Crimp ferrules Rittal AS 4051.540, copper/PP, 0.5 mm², 8 mm length, pack of 4000

Rittal AS 4051.540 crimp ferrules are copper sleeves with polypropylene (PP) insulated collars designed for terminating stranded conductors. They are sized for 0.5 mm² conductor cross-section (approximately AWG 20) and feature an 8 mm sleeve length. Supplied in a pack of 4000 pieces in orange, these ferrules provide a consistent, compact crimp termination for control cabinets, panel building and general electrical installations.

Advantages

The copper core ensures reliable electrical conductivity while the polypropylene collar stabilises the wire and prevents fraying during insertion and crimping. The uniform sleeve length and consistent inner diameter enable repeatable crimp quality across large batches, reducing installation time and rework. The orange insulated collar offers clear visual identification of cross-section and improves handling in confined terminal spaces.

Suitable for

• Crimp termination of stranded wires with 0.5 mm² conductor cross-section (≈ AWG 20)
• Control cabinet wiring and terminal blocks
• Panel building and industrial electrical assemblies
• General electrical installations where insulated ferrules are required

When it may not be suitable

These ferrules are intended for 0.5 mm² stranded conductors; they will not provide correct fit or crimp quality for significantly larger or smaller conductor sizes. They are not intended for uninsulated direct soldering applications or for conductors requiring special high-temperature or chemical-resistant insulation beyond standard polypropylene.

Key specifications

• Conductor cross-section: 0.5 mm² (approx. AWG 20)
• Sleeve material: copper
• Insulation material: polypropylene (PP)
• Sleeve length: 8 mm
• Pack quantity: 4000 pieces
• Colour: orange

How to use

Strip the conductor to the appropriate length so the bare strands fully enter the copper sleeve. Insert the stranded wire straight into the ferrule until the insulation collar aligns with the cable insulation. Use a crimping tool sized for 0.5 mm² ferrules and perform a single, firm crimp to compress the sleeve uniformly around the conductor. After crimping, check that the ferrule is secure and that no stray strands are visible. Insert the terminated wire into the terminal block or connector and fasten according to the terminal manufacturer’s instructions.

What to consider before purchase

• Ensure conductor cross-section compatibility: 0.5 mm² (≈ AWG 20)
• Confirm sleeve length (8 mm) suits your terminal depth and insulation strip length
• Verify polypropylene insulation meets the environmental and temperature requirements of your installation
• Consider pack size (4000 pieces) relative to project needs and storage

Usage recommendations

For consistent, reliable terminations use a dedicated insulated-ferrule crimping die for 0.5 mm². Store ferrules in a dry environment away from direct sunlight to preserve the polypropylene collars. Inspect crimps periodically in critical installations to ensure long-term mechanical and electrical integrity.