Weidmuller WDU 16 Feed-Through Terminal Block

Technical Overview

The Weidmüller WDU 16 is a robust, single-tier feed-through terminal block designed for high-reliability electrical connections in industrial environments. Featuring a proven screw connection system with a clamping yoke, it accommodates wire cross-sections up to 16 mm² (AWG 6). The unit is constructed from Wemid, a high-performance thermoplastic with a UL 94 V-0 flammability rating, ensuring operation across a wide temperature range of -60 °C to +130 °C. It supports a rated voltage of 1000 V and a rated current of 76 A (IEC), making it suitable for demanding power distribution and automation tasks. The terminal block is ATEX and IECEx certified for use in hazardous areas.

Key Features

Screw connection technology with clamping yoke for gas-tight, vibration-proof connections
Wemid insulation material offers superior thermal stability (-60°C to +130°C) compared to standard PA66
Rated for 1000 V AC/DC and 76 A nominal current (IEC)
Compact design with a width of 11.9 mm saves rail space
Certified for hazardous locations (ATEX/IECEx) with Ex e II marking
Accommodates a wide range of conductor types including solid, stranded, and flexible with ferrules
Halogen-free and UL 94 V-0 flammability rated for enhanced safety

Technical Specification Matrix

Technical Parameter	Specification
Width (inches)	0.469 inch
Height (inches)	2.362 inch
Depth (inches)	2.461 inch
Depth including DIN rail	63 mm
Material	Wemid
Color	Dark beige
UL 94 flammability rating	V-0
Continuous operating temp., min.	-60 °C
Continuous operating temp., max.	130 °C
Storage temperature	-25 °C...55 °C
Rated cross-section	16 mm²
Rated voltage	1000 V
Rated current	76 A
Current at maximum wires	101 A
Volume resistance	0.42 mΩ
Rated impulse withstand voltage	8 kV
Power loss in accordance with IEC 60947-7-x	2.43 W
Pollution severity	3
Connection type	Screw connection
Stripping length	16 mm
Tightening torque, min.	3.0 Nm
Tightening torque, max.	4.0 Nm
Clamping range, min.	1.5 mm²
Clamping range, max.	25 mm²
Wire connection cross section, solid, min.	1.5 mm²
Wire connection cross section, solid, max.	16 mm²
Wire connection cross section, stranded, min.	1.5 mm²
Wire connection cross section, stranded, max.	25 mm²
Wire connection cross section, finely stranded, min.	1.5 mm²
Wire connection cross section, finely stranded, max.	25 mm²
Wire connection cross-section, finely stranded with wire-end ferrules DIN 46228/1, min.	1.5 mm²
Wire connection cross-section, finely stranded with wire-end ferrules DIN 46228/1, max.	16 mm²
Wire connection cross-section, finely stranded with wire-end ferrules DIN 46228/4, min.	1.5 mm²
Wire connection cross-section, finely stranded with wire-end ferrules DIN 46228/4, max.	16 mm²
Twin wire-end ferrules, min.	1.5 mm²
Twin wire-end ferrules, max.	10 mm²
Gauge to IEC 60947-1	B7
Number of connections	2
Number of levels	1
Number of clamping points per level	2
Mounting rail	TS 35
End cover plate required	Yes
Voltage (CSA)	600 V
Current (CSA)	85 A
Wire cross section min. (CSA)	18 AWG
Wire cross section max. (CSA)	6 AWG
Voltage (UL)	600 V
Current (UL)	85 A
Wire cross section min. (UL)	18 AWG
Wire cross section max. (UL)	4 AWG
Certificate No. (ATEX)	KEMA98ATEX1683U
Certificate No. (IECEx)	IECEXULD14.0005U
Max. voltage (ATEX)	690 V
Current (ATEX)	76 A
Wire cross section max. (ATEX)	16 mm²
Marking EN 60079-7	Ex eb II C Gb
Marking ATEX Directive 94/9/EC	II 2 G D
Width	11.9 mm
Height	60 mm
Depth	62.5 mm
Blade size	1.0 x 5.5 mm
Net weight	29.46 g

Industrial Applications

1. Heavy-Duty Industrial Power Distribution

Serves as a primary power feed-in interface for large-scale industrial control panels and distribution boards.

Problem Solved

Securely terminates large gauge conductors (up to 25 mm² stranded) carrying high currents, minimizing voltage drop and heat generation in high-density cabinets.

Power feed-inHigh current terminationLow contact resistanceThermal stability

2. Hazardous Area Process Control

Deployed in ATEX/IECEx certified explosion-proof enclosures for petrochemical, mining, and gas processing facilities.

Problem Solved

Ensures compliant and safe electrical connectivity in volatile atmospheres via Ex eb II C Gb certification, preventing sparking or overheating.

ATEX certifiedIECEx compliantExplosion proofEx eb II C Gb

3. Vibration-Resistant Machinery Wiring

Connects power supplies to heavy motors, drives, and actuators in manufacturing equipment subject to mechanical stress.

Problem Solved

The screw connection with patented clamping yoke technology maintains contact integrity and prevents loosening under constant operational vibration.

Vibration resistanceScrew connectionClamping yokeMotor wiring