What is BS EN 61076-2-101 - Specifications for circular connectors about? 
Electrical connectors are used to join electrical conductors to create an electrical circuit. BS EN 61076-2-101 is a part of an international multi-series standard that focuses on aspects of connectors for electronic equipment. BS EN 61076-2-101 describes M12 circular connectors typically used for industrial process measurement and control.
These connectors consist of fixed and free connectors either rewireable or non-rewireable, with screw-locking. The connectors with glass to metal seal are fixed connectors only which consist of fixed glass to metal sealed styles with rewireable male contacts and are intermate able with corresponding free connectors according to EN 61076-2-101.
Male connectors have round contacts ∅ 0,6 mm, ∅ 0,76 mm, ∅ 0,8 mm and ∅ 1,0 mm.
The different coding's prevent the mating of these coded male or female connectors to any other interfaces and cross-mating between the different coding's. M12 is the dimension of the thread of the screw-locking mechanism of these circular connectors.
Who is BS EN 61076-2-101 - Specifications for circular connectors for? 
BS EN 61076-2-101 on specifications for circular connectors is useful for: 
- Manufacturers of electronic devices 
- Maintenance and augmentation teams  
- Companies associated with designing and installation of electronic devices 
- Fault management teams
- Quality management teams
- Manufacturers and suppliers of electronic connectors
- Regulatory authorities
Why should you use BS EN 61076-2-101 - Specifications for circular connectors?
Electronic equipment is used in applications that rely on mechanical or electric systems for their operation. They are essential to any work on electronics systems for creating signals and capturing responses from electronic devices. There are certain specifications regarding the performance of electronic equipment. Electrical connectors are manufactured for power, data, and audio-visual applications. They can be differentiated by their specific method of connection, pinout, size, materials, contact resistance, mechanical durability, ingress protection, insulation and lifetime.
BS EN 61076-2-101 discusses the electrical, optical and mechanical characteristics of connectors that help users to manufacture good quality highly efficient electrical connectors. BS EN 61076-2-101 provides you with test schedules to verify the performance characteristics of connectors which ensures their reliability. BS EN 61076-2-101 also discusses safety aspects that help users to ensure the protection of the connectors and electronic devices.
The guidelines in BS EN 61076-2-101 enable you to provide a superior quality product to your customers.
What’s changed since the last update?
BS EN 61076-2-101:2012 supersedes EN 61076-2-101:2008. BS EN 61076-2-101:2012 includes some technical changes with respect to EN 61076-2-101:2008. These include: 
- The drawings of some styles have been corrected
- A new style with a maximum of 17 poles, with A-coding, has been added, as new applications for the industrial process measurement and control require a high number of poles in M12 circular connectors. The existing styles and dimensions which were specified in EN 61076-2-101:2008 are further applicable to the added interface dimension of the 17 poles versions
- Removal of the type designation and ordering information, former Tables 6 and 7 have been updated accordingly
- Inclusion of the technical content of IEC/PAS 61076-2-108, which will be withdrawn after the publication of BS EN 61076-2-101:2012. The drawings have been updated and a correction to the title of Figure 9 was made
