400 Volt Neozed Fuse-Holders to IEC 60269-3 – Type LNZ

400V Neozed Fuse-Holders to IEC 60269-3 – Type LNZ Neozed Fuse Holder | D0 Fuse Holder | D01 Fuse Holder | D02 Fuse Holder | D03 Fuse Holder

Product Introduction

The Lawson Type LNZ is a complete range of Neozed Fuse Holders, fuse bases, and accessories for use with Lawson Type LNZ Neozed (D0-type) fuse-links in 400V a.c. electrical installations. The Neozed system — also known as the D0 fuse system — is the most modern generation of the screw-cap fuse format, introduced as a more compact successor to the Diazed system and designed specifically for 400V a.c. / 250V d.c. low-voltage distribution networks where fuse-links may be accessible to and replaced by non-trained persons.

The D0 fuse system is installed in low-voltage distribution units where fuse-links are accessible to non-trained persons and can also be replaced by them. The Lawson Type LNZ Neozed Fuse Holder range covers all three standard D0 sizes — D01 (E14), D02 (E18), and D03 (M30x2) — in single-pole and multi-pole fuse base configurations. As with the Diazed system, colour-coded gauge pieces physically prevent fuse-links of a higher current rating than the circuit requires from being inserted — providing inherent overrating protection as a passive safety mechanism without any electrical monitoring or intervention.

In addition to fuse bases in all sizes, the Type LNZ accessories range includes replacement screw caps and gauge pieces — making it a fully self-contained Neozed Fuse Holder system for new installations, panel building, and maintenance work across residential, commercial, and light industrial applications.

Key Features

• Neozed Fuse Holder — complete D0-type fuse base and accessories for the Neozed screw-cap fuse system
• D0 Fuse Holder in three standard sizes: D01 (E14), D02 (E18), D03 (M30x2)
• Covers current ratings from 2A to 100A — all standard D0 Neozed current ratings
• Rated 400V a.c. — designed for modern 400V European and UK three-phase and single-phase supply networks
• Compact D0 body — smaller than the equivalent Diazed sizes, making it ideal for space-constrained panel and distribution board applications
• Screw-cap mechanism — tool-free fuse replacement by hand
• Colour-coded gauge pieces — physically prevent insertion of fuse-links with a higher current rating than the circuit’s gauge piece allows (anti-overrating protection)
• DIN rail mounting available — fuse bases can be panel-mounted, busbar-mounted, or DIN-rail mounted
• Compliant with IEC 60269-3 — the international standard for fuses for use by unskilled persons in household and similar installations
• Accessories range: replacement screw caps and gauge pieces for all D0 sizes
• Compatible with Lawson Type LNZ Neozed fuse-links

How the Neozed Fuse Holder System Works

The Lawson Type LNZ Neozed Fuse Holder system uses the same fundamental screw-cap principle as the Diazed system but in a more compact, modern form factor — specifically designed for 400V a.c. networks and DIN-standardised panel equipment.

Fuse Base The fuse base is the fixed component, mounted to the panel, DIN rail, or busbar. It contains the fixed contact, wiring terminals, and the gauge piece housing. The gauge piece physically limits which current rating of fuse-link can be installed — a fundamental safety feature of the D0 Neozed Fuse Holder system.

Screw Cap (Fuse Carrier) The screw cap is the removable carrier that holds the D0 Neozed fuse-link and presses it against the base contact when screwed into the fuse base. Unscrewing the cap allows the fuse-link to be removed and replaced — no tools required. Replacement screw caps are available as accessories for all D0 sizes.

Gauge Piece The colour-coded gauge piece is the anti-overrating insert fitted inside the fuse base. Each gauge piece only accepts fuse-links with an end cap diameter equal to or smaller than that corresponding to the gauge piece’s current rating — making it physically impossible to install a fuse-link of higher rating than the circuit is designed for. Replacement gauge pieces in all current rating colours are available as accessories.

