Phoenix Contact HDFK4 High-Current Terminal Block

The Phoenix Contact HDFK4 is a high-current feed-through terminal block designed for demanding industrial power distribution applications. With a rated current of 76A and rated voltage of 1000V, it provides a reliable, low-resistance connection for solid and stranded copper wires. The terminal block features a screw-type connection system that ensures gas-tight, maintenance-free connections even under high vibration conditions.

Construction and Design

The HDFK4 terminal block features a compact, space-saving design with a width of only 8.2 mm, allowing high packing density on DIN rails. The housing is made of high-grade polyamide with UL 94 V-0 self-extinguishing rating, ensuring safety in case of electrical fault. The screw connection uses a hardened steel clamp with a nickel-plated contact surface, providing reliable wire retention without cold flow deformation. The terminal block is compatible with Phoenix Contact's standard bridging, marking, and testing accessories.

Application Domains

The HDFK4 is ideal for power distribution in industrial control cabinets, switchgear, and power supply units. It is commonly used for connecting heavy loads such as motor feeders, heating elements, and main power entry points. Its high current and voltage rating also make it suitable for renewable energy applications, including solar combiner boxes and wind turbine control panels.

Installation and Accessories

Installation is straightforward using standard NS 35 DIN rail (7.5 mm or 15 mm depth). The terminal block accepts both solid and stranded wires without requiring special tools (a standard screwdriver is sufficient). Phoenix Contact offers matching jumpers (FBS series) for potential distribution, end covers (D-HDFK4), marking strips (ZB series), and test plugs (TPS series) for easy circuit testing without disconnecting wires.