Weidmüller WDU 4 Screw Feed-Through Terminal Block

The Weidmüller WDU 4 is a 4 mm² rated screw-clamp feed-through terminal block built to IEC 60947-7-1, covering conductor sizes from 0.5 mm² to 6 mm² and rated for 32 A continuous current at 500 V AC. It occupies the critical mid-range between instrument-grade 2.5 mm² terminals and the heavy power terminals used in motor starter and bus bar sections, making it the preferred wiring point for 240 V AC motor auxiliary circuits, solenoid valve coil connections, and higher-current instrument-loop power supplies in Saudi industrial switchgear assemblies. The wider clamp aperture and 6 mm pitch (compared to the WDU 2.5's 5 mm pitch) provides the additional wire-bend radius required for heavier 4 mm² and 6 mm² control cables when running in dense Saudi panel wiring harnesses where space management is critical.

The WDU 4 uses the same screwless screw-clamp contact body as the WDU 2.5, ensuring consistent actuation torque and clamping force across the terminal strip. The clamping system is rated for IP2X finger-safe operation when the wire is absent, complying with IEC 61439 and ARAMCO GI-0036 requirements for accessible live parts in panels rated above 50 V. The terminal block is designed to accept both standard ring-lug lugs and bare stranded conductors, which is important in Saudi panel fabrication where local wiring contractors may use either termination style depending on project specification. The symmetrical design allows bidirectional cable entry from either the front or the rear of the 35 mm DIN rail, simplifying the wiring routes in high-density panels.

The WDU 4 is the standard 4 mm² interface terminal in Weidmüller Klippon series and is used extensively in ARAMCO EPC instrument panels for 240 V AC solenoid valve drive circuits, redundant thermocouple loops with 6 mm² extension cable, and 230 V AC power supply outputs feeding distributed I/O marshalling sections. SABIC's operating companies in Jubail — including Arabian Petrochemical Company (Petrokemya), Saudi Yanbu Petrochemical Company (Yanpet), and Saudi Kayan Petrochemical Company — use WDU 4 terminals in their DCS and ESD panel expansions alongside WDU 2.5 instrument terminals. The NEOM OXAGON industrial port power distribution panels and the NEOM Bay Airport traction power sub-panels specify 4 mm² Klippon terminals as the standard auxiliary control-circuit interface, a specification that Razz Middle East supplies from standing Jeddah stock.

Razz Middle East supplies the WDU 4 across the Kingdom from Riyadh and Jeddah distribution hubs with 24–48 hour delivery to site. Our panel engineering team provides complete Klippon terminal strip assembly services — including WDU 4 strips pre-mounted on punched DIN rail sections with end plates, bridge connectors, and Weidmüller M-series marker cards laser-etched per project cable schedule — reducing panel-shop wiring time by up to 40% on large marshalling cabinets. All WDU 4 supplies are accompanied by CE declarations, IEC 60947-7-1 test certificates, and SASO import conformity documentation. For projects requiring ATEX Ex e zone 1 rated 4 mm² terminals, Razz Middle East stocks the WEW 4/U variant rated to IEC 60079-7 for ARAMCO wellhead and hazardous-area junction boxes.