Phoenix 3211780 PT 4-TWIN-PE Protective Conductor Terminal Block, Push-in, 4 mm², Green-Yellow

The Phoenix 3211780 PT 4-TWIN-PE is a protective conductor terminal block engineered for reliable PE connections in industrial control panels and distribution systems. Its push-in connection technology allows fast, tool-free wiring of solid and stranded conductors up to 4 mm², while the green-yellow housing provides clear identification as a protective earth terminal. With three connection points and a compact single-level design, it accommodates multiple grounding conductors on a standard DIN rail, ensuring safe and efficient installation.

Advantages

Push-in terminations reduce wiring time by up to 50% compared to screw connections, and the maintenance-free spring clamp maintains constant contact pressure even under vibration. The terminal block supports a wide conductor range from 0.2 mm² to 6 mm² (solid) and 24 to 10 AWG, making it versatile for various grounding applications. Its PA insulating material meets UL 94 V0 flammability standards, and the operating temperature range from -60 °C to 105 °C suits harsh environments. The PE function integrates directly into the DIN rail, providing automatic earth contact without additional wiring.

Suitable for

• Grounding of control circuits in machine building and panel manufacturing
• Protective earth connections in automation systems and power distribution
• Use with DIN rails NS 35/7.5 and NS 35/15 in industrial enclosures
• Applications requiring high vibration resistance and maintenance-free connections
• Installations where fast, tool-free wiring of multiple PE conductors is needed

Key specifications

• Connection technology: Push-in
• Nominal cross section: 4 mm²
• Number of connections: 3
• Number of positions: 1
• Mounting type: DIN rail (NS 35/7.5, NS 35/15)
• Insulating material: PA (Polyamide), flammability UL 94 V0
• Stripping length: 10 mm
• Conductor cross section solid: 0.2 - 6 mm²
• Conductor cross section stranded: 0.2 - 4 mm²
• Conductor cross section AWG: 24 - 10
• Operating temperature: -60 °C to 105 °C
• Standards/approvals: IEC 60947-7-2, UL, CSA, EAC, VDE

Recommendations

For optimal performance, pair with Phoenix end covers and partition plates to ensure proper insulation and separation. Use ferrules on stranded conductors to prevent splaying and ensure secure push-in connections. Verify that the DIN rail is properly grounded to maintain the PE function of the terminal block.