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PD IEC PAS 61076 — Connectors for Electronic Equipment Product Requirements PAS Series (M8 Circular and Rugged 8-Way Shielded Connectors)
Publicly Available Specifications (PAS) — Part 2-114: M8 screw-locking circular connectors; Part 3-122: rugged 8-way shielded free and fixed connectors
🔌 PD IEC/PAS 61076 comprises the UK adoption of publicly available specifications (PAS) published under the IEC 61076 family, which covers connectors for electronic equipment — product requirements. A PAS is a pre-standard publication issued to respond to an urgent market need; it is published quickly and is normally reviewed for possible conversion into a full International Standard within three years. The two parts in this series sit in different sub-families of IEC 61076: Part 2-114 belongs to the circular connector sector of Part 2 (detail specifications), while Part 3-122 belongs to Part 3-1xx, which covers rectangular connectors, although the rugged 8-way connector it specifies is mechanical-interface oriented. Both documents were prepared under IEC Technical Committee 48 (Electromechanical components and mechanical structures for electronic equipment) and adopted by BSI through Committee EPL/48.
💡 A “detail specification” in the IEC 61076 structure fixes all dimensional, mechanical, electrical and environmental characteristics of one specific connector design. End users and designers can treat such a spec as a complete procurement and qualification document without guessing at interface data.
1. Scope and Series Structure 📌
The IEC 61076 standard family is organized by product class: Part 1 sets generic specification and common test and measurement methods; Part 2 covers circular connectors; Part 3 covers rectangular connectors; later parts address additional types such as board-mounted and shielded connectors. Publicly Available Specifications in this family are numbered within the corresponding part (e.g. 61076-2-1xx, 61076-3-1xx). This PD series consists of two documents:
| Document | Edition | Subject | UK Publication |
|---|---|---|---|
| PD IEC/PAS 61076-2-114:2016 | Ed. 1.0 (2016-05) | Circular connectors — detail specification for data and power connectors with M8 screw-locking | 2016-05 |
| PD IEC/PAS 61076-3-122:2015 | Ed. 1.0 (2015-03) | Detail specification for rugged 8-way, shielded, free and fixed connectors | 2015-03 |
Both are ICS-classified at 31.220.10 (plug and socket devices, connectors). As Published Documents they reproduce the IEC text for UK use and are administered by the BSI Electrotechnical Sector Committee.
⚠️ PAS documents are pre-standards: they may contain requirements that are still being consolidated, and they can be withdrawn if superseded. Always check the current status (valid / withdrawn / transformed into an IEC standard) before locking a design to a PAS reference.
2. Part 2-114 — M8 Screw-Locking Circular Connectors 🔩
IEC/PAS 61076-2-114:2016 defines a detail specification for circular connectors with M8 screw-locking used for data and power transmission. M8 circular connectors are widely used in sensors, actuators, field instrumentation and small industrial equipment where a compact, IP-rated, screw-locking interconnect is required. The specification covers:
- Performance and compatibility levels according to IEC 61076-1:2006, giving the basis for rating the connector in its operating environment;
- Climatic categories (Table 1) classifying the connector into temperature and humidity categories that define its operating envelope;
- Creepage and clearance distances, which determine the working voltage capability and safety margins;
- Current-carrying capacity for the power contacts, relevant for power-over-connector applications;
- Dimensional information: isometric views, common features, reference system, and gauging/mating dimensions for both plug (free) and receptacle (fixed) versions;
- Marking requirements for identification and traceability.
💡 M8 connectors are the “small brother” of the ubiquitous M12 series. They are chosen when space is tight yet a screw-locked, vibration-proof connection is still required — typically in sensors, IO-Link devices, and compact servo/solenoid applications.
