meet internationally recognized benchmarks for safety, quality, and performance in electrical and electronic equipment deployment.

For manufacturers, specifiers, and users, leveraging this standard ensures reliable automation solutions and future-proofs installations in dynamic industrial environments.