500 Volt Industrial Fuse-Links to IEC 60269-2 – Type LSPN Dual Indicator

Lawson Type LSPN Dual Indicator fuse-links are 500V AC NH industrial fuse-links manufactured to IEC 60269-2. Designed for use in industrial switchgear, distribution boards and panel assemblies, they provide reliable overload and short-circuit protection in demanding installations.

The defining feature of the LSPN Dual Indicator is its two built-in visual trip indicators—one fitted at each end of the fuse body. When the fuse element operates, spring-loaded flags pop out from both ends simultaneously. This means the blown condition is immediately visible from either side of a switchgear panel or fuse block, eliminating the need to remove the fuse to confirm whether it has operated. In multi-phase or hard-to-access installations, this can significantly reduce maintenance time and the risk of accidental live contact.

Available in sizes 000, 00, 1, 2C, 2R and 3, covering current ratings from 4A to 630A, the LSPN Dual Indicator range is suitable for general industrial protection with a gG utilisation category. The rectangular ceramic body with metal knife-blade contacts is designed for use with 500 Volt NH Fuse Bases and LUCH NH Fuse Handles.

Manufactured by Lawson Fuses, these fuse-links are supplied with comprehensive technical documentation and are available through Lawson’s authorised distributor network.

Key Features & Benefits

• Dual visual indicator: Spring-loaded trip flags at both ends — blown fuse visible from either side of the panel without removal
• Six fuse sizes: Available in 000, 00, 1, 2C, 2R and 3, covering current ratings from 4A–630A.
• 500V AC rated:Complies with IEC 60269-2 and provides a 120kA breaking capacity.
• Knife-blade contacts: Fits Lawson DFB fuse bases and all standard NH-format holders and switch-disconnectors
• gG characteristic: Full-range protection for cables and general industrial circuits; suitable for semiconductor and motor circuit coordination
• Ceramic body construction: High-strength porcelain tube filled with silica sand for safe arc extinction and fault energy containment
• UK manufactured: Made at Lawson Fuses’ Newcastle facility; ISO 9001 quality management
• ASTA 20 certified: Independent third-party certification to breaking capacity requirements of IEC 60269-2

Typical Applications

LSPN Dual Indicator NH fuse-links are suited to a wide range of 500V industrial protection duties:

• Industrial switchgear and distribution boards where quick blown-fuse identification is required
• Main and sub-distribution feeder circuits in factories, process plant and commercial buildings
• Motor control centres and motor circuit feeders (in coordination with overload relays)
• Semiconductor protection circuits — thyristors, diodes and power converters — where fast-acting, high-breaking-capacity protection is needed
• Panel builder assemblies using standard NH-format fuse switch-disconnectors
• Replacement of existing NH fuse-links in compatible NH fusegear.
• Installations where dual indication enables faster identification of an operated fuse during inspection and maintenance.

How the Dual Indicator Works

Standard NH fuse-links carry a single trip indicator — a spring-loaded pin or flag fitted to one end of the fuse body. When the fuse element melts under a fault condition, the indicator pops out, providing a visible signal that the fuse has operated.

The LSPN Dual Indicator improves on this by incorporating trip indicators at both ends. When the fuse element operates, both flags deploy simultaneously. This has a practical advantage in multi-phase panel assemblies and busbar installations: maintenance engineers can identify which fuses have blown from either side of a mounting assembly or enclosure — without opening doors, rotating fuse blocks, or removing the fuse-link under energised conditions.

In substations, motor control centres and industrial switchboards where space is restricted and access is from alternating sides, the dual indicator design can make a meaningful difference to maintenance speed and safety.

The LSPN Dual Indicator features a 500V NH ceramic body with knife-blade contacts and is designed for use with 500 Volt NH Fuse Bases to IEC 60269-2. Type “LUCH” NH Fuse Handles are used for the safe insertion and removal of NH fuse-links and solid links from NH fuse bases.

Q1: What is the LSPN/DIN fuse-link?

The LSPN/DIN is a 500V a.c. industrial fuse-link with knife blade contacts and dual indication. It is designed for the protection of conductors and complies with IEC 60269-2, DIN 57636-21:1984 and IS/IEC 60269-2:2016. It has a breaking capacity of 120kA and is available in sizes 000, 00, 1, 2C, 2R and 3.

Q2: What sizes and current ratings are available?

The LSPN/DIN fuse-links are available in sizes 000, 00, 1, 2C, 2R and 3, with current ratings ranging from 4A to 630A, depending on the fuse size. Contact Lawson sales for information on available current ratings and product availability.

Q3: What type of indication does the LSPN/DIN fuse-link provide?

The fuse-link features dual indication, allowing the blown fuse to be easily identified during inspection or maintenance. It also incorporates knife blade contacts for use in industrial electrical installations.

Q4: What is the breaking capacity?

120kA breaking capacity provides reliable protection against high fault currents in industrial electrical installations. These fuse-links are rated for 500V a.c. with a gG breaking range and utilisation category.

Q5: Can the LSPN Dual Indicator fuse-links be used for conductor protection?

Yes. The LSPN Dual Indicator fuse-links are designed for the protection of conductors in industrial electrical installations. They feature a gG breaking range and utilisation category, providing full-range protection against overloads and short-circuit faults. Rated at 500V a.c. with a 120kA breaking capacity, they are suitable for a wide range of industrial power distribution and circuit protection applications.

Q6: How do I order LSPN Dual Indicator fuse-links?

To order LSPN Dual Indicator fuse-links or request information on product availability, current ratings, pricing, and pack quantities, please contact the Lawson Fuses sales team at sales@lawsonfuses.com or call 01661 823 232. Trade price lists are also available to registered wholesale partners through the Lawson Knowledge Centre. You can also visit the Lawson Fuses website for more product information and support.