3. Part 3-122 — Rugged 8-Way Shielded Connectors 🛡️
IEC/PAS 61076-3-122:2015 specifies rugged 8-way, shielded, free and fixed connectors. The document defines two mechanical types (TYP I and TYP II), with a fixed connector and a free connector for each type:
- Common features and typical connector pair: views of typical fixed and free connectors, mating information describing contact mating conditions and engagement/interlock behaviour;
- Dimensional characteristics for fixed connectors TYP I and TYP II and the matching free connectors, with pin and pair grouping assignment;
- Climatic category classification under the IEC 61076 framework;
- Electrical characteristics, including voltage proof (dielectric withstand) testing, insulation resistance, contact resistance, current rating, and shielding/transfer-impedance related requirements;
- Mechanical and environmental requirements appropriate to a “rugged” connector — vibration, shock, ingress protection, and coupling durability.
🚨 The “rugged” and “shielded” qualifiers are load-bearing: shielding is required for EMC performance in industrial and automotive data links, and ruggedness is required for vibration and shock environments. Do not substitute a non-shielded, standard-duty connector in an application that was designed against this detail specification.
4. Engineering and Procurement Practice 🛠️
- 🔍 Interface ownership: with a detail specification, the mechanical interface (dimensions, locking, gauging) and electrical ratings are fully defined; specify connector, mating connector and any accessories together as a pair to avoid interface mismatches.
- 🌡️ Climate and environment: select the connector using the climatic category and IP rating relevant to the installation, and verify temperature range, humidity, and washdown/exposure conditions.
- ⚡ Contact and shielding care: for power-capable contacts, verify current-carrying capacity including derating; for shielded connectors, verify shield continuity, transfer impedance, and termination (crimp or weld) quality for EMC.
- 📋 Qualification records: request test reports covering voltage proof, insulation resistance, contact resistance, mechanical durability, and environmental tests from the vendor; keep records for type approval and traceability.
5. Frequently Asked Questions ❓
❓ Q: What is the difference between a PAS and a full IEC standard?
A: A PAS (Publicly Available Specification) is a pre-standard published quickly to satisfy an urgent market need; it is reviewed within about three years and may be converted into an International Standard, amended, or withdrawn. Full standards have a complete consensus lifecycle.
A: A PAS (Publicly Available Specification) is a pre-standard published quickly to satisfy an urgent market need; it is reviewed within about three years and may be converted into an International Standard, amended, or withdrawn. Full standards have a complete consensus lifecycle.
❓ Q: Why are M8 connectors relevant for data and power applications?
A: M8 circular connectors provide a compact, screw-locked, sealed interconnection that fits space-constrained sensors and actuators while carrying both signal and power contacts, making them common in industrial field wiring and IO-Link devices.
A: M8 circular connectors provide a compact, screw-locked, sealed interconnection that fits space-constrained sensors and actuators while carrying both signal and power contacts, making them common in industrial field wiring and IO-Link devices.
❓ Q: Must I support both TYP I and TYP II in the rugged 8-way spec?
A: Not necessarily. The document defines fixed and free connector variants for each type; a manufacturer or project typically selects one type. The key is that mating components of the same type interlock correctly per the defined mating conditions.
A: Not necessarily. The document defines fixed and free connector variants for each type; a manufacturer or project typically selects one type. The key is that mating components of the same type interlock correctly per the defined mating conditions.
🔍 Q: How do I verify compliance of a connector to a PD IEC/PAS detail specification?
A: Use the dimensional gauging data, performance/climatic categories, and the electrical test requirements (voltage proof, insulation resistance, contact resistance) in the document as acceptance criteria, and request vendor test reports per those clauses.
A: Use the dimensional gauging data, performance/climatic categories, and the electrical test requirements (voltage proof, insulation resistance, contact resistance) in the document as acceptance criteria, and request vendor test reports per those clauses.
❓ Q: Does the PD (UK) adoption change the IEC technical content?
A: No. A Published Document reproduces the IEC/PAS text for UK implementation with a national foreword; technical content is unchanged. Always reference the current edition and check any national notes.
A: No. A Published Document reproduces the IEC/PAS text for UK implementation with a national foreword; technical content is unchanged. Always reference the current edition and check any national notes.