Ferrule Rittal AS 4051.538, copper + PP insulated, 3.5 mm diameter, 10 mm length, pack of 4000

Rittal AS 4051.538 insulated ferrules are copper conductor end sleeves with polypropylene (PP) insulation, sized for secure terminations in electrical installations. With a 3.5 mm outer diameter and 10 mm total length, these ferrules are supplied in a bulk pack of 4000 pieces and are intended for reliable crimp connections on stranded conductors in control cabinets, panels and machine wiring. The ferrules combine a plated copper barrel for good conductivity and corrosion resistance with a molded PP collar that ensures a consistent insulation stop and easier insertion into terminals.

Advantages

These ferrules provide a consistent, professional end termination that helps prevent strand fraying, improves contact reliability and eases crimping operations. The copper barrel offers low electrical resistance and compatibility with most common crimp tools, while the PP insulated collar provides electrical isolation at the termination point and a tactile stopper for repeatable insertion depth. Supplied in a large pack, they are suited for production and maintenance tasks where a steady supply is required.

Suitable for

• Crimping stranded copper conductors for control cabinets and distribution panels
• Terminal block and screw terminal connections where a neat, secure termination is needed
• Electrical installation and maintenance in industrial and commercial environments
• Applications requiring corrosion-resistant copper contacts with insulated collars

When it may not be suitable

These ferrules are intended for use with stranded copper conductors of a matching cross-section; they are not suitable for use on solid conductors or conductors made of materials other than copper without verifying compatibility. They are sized for terminations that accept a 3.5 mm diameter ferrule; using them in undersized or oversized terminals may compromise the connection.

Key specifications

• Material: copper barrel with polypropylene (PP) insulated collar
• Outer diameter: 3.5 mm
• Length: 10 mm
• Pack quantity: 4000 pieces
• Typical use: crimp termination of stranded conductors

How to use

Strip the conductor to the appropriate length so that the bare strands fully enter the copper barrel without exposing excess bare wire beyond the insulated collar. Insert the stranded conductor into the ferrule until the insulation collar meets the conductor insulation. Use a suitable ferrule crimping tool sized for this ferrule to perform a complete, square crimp on the barrel; follow the crimper manufacturer's settings for the conductor cross-section. After crimping, visually inspect the joint to confirm the strands are compacted and the collar sits flush with the conductor insulation before placing into the terminal.

What to consider before purchase

• Verify conductor cross-section compatibility and terminal acceptance for a 3.5 mm ferrule diameter
• Confirm material suitability for the application environment (copper barrel, PP insulation)
• Ensure you have a compatible crimping tool and die set for the ferrule size
• Assess whether the bulk pack quantity (4000 pieces) matches your usage needs

Usage recommendations

Use these ferrules with a matched crimping tool and correct conductor strip length for consistent connections; store in a dry area to maintain the integrity of the insulation collars and avoid exposure to aggressive chemicals that could degrade polypropylene.