Phoenix UK3N Screw Terminal Block
The Phoenix Contact UK3N is a classic feed-through terminal block from the UK (Universal Klemme) series, which has been a standard in industrial wiring for decades. It features a screw-type connection system and accepts wire cross-sections up to 2.5 mm² (AWG 14). With a rated current of 24A and a rated voltage of 800V, it is suitable for signal wiring, 24V DC distribution, and low-power 230V AC circuits. The UK3N's compact width of 5.2 mm allows high packing density on DIN rails.
Technical Specifications
Product Type: Feed-through terminal block
Connection Method: Screw connection (M2.5 screw)
Rated Voltage: 800 V (IEC)
Rated Current: 24 A (at 40°C ambient)
Wire Cross-section (solid): 0.2 ... 2.5 mm² (AWG 24 ... 14)
Wire Cross-section (stranded with ferrule): 0.2 ... 1.5 mm²
Number of Connections: 2
Number of Levels: 1
Housing Material: Polyamide (PA), UL 94 V-2
Contact Material: Copper alloy, tin-plated
Width: 5.2 mm
Height: 42.5 mm
Depth: 47.7 mm
Mounting: NS 35/7.5 or NS 35/15 DIN rail
Operating Temperature: -40°C to +105°C
Certifications: CSA, UL, VDE, EAC, ATEX (Ex eb IIC Gb)
Design and Accessories
The UK3N terminal block features a fully enclosed housing with a captive screw clamp that prevents screw loss. The terminal accepts both solid and stranded wires with or without ferrules. The top surface has a marking groove for Phoenix Contact ZB 5 marking strips. The terminal can be bridged with standard UK 2.5 jumpers (FBS series) for potential distribution. End covers (D-UK2.5/4) and partition plates (ATP-UK) are available for isolation.
Application Domains
The UK3N is a general-purpose terminal block used in virtually every industrial control panel. It is suitable for connecting PLC I/O, sensor signals, power distribution for low-current loads, and building automation. Its proven design and wide availability make it a reliable choice for new installations and maintenance replacements.
Compatibility
The UK3N is compatible with legacy UK series accessories, ensuring that existing panels can be expanded or repaired with minimal change. The terminal block also accepts test plugs (TPS series) for circuit testing without removing wires.
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