Accessories Available

The Lawson Type LNZ Neozed Fuse Holder accessories range includes:

• Replacement Screw Caps — for D01, D02, and D03 sizes, allowing replacement of worn or damaged screw cap carriers without changing the fuse base
• Gauge Pieces — colour-coded inserts for all current ratings and D0 sizes, ensuring correct anti-overrating protection is maintained in every circuit

Applications

The Lawson Type LNZ Neozed Fuse Holder range is specified in:

• Low-voltage distribution boards — incoming and sub-circuit fusing in residential, commercial, and light industrial distribution units accessible to non-trained persons
• Consumer unit and metering equipment — D0 fuse protection in domestic and light commercial service installations
• Commercial building services — sub-circuit fusing in smaller commercial distribution boards and local distribution equipment
• Industrial control panel sub-circuits — lower current (D01 and D02) sub-circuit protection in space-constrained panel enclosures
• Busbar-mounted distribution equipment — single and three-pole Neozed fuse bases mounted to busbars in distribution equipment
• DIN-rail panel assemblies — DIN-rail mounted Neozed fuse holders in modular panel building applications
• European and international projects — the D0 Neozed system is widely used across Continental Europe and internationally
• Maintenance and replacement — like-for-like replacement of existing Neozed fuse bases, screw caps, and gauge pieces in service

Why Choose Lawson Type LNZ Neozed Fuse Holders?

The D0 Neozed system is the newest generation of screw fuse system and is designed for 400VAC/250VDC networks, with fuse bases available in D01, D02, and D03 sizes. The Lawson Type LNZ Neozed Fuse Holder range combines the inherent anti-overrating safety of the gauge piece system with the compact D0 body size — delivering a fuse protection system that is both inherently safe and economical in panel space. The full accessories range — replacement screw caps and gauge pieces for all sizes — means every aspect of the Neozed Fuse Holder system can be sourced from Lawson, simplifying procurement and maintenance across the installation lifetime.

All Lawson Type LNZ products are manufactured under an ISO 9001 accredited quality management system with test facilities independently accredited to ISO/IEC 17025, and comply with IEC 60269-3 — the international standard for fuse systems for use by unskilled persons in household and similar applications.

D0 Neozed Size Reference

The Lawson Type LNZ Neozed Fuse Holder range covers the three standard D0 Neozed sizes, each defined by its thread/gauge dimension and current range:

Full current rating availability by size — see the Type LNZ Product Information Sheet or contact the Lawson Fuses sales team.

Neozed vs Diazed — Which System?

The Neozed (D0) and Diazed (D-type) systems both use the screw-cap bottle type fuse format with gauge piece anti-overrating protection, but differ in important ways:

The Neozed system is the preferred choice for new 400V a.c. installations due to its more compact dimensions, while the Diazed system remains widely used in existing installations and where 500V or higher current ratings are required.

Q1. What is a Neozed Fuse Holder?

A Neozed Fuse Holder is a screw-cap fuse holder designed for use with D0-type (Neozed) compact bottle-shaped fuse-links. D0-type Neozed fuses were introduced in 1967 and use the same concept as the Diazed system but have a smaller, cylindrical body, available in three sizes with ratings from 2A up to 100A. Fuse holders may be secured by screws to a panel, attached to bus bars, or mounted on DIN rails. The Lawson Type LNZ Neozed Fuse Holder is compliant with IEC 60269-3 and is available in D01, D02, and D03 sizes for 400V a.c. installations.

Q2. What is the difference between D01, D02, and D03 Neozed Fuse Holder sizes?

The three D0 sizes correspond to different gauge thread dimensions and current ranges. The D01 Neozed Fuse Holder (E14 thread) accepts fuse-links rated 2A to 16A. The D02 Neozed Fuse Holder (E18 thread) accepts fuse-links rated 2A to 63A — the most widely used D0 size for general sub-circuit protection. The D03 Neozed Fuse Holder (M30x2 thread) accepts fuse-links rated 80A to 100A for higher-current applications. The three sizes are not interchangeable — the correct size must be matched to the fuse-link and the circuit’s current rating requirement.

