R. STAHL Series 8570 16A Ex Plug and Socket

Overview

The R. STAHL Series 8570 is a 16A explosion-protected plug and socket system engineered for safe power connection and disconnection in classified hazardous areas. Built around R. STAHL’s SolConeX interlocking design, the Series 8570 combines a switched wall-mounting or flange socket with a matching plug so that the circuit is isolated before the connector can be withdrawn, preventing an arc from being drawn in a potentially explosive atmosphere.

With engineering support in Muscat, Seven Star LLC supplies the Series 8570 plug and socket range to oil and gas operators, EPC contractors, and electrical panel builders across Oman and the wider GCC. Every unit is fully ATEX and IECEx certified and supplied with manufacturer documentation and responsive local technical support for hazardous-area electrical infrastructure.

Operating Principle

The R. STAHL Series 8570 works on an interlocked switching principle: rotating the integral switch handle on the socket first breaks the electrical circuit internally before a mechanical interlock permits the plug to be withdrawn, and conversely the plug cannot be inserted and the switch turned on until it is fully seated and correctly aligned. This sequencing ensures that no live contact is ever exposed during connection or disconnection, which is the fundamental requirement for safely de-energizing portable and semi-portable equipment in a Zone 1/21 or Zone 2/22 classified area.

Floating contact pins within the plug allow for quick, low-friction insertion and removal while maintaining a reliable, low-resistance connection under the mechanical shock and vibration common on offshore platforms and process plant walkways. The practical consequence is a connector that can be operated repeatedly by maintenance and operations personnel without specialized tools, while still meeting the explosion-protection standards required for the installation zone.

Engineering Design of the R. STAHL Series 8570

The R. STAHL Series 8570 enclosure is molded from glass-fiber-reinforced polyamide, giving it high mechanical impact and shock resistance together with an IP66 ingress protection rating suitable for outdoor and washdown environments. The range covers wall-mounting sockets (8570/11), plugs (8570/12), flange sockets (8570/15 and 8570/25), and coupler sockets (8570/16), allowing a single explosion-protected connector family to cover fixed panel feed-throughs, portable equipment connection points, and inter-cable coupling requirements on the same site.

Each connector variant is coded by pole configuration (2P+E, 3P+E, 3P+N+E) and voltage range, with clock-hour keying on the plug and socket faces to prevent mismatched connections between different voltage or phase configurations installed on the same plant. Certification to ATEX and IECEx Zone 1/21 and Zone 2/22 standards is standard across the range, with variants available for 100–130V and 200–250V AC supply at 50/60Hz.

Key Features

The R. STAHL Series 8570 is built to give hazardous-area electrical installations a dependable, field-proven connection point:

• 16A rated plug and socket system for Zone 1/21 and Zone 2/22 explosion-protected areas.
• Interlocked switching ensures the circuit is de-energized before the connector can be withdrawn.
• IP66-rated glass-fiber-reinforced polyamide enclosure resists mechanical impact and washdown exposure.
• Floating contact pins allow quick, low-friction plug insertion and removal for frequent-use applications.
• Clock-hour keying between plug and socket prevents incorrect mating between different voltage or phase configurations.
• Available as wall-mounting sockets, plugs, flange sockets, and coupler sockets to cover fixed and portable connection needs.
• ATEX and IECEx certified for use across Zone 1/21 and Zone 2/22 classified hazardous areas.
• Voltage variants available from 100–130V through 200–250V AC at 50/60Hz.

Industrial Applications

The R. STAHL Series 8570 is installed throughout oil and gas production facilities, offshore platforms, and petrochemical plants wherever portable tools, lighting, or maintenance equipment need to be safely connected and disconnected within a classified hazardous area, including gas processing trains and tank farm perimeters in Oman’s upstream and midstream sector. In refineries and LNG terminals it provides interlocked power connection points for temporary maintenance equipment during turnarounds, while in marine and offshore support facilities it withstands the corrosive, high-humidity conditions typical of coastal GCC installations.

Backed by manufacturer datasheet documentation, Seven Star LLC distributes the Series 8570 to electrical contractors and EPC firms throughout Oman and the GCC, including hazardous-area electrical scopes in the Sohar and Salalah economic zones, where certified explosion-protected connectors are a mandatory part of the electrical safety case for any classified installation.

Technical Specifications

The table below summarizes the principal specifications of the R. STAHL Series 8570 plug and socket range as supplied by Seven Star LLC:

Beyond initial installation, the R. STAHL Series 8570 range is engineered for long-term serviceability: contact inserts and gaskets are field-replaceable, allowing a plant electrical team to refurbish a worn connector rather than replace the entire unit, which reduces both spare-parts cost and hazardous-area work permit frequency over the equipment lifecycle. Seven Star LLC supplies the full pole and voltage variant matrix on request so that a matching plug or socket can be quoted against an existing installation without requiring a full system re-specification.

Request a Quote for R. STAHL Series 8570

Electrical contractors, EPC firms, and procurement teams across Oman and the GCC can request a formal quotation for the R. STAHL Series 8570 plug and socket range directly from Seven Star LLC’s hazardous-area electrical division, with technical datasheets available to support site electrification schedules. Working closely with plant engineers in the region, Seven Star LLC supports every Series 8570 connector supplied with manufacturer documentation and responsive local technical support.

Browse the full R. STAHL range or see more Power Modules products supplied by Seven Star LLC in Oman and the GCC.

See also: R. STAHL 9160/13-11-11s Transmitter Supply Unit.