Terminal ferrules Rittal AS 4050.781, copper/polypropylene, 4.2 mm dia, 18 mm length, pack of 500

Rittal AS 4050.781 insulated terminal ferrules combine a copper crimp tube with a polypropylene (PP) insulation collar to provide consistent, secure conductor terminations. Each ferrule measures 4.2 mm in outer diameter and 18 mm in length, and the pack contains 500 pieces. These ferrules are designed for use in electrical wiring, control cabinets and panel assemblies where reliable mechanical and electrical connections are required.

Advantages

Insulated with polypropylene, these ferrules protect the conductor end from fraying and improve insulation at termination points. The copper tube ensures good electrical conductivity and a solid crimp connection that resists vibration and loosening. Supplied in a bulk pack of 500, they support efficient installation workflows and reduce the need for frequent restocking.

Suitable for

• Crimp termination of stranded conductors in control cabinets and electrical panels
• Industrial and building electrical installations requiring standardized ferrule dimensions
• Applications where improved contact reliability and mechanical stability are needed
• Mass wiring projects and maintenance tasks that benefit from bulk-pack consumables

When it may not be suitable

These ferrules are intended for conductors that match the ferrule’s inner diameter and overall dimensions; they may not fit correctly on conductors that require a different ferrule size or different insulation material. They are not designed as a replacement for specialized termination methods such as lugged or soldered connections where those are required by application standards.

Key specifications

• Material: copper crimp tube with polypropylene (PP) insulated collar
• Outer diameter: 4.2 mm
• Length: 18 mm
• Pack quantity: 500 pieces

How to use

Strip the conductor to the appropriate length so that the bare conductor fully inserts into the copper tube. Insert the conductor into the ferrule until the insulation collar seats against the conductor insulation, then crimp using a suitable insulated ferrule crimping tool sized for the ferrule dimensions. After crimping, verify that the conductor is secure by performing a gentle pull test and inspect the crimp for uniform compression. Install the terminated conductor into the terminal block or connector as required.

What to consider before purchase

• Ensure the ferrule inner diameter and length match the conductor cross-section and stripping length
• Confirm compatibility of the ferrule size with your crimping tool and terminal block dimensions
• Consider application requirements for insulation material and environmental factors such as temperature and vibration

Usage recommendations

Use a calibrated, appropriately sized crimping tool and verify crimps visually and mechanically for reliable electrical and mechanical performance. Store the pack in a dry environment to protect the polypropylene collars from contamination or deformation.