Phoenix Contact PTFIX 1,5-KNX-NS35AD Distribution Block, Push-in, 1.5 mm², 6 Connections, Green/Black

In KNX bus installations, reliable distribution of the bus signal to multiple lines is critical, yet traditional screw terminals are time-consuming and prone to loosening. The Phoenix Contact PTFIX 1,5-KNX-NS35AD distribution block solves this with push-in technology, allowing tool-free wiring of solid or stranded conductors. Its compact design mounts directly onto a 35 mm DIN rail, providing a central point to distribute the KNX bus to up to five outgoing lines from a single incoming feed. The green/black housing clearly identifies the KNX bus polarity, reducing installation errors.

Who is it for

This distribution block is intended for electrical installers, panel builders, and system integrators working with KNX building automation systems. It is suitable for use in distribution boards, control cabinets, and anywhere a reliable, maintenance-free connection for KNX bus lines is required. Whether you are commissioning a new smart building or retrofitting an existing installation, this block streamlines wiring and ensures long-term stability.

Main features

• Push-in connection technology for fast, tool-free wiring of solid conductors and conductors with ferrules.
• Six connection points: one input and five outputs for KNX bus distribution.
• Nominal cross section of 1.5 mm², accepting conductors from 0.14 mm² to 1.5 mm² (solid or flexible).
• Mounts on standard 35 mm DIN rail (NS 35) for quick integration into enclosures.
• Rated voltage 500 V and rated current 17.5 A (IEC), suitable for KNX SELV circuits.
• Colour-coded green and black terminals for clear polarity identification.
• Housing made of polyamide (PA) with UL 94 V0 flammability rating for enhanced fire safety.
• Wide operating temperature range from -35 °C to +105 °C, suitable for demanding environments.
• Pollution degree 3 and overvoltage category III for robust performance.

Specifications

• Brand: Phoenix Contact
• Model: PTFIX 1,5-KNX-NS35AD
• MPN: 1187193
• EAN: 4063151230234
• Product type: Distribution block
• Application: KNX bus systems
• Connection technology: Push-in
• Number of connections: 6 (1 input, 5 outputs)
• Number of potentials: 1
• Nominal cross section: 1.5 mm²
• Conductor cross section solid: 0.14 mm² - 1.5 mm²
• Conductor cross section flexible: 0.14 mm² - 1.5 mm²
• Stripping length: 8 mm - 10 mm
• Rated voltage (IEC): 500 V
• Rated current (IEC): 17.5 A
• Mounting type: DIN rail NS 35
• Colour: Green / Black
• Insulation material: PA (Polyamide)
• Flammability rating: UL 94 V0
• Operating temperature: -35 °C to +105 °C
• Pollution degree: 3
• Overvoltage category: III

Tips

For reliable push-in connections, use conductors with ferrules or solid wires within the specified cross-section range. Ensure the DIN rail is properly grounded if required by local regulations. When distributing the KNX bus, keep the total bus length within KNX topology limits and use appropriate KNX power supplies. The green and black terminals correspond to the standard KNX bus polarity: red (+) and black (-) are often used, but always verify with the system documentation.