Terminal ferrules Rittal AS 4051.685, copper/PP, 0.75 mm² conductor, 12 mm length, grey, pack 500

Rittal AS 4051.685 insulated terminal ferrules are designed for reliable termination of stranded conductors with a cross-section of 0.75 mm². Each ferrule combines a copper tube for electrical conductivity with a polypropylene (PP) insulated collar in grey. The ferrules are 12 mm in overall length with an outer diameter of approximately 3.4 mm and are supplied in a pack of 500, intended for use in control cabinets, switchgear and industrial electrical installations where secure, repeatable wire connections are required.

Advantages

The copper inner tube ensures low contact resistance and stable electrical performance. The polypropylene insulation provides mechanical strain relief, insulation between adjacent conductors and color identification. The standardized length and consistent crimp geometry enable secure crimped joints and improved conductor insertion, reducing stray strands and improving long-term connection reliability. The pack quantity of 500 supports larger wiring projects and maintenance tasks.

Suitable for

• Termination of stranded conductors with 0.75 mm² cross-section
• Control cabinet wiring and switchgear assemblies
• Industrial machines and automation panels
• Mass wiring and maintenance where uniform ferrules speed installation

When it may not be suitable

These ferrules are specified for 0.75 mm² conductors; they are not suitable for significantly larger or smaller conductor cross-sections. They are intended for stranded copper conductors and are not appropriate for solid conductors or for applications requiring special high-temperature or chemically resistant insulation materials.

Key specifications

• Conductor cross-section: 0.75 mm²
• Ferrule length: 12 mm
• Outer diameter: approx. 3.4 mm
• Inner tube material: copper
• Insulation material: polypropylene (PP), grey
• Pack quantity: 500 pieces

How to use

Trim the stranded conductor to the required length and, if necessary, twist the strands lightly. Insert the stripped conductor into the copper tube until the insulation collar butts against the wire insulation. Use an appropriate insulated ferrule crimping tool sized for 0.75 mm² ferrules and apply a controlled crimp to compress the copper tube onto the conductor. After crimping, inspect the joint to ensure there are no loose strands and that the ferrule is seated squarely. The insulated collar provides a visual and mechanical stop and helps guide the ferrule during insertion into terminal blocks.

What to consider before purchase

• Confirm conductor type and cross-section (0.75 mm² stranded copper recommended)
• Ensure crimping tool compatibility with 0.75 mm² insulated ferrules
• Verify required ferrule length and outer diameter for your terminal blocks
• Consider pack size (500) relative to project needs and storage

Usage recommendations

Use a high-quality crimping tool matched to insulated ferrules to achieve consistent compression and low contact resistance. Maintain proper stripping length so the copper tube fully encloses the conductor strands and the insulation collar prevents wire strand splaying. For reliable panel wiring, keep ferrule sizes consistent with terminal block clamp dimensions and follow applicable electrical installation standards.