Technical Specifications

Product Introduction

The Eaton CEX133-D-28-339PN is a premium rugged multi-pin plug in Eaton’s Roughneck / Crouse-Hinds connector family, engineered for extreme environments and hazardous — classified zones. As a flameproof (Ex d) cable-mounted plug, CEX133-D-28-339PN delivers secure, high-current connections while maintaining full explosion protection and ingress resistance. It supports 30 A circuits via robust #12 AWG crimp contacts and is designed for seamless integration into industrial power and control systems in demanding contexts.

In industrial control systems, CEX133-D-28-339PN serves as a critical interface between fixed wiring and mobile cables or equipment in hazardous areas. Its durable shell and gland design ensure that the internal connection remains safe under mechanical stress, moisture, dust, or corrosive atmospheres. Because this plug conforms to IECEx / ATEX Zone 1 rated standards, CEX133-D-28-339PN is ideal for installations in petrochemical plants, offshore platforms, mining operations, chemical processing, and other environments where spark-free, explosion-proof connectivity is mandatory.

Eaton’s Roughneck series positions CEX133-D-28-339PN as part of a modular ecosystem of connectors, enabling system designers to mix plugs, receptacles, backshells, and adaptors while maintaining form, sealing, and protection consistency. CEX133-D-28-339PN is engineered for field installation: it supports sizable cable diameters, uses crimp contacts for reliable connectivity, and provides a flameproof cable gland that retains integrity under pressure and fault conditions.

Core Advantages and Technical Highlights

Reliable Explosion Protection: The CEX133-D-28-339PN plug is built to the Ex d standard, ensuring any internal arcs or faults are contained, safeguarding the external atmosphere. This feature is critical for hazardous area compliance and safety.

High Current Capacity: With a 30 A rating and robust #12 AWG silver-plated copper crimp contacts, CEX133-D-28-339PN can reliably carry higher loads without overheating, making it suitable for power, control, or heavy instrumentation circuits.

Wide Cable Accommodation: The cable gland supports inner sheaths from 29 to 41 mm and outer sheaths from 35 to 48 mm, allowing compatibility with larger power or instrumentation cables. This flexibility reduces the need for intermediate adaptors.

Robust Sealing & Ingress Protection: CEX133-D-28-339PN offers IP68 and IP66 ingress protection, meaning it resists dust ingress and water immersion. This makes it ideal in harsh environments subject to washdown, humidity, or outdoor exposure.

Modular and System-Compatible: As part of Eaton’s Roughneck connector family, CEX133-D-28-339PN fits into a modular system where mating receptacles, backshells, and adaptors can be selected to match site needs. This modularity simplifies inventory and field compatibility.

Durable Construction: The shell housing is made from high-strength materials (typically corrosion-resistant aluminum or alloy) and is designed to withstand mechanical shock, vibration, and thermal cycling — key in industrial settings.

Ease of Installation and Maintenance: The design supports field assembly, with accessible crimp contacts and gland tightening. Maintenance or replacement is straightforward without requiring complex disassembly of the entire system.

Outstanding Impregnable Seals: The flameproof gland and sealing surfaces are engineered to maintain integrity under fault stress or external damage, preserving operational safety of CEX133-D-28-339PN even under harsh conditions.

Typical Application Scenarios

The CEX133-D-28-339PN plug is widely adopted in industrial automation, process control, and power distribution in classified or hazardous environments. In petrochemical or chemical plants, CEX133-D-28-339PN is used to connect rotating equipment, sensors, actuators, or instruments located in Zone 1 areas to junction panels or control systems, ensuring explosion-safe continuity.

On offshore oil platforms or LNG facilities, where safety certifications are stringent, CEX133-D-28-339PN provides robust cable terminations for pumps, valves, motor skids or instrumentation strings running between safe and hazardous zones. The plug’s sealing and flameproof nature are crucial in salt spray, humidity, and vibration conditions.

In mining, coal, or fuel-handling installations, CEX133-D-28-339PN connects control cables across dusty, damp, or explosive environments, preserving signal integrity and operator safety. In processing plants handling vapors, solvents, or combustible gases, CEX133-D-28-339PN ensures that cable interfaces do not become ignition points.

For industrial machinery or modular skid systems deployed in classified areas, CEX133-D-28-339PN enables safe, field-replaceable connections for power or control modules. Because it is part of a modular connector platform, CEX133-D-28-339PN allows flexible system reconfiguration without compromising safety.

Related Model Recommendations

• CEX133-D-28-339SN: Similar plug variant but with socket (female) contact arrangement for complementary connections.

• CEX133-C-28-339PN: A “C” (cable) version with different shell or gland configuration while retaining 30 A rating.

• CEX133-D-28-339PF: A version with special finishing or corrosion-resistant plating for marine environments.

• CEX153-D-28-376PN: Higher shell size (376 series) for greater contact count or power circuits, in the same Roughneck platform.

• CEX133-D-28-339RP: Right-angle or panel plug in the same contact family, useful when space is constrained.

• CEX133-D-28-339PF: Version suited for harsh marine or salty atmospheres with protective plating.

These alternatives preserve compatibility in form, mounting interface, or sealing philosophy yet enable variant configurations for mating, orientation, environment, or higher current demands.

Installation, Commissioning and Maintenance Instructions

Installation preparation: Before installing CEX133-D-28-339PN, verify that the cable diameter fits within the gland’s allowable range (inner sheath 29–41 mm, outer 35–48 mm) and that the cable insulation and shielding are stripped correctly. Ensure the environment is safe, de-energized, and ESD precautions are followed. Inspect the connector shell, threads, and sealing surfaces for any damage or contamination. Use only Eaton-approved crimp contacts and tools to ensure reliability.

Commissioning: Insert and crimp each contact carefully, verifying correct pin assignment and secure mechanical connection. Tighten the flameproof cable gland to the torque specified in Eaton’s documentation to ensure a certified seal. Mate the plug to its corresponding receptacle, ensuring proper alignment and locking. After connection, perform continuity, insulation resistance, and high-pot testing (if required) across the plug assembly to confirm no leakage or faults. Monitor for heating under load during initial operation.

Maintenance suggestions: Periodically inspect CEX133-D-28-339PN for signs of corrosion, abrasion, or loose connections. Verify the gland seal remains tight and re-torque if necessary. Clean the exterior shell surfaces and ensure no ingress of dust or water. Inspect crimp contacts for signs of oxidation, discoloration, or looseness; replace contacts if degraded. If the plug is unmated, cover the interface with protective caps to prevent contamination. Always keep a spare CEX133-D-28-339PN or mating connector in inventory to allow quick replacement in failure conditions and minimize downtime.

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