Q3. What is the difference between a Neozed Fuse Holder and a Diazed Fuse Holder?

Both are screw-cap fuse systems with inherent gauge piece anti-overrating protection, but the Neozed Fuse Holder (D0 system) is more compact than the equivalent Diazed holder, is rated at 400V a.c. (compared to 500V for Diazed), and covers current ratings up to 100A (compared to 200A for Diazed). The Neozed system is preferred for new 400V installations where panel space is at a premium, while the Diazed system remains in widespread use in existing installations and where 500V or higher current ratings are required.

Q4. How does the gauge piece anti-overrating protection work in the Neozed Fuse Holder?

The gauge piece is a colour-coded insert fitted inside the Neozed fuse base that physically controls the maximum current rating of fuse-link that can be installed. D0 Neozed fuse-links have end cap diameters that vary with current rating — lower ratings have smaller diameters. The gauge piece set in the fuse base only allows fuse-links with an end cap diameter equal to or smaller than the permitted rating to be inserted. This passive, mechanical safety system requires no electrical monitoring and cannot be bypassed without physically removing or replacing the gauge piece.

Q5. What voltage rating is the Lawson Type LNZ Neozed Fuse Holder?

The Lawson Type LNZ Neozed Fuse Holder range is rated at 400V a.c. — the standard voltage for modern European and UK three-phase electrical supply networks. This is specifically matched to the 400V a.c. design of the D0 Neozed fuse system, which was developed to align with the current maximum voltage of European three-phase household and commercial installations.

Q6. Can Neozed Fuse Holders be mounted on DIN rails?

Yes. Neozed fuse holders may be secured by screws to a panel, attached to bus bars, or mounted on DIN rails making the Lawson Type LNZ Neozed Fuse Holder system compatible with a wide range of panel building, distribution board, and modular enclosure assembly approaches.

Q7. What accessories are available for the Type LNZ Neozed Fuse Holder?

The Lawson Type LNZ accessories range includes replacement screw caps for all three D0 sizes (D01, D02, D03) — allowing worn or damaged carriers to be replaced without changing the fuse base — and gauge pieces in all current rating colours for all sizes, enabling the correct anti-overrating protection to be set or updated within the fuse base as required.

Q8. What fuse-links are compatible with the Lawson Type LNZ Neozed Fuse Holder?

The Type LNZ Neozed Fuse Holder is designed for use with Lawson Type LNZ Neozed (D0-type) fuse-links in the correct D0 size (D01, D02, or D03) and current rating for the circuit. The fuse base size, gauge piece setting, and fuse-link current rating must all be correctly matched. Neozed fuse-links from other manufacturers conforming to the same D0 dimensional standard are also compatible provided voltage and current ratings are appropriate.

Q9. Is the Neozed system suitable for new installations?

Yes. The Neozed D0 system is considered the most modern of the screw-cap fuse systems and is specifically designed for current 400V a.c. / 250V d.c. network requirements. Its compact dimensions make it well suited to modern space-efficient panel designs, and its IEC 60269-3 compliance confirms its suitability for low-voltage distribution equipment accessible to non-trained persons. For new installations where higher current ratings (above 100A) or 500V ratings are required, the Lawson Type LD Diazed system should be considered instead.

Q10. How do I order the Lawson Type LNZ Neozed Fuse Holder?

The full Lawson Type LNZ Neozed Fuse Holder range — including fuse bases in D01, D02, and D03 sizes, replacement screw caps, and gauge pieces — is available through the Lawson Fuses sales team and their network of authorised sales partners and electrical wholesalers across the UK. Contact Lawson Fuses directly for trade pricing, availability by size and current rating, and technical support for your installation or panel building project.