8571/21-407-S-51 Stahl SolConeX Plug and Socket

Product Description (Detailed Explanation)

The SolConeX 8571 series is a specialized plug-and-socket system featuring a “Switch-Disconnect” integrated mechanism. This particular model (21-407) is a 5-pole (3P + N + PE) version, providing a complete solution for three-phase power applications.

• Mechanical Interlock: The most critical feature is the integrated load-break switch. The plug can only be inserted or removed when the switch is in the “OFF” position, and the switch can only be turned to “ON” once the plug is fully engaged. This prevents the creation of electric arcs during connection/disconnection.

• Enclosure: Made from glass fiber reinforced polyester resin, which offers extreme durability and resistance to chemicals and UV radiation.

• Safety Rating: It carries Ex de protection, meaning the connection chamber is flameproof while the terminal compartment provides increased safety.

Product Parameters (Technical Specifications)

Product Advantages (Key Benefits)

• High Operational Safety: The integrated AC-3 motor switching capacity allows the socket to safely disconnect motor loads under full operation.

• Extreme Durability: The IP66 rating ensures the unit is completely dust-tight and protected against powerful water jets, making it suitable for outdoor or marine use.

• Self-Cleaning Contacts: The socket features lamellar contacts that are self-cleaning and provide low contact resistance, reducing heat buildup and extending service life.

• Large Wiring Space: The terminal compartment is designed with ample space to facilitate easy and fast installation of heavy-gauge cables.

• Padlockable: The rotary switch handle can be locked in the “OFF” position with a padlock to prevent unauthorized use during maintenance (LOTO).

Precautions (Important Notes)

• Matching Plug: This socket must be used with a compatible R. STAHL 8571/12 series plug. Standard industrial plugs (non-explosion proof) will not fit and cannot be used safely.

• Installation Environment: Ensure that the cable glands used for entry maintain the IP66 and Ex-protection rating. Use only certified explosion-proof glands.

• Orientation: For wall mounting, ensure the socket is installed with the opening facing downwards or at the specified angle to prevent water accumulation within the protective cap.

• Maintenance: Periodically check the seal of the protective cover. If the cover is left open while no plug is inserted, the IP rating is compromised, and the interior may be exposed to corrosive elements.

Product Applications (Typical Use Cases)

The 8571/21-407-S-51 is a staple in industries where flammable substances are processed:

• Oil & Gas Platforms: Providing power for mobile welding units or portable ventilation fans on offshore rigs.

• Chemical & Petrochemical Plants: Powering mobile mixers, pumps, and centrifuges in Zone 1 and Zone 2 environments.

• Pharmaceutical Manufacturing: Used in clean rooms or processing areas where volatile solvents are handled.

• Marine & Shipbuilding: Supplying power on deck where exposure to salt spray and explosive vapors (from fuel/cargo) is a constant risk.

• Paint & Coating Facilities: Safe power connection in spray booths or mixing rooms.