Phoenix Contact PTTBS-1,5/SWH/U-BK/O-RD Double-Level KNX Terminal Block Black/Red

Rated for 500 V and 17.5 A with a 6 kV surge voltage rating, this double-level terminal block delivers robust performance for KNX bus systems. The push-in connection technology allows tool-free wiring of solid and stranded conductors from 0.14 mm² to 1.5 mm² (AWG 26–16), ensuring fast, secure installation.

Overview

The Phoenix Contact PTTBS-1,5/SWH/U-BK/O-RD is a two-level terminal block specifically engineered for KNX applications. It features four push-in connection points (two per level) with a nominal cross section of 1.5 mm². The upper level is black and the lower level is red, providing clear visual identification for bus polarity. The block mounts on standard DIN rails (NS 35/7,5 or NS 35/15) and is constructed from flame-retardant polyamide (UL 94 V0).

What stands out

• Double-level design saves space on the DIN rail while offering four connections
• Push-in terminals enable tool-free wiring with a stripping length of 8–10 mm
• Color-coded levels (black/red) simplify KNX bus polarity identification
• Wide operating temperature range from -60 °C to 105 °C
• High surge voltage rating of 6 kV and pollution degree 3 for demanding environments

Technical details

• Product type: Double-level terminal block
• Application: KNX bus systems
• Connection technology: Push-in
• Nominal voltage: 500 V
• Nominal current: 17.5 A
• Nominal cross section: 1.5 mm²
• Wire cross section (solid/stranded): 0.14–1.5 mm²
• AWG range: 26–16
• Number of levels: 2
• Number of connections: 4
• Color: Black (upper level), Red (lower level)
• 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
• Rated surge voltage: 6 kV
• Pollution degree: 3

Our verdict

With its compact double-level design, color-coded levels, and reliable push-in connections, this Phoenix Contact terminal block is an excellent choice for KNX installations where space and clarity matter.