Phoenix Contact PTTBS 1,5/SWH/U-YE/O-WH Double-Level KNX Terminal Block, Push-in, White/Yellow

Electricians and panel builders wiring KNX bus systems in building automation projects often need a compact, reliable connection point for data and power lines. The Phoenix Contact PTTBS 1,5/SWH/U-YE/O-WH double-level terminal block answers that need with its space-saving design and push-in technology, making it a practical choice for crowded control cabinets and distribution boards.

Key specifications

• Type: Double-level terminal block for KNX applications
• Connection technology: Push-in (tool-free wiring)
• Number of connections: 4 (2 per level)
• Number of potentials: 2
• Nominal cross section: 1.5 mm² (solid conductors 0.14–1.5 mm²)
• Nominal voltage (IEC): 500 V
• Nominal current (IEC): 17.5 A
• Rated surge voltage: 6 kV
• Mounting: DIN rail NS 35/7.5 or NS 35/15
• Insulating material: Polyamide (PA), flammability rating UL 94 V0
• Operating temperature: -60 °C to +105 °C
• Stripping length: 8–10 mm
• Pollution degree: 3, overvoltage category III
• Colour: White with yellow lever (colour-coded for KNX)

Why choose it

This terminal block combines two levels in one compact housing, halving the rail space needed compared to single-level blocks. The push-in connection allows solid conductors to be inserted without tools, speeding up installation and reducing fatigue on large projects. The white and yellow colour scheme matches KNX wiring conventions, helping to prevent wiring errors. Built from flame-retardant polyamide, it withstands harsh industrial environments and meets stringent safety standards.

Ideal use cases

• KNX bus line distribution in building automation panels
• Connecting sensors, actuators, and bus couplers in smart buildings
• Space-constrained control cabinets where double-level density is needed
• Retrofit projects requiring reliable, maintenance-free terminations

Good to know

The PTTBS 1,5/SWH/U-YE/O-WH is part of Phoenix Contact's comprehensive terminal block range, ensuring compatibility with standard accessories such as end brackets, partition plates, and marking systems. Its wide operating temperature range makes it suitable for both indoor and outdoor installations, from cold storage facilities to machine rooms. For stranded wires, ferrules are recommended to achieve the full rated cross section.