Enclosure Accessory Rittal AS 4055.779 — metallic, round 21.0 mm matryce

Rittal AS 4055.779 is a metallic round 21.0 mm matryce (female die) intended for use with compatible male dies to produce precise circular openings in enclosure doors, panels and busbars. Designed for electrical enclosures and control cabinets, this accessory enables accurate, repeatable hole-making for panel-mounted components, cable glands and instrument cutouts. The metallic construction provides durability for repeated use in industrial and workshop settings.

Advantages

The female die delivers precise, consistent 21.0 mm round holes when paired with the correct male die, reducing manual finishing work and ensuring uniform panel fitment. Its metallic build resists wear and maintains cutting accuracy over multiple operations. The accessory is compact and straightforward to integrate into existing punching or forming workflows for Rittal enclosures and similar metal panels.

Suitable for

• Punching 21.0 mm round openings in enclosure doors and panels
• Creating mounting holes for switches, LEDs, and small instruments
• Producing clean round holes in busbars when used with the matching male die
• Panel preparation in workshops and electrical assembly lines

When it may not be suitable

This matryce is a female die only and must be used together with the matching male die to perform punching operations; it cannot create holes by itself. It is intended for 21.0 mm round holes only and is not suitable for other diameters or non-circular cutouts. For very thick or hardened materials, confirm compatibility with your punching equipment to avoid damage or diminished performance.

Key specifications

• Type: Female round die (matryce)
• Nominal hole diameter: 21.0 mm
• Finish: Metallic
• Intended use: Panel and busbar punching (requires matching male die)
• Compatibility: Designed for use with Rittal enclosure systems and suitable punching/forming tools

How to use

Fit the female die into the appropriate holder of your punching or forming machine and install the corresponding male die in the mating position. Position the panel or busbar accurately and secure it before actuating the tool. Perform a test punch on scrap material to confirm alignment and hole quality, then proceed with production. After use, clean debris from the die edges and store in a dry place to maintain performance.

What to consider before purchase

• Verify you have the correct matching male die for 21.0 mm round punching
• Confirm that your punching equipment supports the die type and material thickness
• Ensure the accessory is suitable for the panel material (e.g., steel, aluminium) you will be working with
• Consider spare dies if you expect frequent or heavy usage

Usage recommendations

Use the female and male die pair only with compatible punching/forming machines and follow equipment safety guidelines. Regularly inspect and, if necessary, replace worn dies to maintain hole quality and prevent damage to panels or busbars.