Technical Overview

The Weidmüller ZB 4 (Part No. 0316500000) is a high-durability clamping yoke specifically engineered for secure conductor connections to busbars in industrial and hazardous environments. Manufactured from high-quality steel with a passivated silver finish, this component offers a feed-through bushing installation style that ensures robust mechanical retention and electrical continuity. It features a broad clamping range supporting wire cross-sections up to 4 mm² (stranded) and 6 mm² (solid). The ZB 4 is fully ATEX and IECEx certified (Ex eb II C Gb), making it an essential component for potential equalization and grounding in explosive atmospheres involving flammable gases or dust. Its design allows for flexible positioning along the busbar without the need for drilling, facilitating easy retrofits and adjustments in control cabinets and distribution systems.

Key Features

Flexible positioning on busbar allowing precise adjustment of wiring layout
Certified for use in hazardous areas (ATEX: DEMKO03ATEX136028U, IECEx: ULD13.0005U)
Robust steel construction with galvanized/passivated surface for corrosion resistance
Supports wire cross-sections from 0.5 mm² up to 6 mm² (solid) or 4 mm² (stranded)
Non-destructive installation eliminates need for drilling busbars
Feed-through bushing design ensures high mechanical stability

Technical Specification Matrix

Technical Parameter	Specification
Product Name	ZB 4
Order Number	0316500000
Type of Connection	Clamping yoke / Busbar connection
Material	Steel
Surface Finish	Galvanized, passivated
Installation Advice	Feed-through (bushing)
Wire Connection Cross Section (Solid, Max)	6 mm²
Wire Connection Cross Section (Stranded, Max)	4 mm²
Clamping Range (Min)	0.5 mm²
Clamping Range (Max)	6 mm²
Stripping Length	16 mm
Tightening Torque	0.5...1.0 Nm
ATEX Certificate	DEMKO03ATEX136028U
IECEx Certificate	IECEXULD13.0005U
Marking	Ex eb II C Gb
Operating Temperature Range	-50 °C...120 °C
Insulating Material	None (Metallic component)
Screw Size	M 3
Width	6 mm
Net Weight	3.48 g

Industrial Applications

1. Hazardous Area Potential Equalization

Establishment of secure, explosion-proof grounding connections on busbars within Zone 1 and 2 environments, utilizing the ZB 4's ATEX-certified clamping mechanism.

Problem Solved

Mitigates the risk of sparking and static discharge in explosive atmospheres by providing a certified, vibration-resistant ground path compliant with EN 60079-7.

ATEX certificationEx eb II C GbPotential equalizationHazardous locationSpark prevention

2. Flexible Control Cabinet Retrofitting

Dynamic addition of neutral or protective earth tap-off points on existing busbar runs without modifying the underlying copper bar structure.

Problem Solved

Eliminates the downtime and structural integrity issues associated with drilling new holes in busbars, allowing for sliding adjustment and non-destructive expansion.

Busbar retrofitSliding clampNon-invasive connectionTension yokeDistribution expansion

3. Vibration-Resistant Machinery Grounding

Securing protective earth conductors to machine chassis busbars in high-vibration heavy industry applications using the steel tension yoke system.

Problem Solved

Prevents the loosening of critical safety ground connections caused by mechanical resonance, ensuring continuous electrical safety without specialized crimping tools.

Vibration dampingProtective earthSteel clamping yokeMechanical retentionM3 screw tension

Weidmuller ZB 4 Clamping Yoke for Busbar

Weidmüller ZB 4 Clamping Yoke for Busbar

Technical Overview

Key Features

Technical Specification Matrix

Industrial Applications

1. Hazardous Area Potential Equalization

2. Flexible Control Cabinet Retrofitting

3. Vibration-Resistant Machinery Grounding