Rittal AS 4051.686 insulated ferrules, copper conductor, polypropylene sleeve, 1.0 mm² — 10 mm length, 3.5 mm diameter, pack of 500

Rittal AS 4051.686 insulated ferrules are designed for reliable termination of 1.0 mm² copper conductors in electrical panels, control cabinets and machinery. Each ferrule combines a copper crimp tube with a red polypropylene (PP) insulating sleeve, offering consistent electrical contact and mechanical protection. The ferrules measure 10 mm in length with an outer diameter of 3.5 mm and are supplied in a pack of 500 for bulk wiring tasks.

Advantages

These insulated ferrules provide a uniform crimp on stranded copper conductors, reducing the risk of stray wires and improving connection reliability. The copper tube ensures low-resistance contact while the polypropylene sleeve insulates and protects against short circuits and corrosion at the termination point. Supplied in a large pack, they support efficient, repeatable wiring operations and help maintain neat, professional-looking connections in confined terminal blocks.

Suitable for (tasks / use cases)

• Terminating 1.0 mm² stranded copper conductors in control cabinets and distribution panels
• Field and factory wiring of terminal blocks, relays and disconnects
• Applications requiring insulated terminations to prevent conductor fraying and accidental shorts
• Batch electrical assembly and maintenance where consistent crimp quality is needed

When it may not be suitable

The ferrules are sized specifically for 1.0 mm² conductors; they are not suitable for significantly larger or smaller conductor cross-sections. They are intended for copper conductors and should not be used with aluminium conductors unless suitable transition methods are applied. For environments requiring high-temperature, chemically resistant or vibration-damped insulation materials, alternative ferrules with specialized sleeves should be considered.

Key specifications

• Conductor cross-section: 1.0 mm²
• Material of crimp tube: copper
• Insulation sleeve material: polypropylene (PP)
• Insulation colour: red
• Length: 10 mm
• Outer diameter: 3.5 mm
• Pack quantity: 500 pieces

How to use

Strip the conductor to the appropriate length, insert the stranded copper conductor fully into the copper crimp tube so that strands are contained within the ferrule, and crimp using a properly sized ferrule crimping tool to form a secure mechanical and electrical connection. After crimping, inspect the ferrule to ensure a tight fit and that the insulation sleeve covers the exposed conductor end. Fit the terminated conductor into the terminal block and tighten the terminal screw to the manufacturer’s recommended torque.

What to consider before purchase

• Confirm conductor cross-section is 1.0 mm² and that conductors are copper
• Verify the required ferrule length and outer diameter fit the terminal type you use
• Ensure you have a compatible crimping tool for insulated ferrules of this size
• Assess pack quantity (500) relative to project scale and storage needs

Usage recommendations

Use a dedicated insulated-ferrule crimping tool with indexed dies for consistent crimps. Strip insulation cleanly without nicking conductor strands and avoid over-inserting into the terminal to prevent sleeve deformation. For reliable long-term performance, follow terminal manufacturer torque settings and perform a visual and pull test on representative terminations.