Rittal AS 4050.780 copper polypropylene ferrules, blue, 12 mm length, 4.2 mm diameter, pack of 500

Rittal AS 4050.780 copper polypropylene ferrules in blue are crimp end sleeves designed to terminate and protect stranded conductors in electrical installations. Each ferrule combines a conductive copper tube with a polypropylene insulating collar to ensure reliable contact, prevent strand splay, and provide a consistent crimping surface. The ferrules measure 12 mm in length and have an inner diameter suitable for AWG-equivalent conductors around the specified diameter, and they are supplied in a practical pack of 500 for professional or repeat-use environments.

Advantages

These ferrules provide a solid electrical connection by concentrating the conductor strands within a copper sleeve while the polypropylene collar supports easy insertion into terminals and helps prevent short circuits. The uniform dimensions and material choice contribute to repeatable crimp quality, improved mechanical stability, and better current transfer compared with non-terminated stranded wire. The blue collar offers visual identification according to common colour-coding practices.

Suitable for

• Terminating stranded copper conductors for screw, clamp or spring-type terminals
• Electrical panels, control cabinets and junction boxes
• Industrial machinery wiring and installation maintenance
• Repeated installations where consistent crimp quality is required

When it may not be suitable

These ferrules are intended for stranded copper conductors and may not be appropriate for solid conductors or for conductors with insulation types that require specialised termination methods. They are sized for the dimensions given and therefore unsuitable for conductors significantly larger or smaller than the specified diameter.

Key specifications

• Material: copper sleeve with polypropylene insulating collar
• Colour of collar: blue
• Length: 12 mm
• Inner diameter / conductor compatibility: for conductors matching the specified diameter (approx. 4.2 mm external)
• Pack quantity: 500 pieces

How to use

Strip the conductor to the appropriate length, insert the stranded wire into the copper sleeve until the insulation meets the polypropylene collar, and crimp using a suitable ferrule crimping tool. Ensure the correct crimping die or setting is used for the ferrule size to achieve a secure mechanical and electrical connection. After crimping, verify that no strands protrude and that the connection fits properly into the intended terminal.

What to consider before purchase

• Confirm conductor cross-section and strand type match the ferrule dimensions
• Verify compatibility with the terminal type (screw, clamp, spring) used in your installation
• Ensure you have the correct crimping tool and dies for 12 mm ferrules
• Consider pack quantity relative to project size to avoid excess or shortage

Usage recommendations

Use the ferrules with a calibrated crimping tool and appropriate dies; inspect crimps visually and electrically where required. Store in a dry environment away from direct sunlight to preserve the polypropylene collar. Follow local electrical codes and manufacturer guidance when terminating conductors.