Rittal AS 4051.536 copper polypropylene ferrules, 0.5 mm² (AWG 20), 2 x 10 mm, pack 4000

Rittal AS 4051.536 copper polypropylene ferrules are insulated wire end sleeves designed for crimp termination of stranded conductors. Each ferrule features a copper barrel that provides low electrical resistance and a polypropylene (PP) collar that insulates and guides the conductor into the barrel. The ferrules are specified for a 0.5 mm² (AWG 20) conductor cross-section, with a 10 mm barrel length and a 2.9 mm collar diameter. They are supplied in a pack of 4000 pieces and are suitable for systematic wiring in control cabinets, terminal blocks, and wiring harnesses where reliable, repeatable terminations are required.

Advantages

These ferrules combine a solid copper crimp section with a polymer collar to reduce strand splaying and provide secure mechanical and electrical contact. The polypropylene collar supports insertion into screw terminals and improves insulation between adjacent conductors. Available in a bulk pack of 4000 pieces, they simplify high-volume assembly and maintenance tasks and promote consistent crimp quality when used with compatible crimping tools.

Suitable for

• Termination of stranded conductors rated 0.5 mm² (AWG 20)
• Control cabinet wiring and distribution blocks
• Terminal strips, relays and connector housings that accept insulated ferrules
• High-volume assembly and electrical panel production

When it may not be suitable

These ferrules are intended for conductors with a cross-section of 0.5 mm² (AWG 20); they are not suitable for larger or smaller conductor sizes and may not provide reliable results if used outside the specified range. They require a proper insulation-displacement or crimping tool matched to insulated ferrules—hand twisting or improper tooling can lead to poor electrical contact or mechanical failure.

Key specifications

• Material of barrel: copper
• Insulation collar material: polypropylene (PP)
• Conductor cross-section: 0.5 mm² (AWG 20)
• Barrel length: 10 mm
• Collar diameter: 2.9 mm
• Pack quantity: 4000 pieces

How to use

Strip the conductor to the recommended length so that the strands fully enter the copper barrel without exposing excess bare conductor beyond the collar. Insert the stranded conductor into the ferrule until the insulation collar seats against the wire insulation, then apply a crimping tool designed for insulated ferrules to compress the copper barrel uniformly. After crimping, verify mechanical retention by a gentle pull test and confirm good electrical contact with continuity or resistance measurement when required.

What to consider before purchase

• Verify conductor cross-section compatibility (0.5 mm² / AWG 20)
• Confirm that terminal blocks or connectors accept insulated ferrules with a 2.9 mm collar diameter
• Ensure availability of a compatible crimping tool rated for insulated ferrules
• Check quantity requirements—pack contains 4000 pieces suitable for bulk use

Usage recommendations

Use a certified insulated-ferrule crimping tool and the manufacturer’s recommended die to achieve consistent crimp quality. Store ferrules in a dry environment to avoid contamination of the copper barrel and keep packs sealed until use to maintain inventory control for panel assembly and maintenance tasks.