Description
⚙️ Product Overview
The R. STAHL 8571/21-407-S-51 is a SolConeX explosion-protected wall-mounting socket designed for industrial electrical connections in hazardous environments. It is part of the R. STAHL 8571/21 series and provides a robust connection solution for equipment operating in areas where flammable gases or combustible dust may be present.
This model is configured as a 30 A, 480 V AC socket with a 3-pole, 4-conductor arrangement. The socket uses a mechanical interlocking system that helps prevent plug removal while under load. Its industrial enclosure is designed to provide protection against dust, water, mechanical impact, and demanding operating conditions.
🔧 Key Product Features
• Explosion-protected industrial wall-mounting socket
• SolConeX 8571/21 series design
• Rated for 30 A industrial applications
• Rated operational voltage of 480 V AC
• 3-pole, 4-conductor configuration
• 50/60 Hz operation
• Mechanical interlocking safety system
• Handle lockable in the 0 and I positions
• Designed to prevent plug removal under load
• Self-cleaning lamellar contacts
• Suitable for hazardous gas and dust environments
• High resistance to mechanical impact
📋 Product Datasheet
🔹 Brand: R. STAHL
🔹 Model: 8571/21-407-S-51
🔹 Series: SolConeX 8571/21
🔹 Product Name: Explosion-Protected Wall-Mounting Socket
🔹 Product Type: Industrial Electrical Socket
🔹 Rated Operational Current: 30 A
🔹 Rated Operational Voltage: 480 V AC
🔹 Frequency: 50/60 Hz
🔹 Pole Configuration: 3-Pole
🔹 Conductor Configuration: 4 Conductors
🔹 Nominal Motor Power: Up to 20 hp
🔹 Clock Position: 7 h
🔹 Colour Code: Red
🔹 Explosion Protection Application: Zones 1, 2, 21 and 22
🔹 Ingress Protection: IP66 for the applicable enclosure configuration
🔹 NEMA Enclosure Type: Type 3, 4 and 4X
🔹 Mechanical Interlock: Yes
🔹 Handle Position Locking: Lockable in 0 and I positions
🔹 Operating Temperature: Approximately -50°C to +65°C, depending on configuration
🔹 Mechanical Impact Resistance: High-impact industrial enclosure design
🔹 Mounting Method: Wall Mounting
🔹 Enclosure Material: Reinforced industrial-grade insulating material
🔹 Dimensions: Approximately 135 × 206 × 280 mm
🔹 Weight: Approximately 2 kg
🔹 Product Condition: New Surplus
🔹 Country of Origin: Germany, subject to production batch verification
⚠️ Important Note: The complete ordering code should always be checked before replacement. The exact socket configuration, cable entry arrangement, auxiliary contacts, explosion-protection approvals, voltage version, and installation requirements may vary according to the complete product code.
🏭 Typical Applications
The R. STAHL 8571/21-407-S-51 is suitable for industrial environments where electrical equipment must be connected safely within hazardous or explosion-risk areas.
Typical applications include:
• Oil and gas facilities
• Petrochemical plants
• Chemical processing systems
• Offshore platforms
• Refineries
• Paint and coating production areas
• Pharmaceutical production facilities
• Dust-sensitive industrial plants
• Mining-related industrial installations
• Industrial motor and pump connections
The socket can be used to provide a protected electrical connection for motors, pumps, portable equipment, maintenance equipment, and other compatible industrial loads.
🛡️ Safety and Mechanical Interlocking
A major feature of the SolConeX socket design is the mechanical interlocking system.
The plug is designed to be inserted and removed only under the correct operating conditions. The mechanical system helps prevent accidental disconnection while the electrical circuit is energized under load.
The operating handle can also be locked in the 0 or I position depending on the installation requirements. This provides additional control over equipment operation and helps improve workplace safety.
🔌 Connection Performance
The 3-pole, 4-conductor configuration is suitable for three-phase industrial power applications with a protective earth connection.
The socket is rated for 480 V AC and 30 A operation at 50/60 Hz. Its 20 hp nominal power rating makes it suitable for industrial motor and equipment connections within the rated electrical limits.
The self-cleaning lamellar contact design helps maintain reliable electrical contact during repeated connection and disconnection cycles.
🔍 Common Questions and Answers
❓ Q1: What is the main function of the 8571/21-407-S-51?
A: It is an explosion-protected wall-mounting industrial socket designed to provide a safe electrical connection for equipment installed in hazardous industrial environments.
❓ Q2: What voltage is this model designed for?
A: The 8571/21-407 configuration is designed for 480 V AC operation.
❓ Q3: What is the rated current?
A: The socket is rated for 30 A.
❓ Q4: How many poles does this model have?
A: This version uses a 3-pole, 4-conductor configuration.
❓ Q5: Can the plug be removed while under load?
A: The mechanical interlocking design is intended to prevent unsafe plug removal while the circuit is energized under load.
❓ Q6: What hazardous areas can the socket be used in?
A: Depending on the approved configuration and applicable installation standards, the series is designed for use in hazardous gas and dust areas including Zones 1, 2, 21 and 22.
❓ Q7: Is this socket suitable for motor connections?
A: Yes. With a nominal motor power rating of up to 20 hp at the specified electrical configuration, it can be used for compatible industrial motor and equipment connections.
❓ Q8: What should be checked before replacing an existing socket?
A: Verify the complete model number, voltage rating, current rating, pole configuration, clock position, cable entry type, hazardous-area classification, plug compatibility, and installation requirements.
🔧 Recommended R. STAHL Models
- R. STAHL 8571/21-405 – SolConeX 30 A Wall-Mounting Socket
- R. STAHL 8571/21-409 – SolConeX 30 A Wall-Mounting Socket
- R. STAHL 8571/21-505 – SolConeX 30 A Wall-Mounting Socket
- R. STAHL 8571/21-507 – SolConeX 30 A Wall-Mounting Socket
- R. STAHL 8571/21-509 – SolConeX 30 A Wall-Mounting Socket
- R. STAHL 8571/22 Series – SolConeX Industrial Plug
- R. STAHL 8571/51 Series – Explosion-Protected Maintenance Socket
- R. STAHL 8570 Series – Industrial Explosion-Protected Plug and Socket Equipment
- R. STAHL 7570/11 Series – Explosion-Protected Wall-Mounting Socket
- R. STAHL 8571 Series – SolConeX Hazardous-Area Connection Equipment
📦 Product Selection Reminder
When selecting a replacement for the R. STAHL 8571/21-407-S-51, the series number alone is not sufficient for confirming compatibility. The complete ordering code should be compared carefully.
Before installation, check the existing voltage, current rating, pole arrangement, clock position, plug type, hazardous-area classification, enclosure requirements, cable entry configuration, and local electrical installation standards.
For critical industrial applications, confirming the complete nameplate information before replacement can help prevent wiring errors, connection mismatches, and unnecessary equipment downtime.
