400/415 Volt Industrial Fuse-links to IEC 60269-2/BS 88-2 – Type N&T

400/415V Industrial Fuse-Links to IEC 60269-2 / BS 88-2 – Type N&T HRC Fuse | BS Bolted Type Fuse Link | Industrial Bolted Type Fuse | BS Bolted Type 415V Fuse | 400/415V Industrial Fuse Links

Product Introduction

The Lawson Type N&T is the most comprehensive range of HRC Fuse links and BS Bolted Type Fuse Links available for 400/415V industrial electrical installations. Covering BS 88 reference sizes from BS88 Size A1 through to BS88 Size C3 — and including central tag, offset tag, and motor circuit protection variants — the Type N&T Industrial Bolted Type Fuse range is the standard choice for panel builders, electrical contractors, switchgear manufacturers, and maintenance engineers specifying BS 88-2 industrial fuse protection across the full spectrum of current ratings from 2A to 800A.

Fully compliant with IEC 60269-2 and BS 88-2 — the international and British standards for industrial high rupturing capacity (HRC) fuse-links — the Lawson Type N&T BS Bolted Type 415V Fuse range includes all standardised ratings and sizes, together with additional non-standard current ratings and motor circuit protection (gM) variants for direct-on-line and star-delta motor starter applications. All fuse-links can be fitted in Lawson Boltin (LBI) fuse-holders or suitable distribution fusegear.

Key Features

• HRC Fuse (High Rupturing Capacity) — rated 80kA a.c. / 40kA d.c. breaking capacity at 415V a.c. / 250V d.c.
• BS Bolted Type Fuse Link — bolted tag connection design for secure, low-resistance industrial panel mounting
• Industrial Bolted Type Fuse for 400/415V three-phase industrial installations
• BS Bolted Type 415V Fuse — covers full BS 88-2 standardised current ratings and sizes
• Covers BS88 Size A1 (NIT), A2 (TIA), A3 (TIS), A4 (TCP) — offset tag fuse-links 2A to 200A
• Covers BS88 Size B1 (TC/TBC), B2 (TF/CTF), B3 (TKF), B4 (TMF) — central tag fuse-links 2A to 400A
• Covers BS88 Size C1 (TM), C2 (TTM), C3 (TLM) — large central tag fuse-links 355A to 800A
• Motor circuit protection (gM) fuse-links — available for NIT (A1), TIA (A2), TIS (A3), TCP (A4), TB, TBC, TC, TF, TFP, TKF, TMF, and TM series
• Rated voltages: 415V a.c. / 250V d.c. — suitable for three-phase AC and DC industrial circuits
• Utilisation categories gG and gM — general purpose and motor circuit protection variants
• Compliant with IEC 60269-2 / BS 88-2 — internationally certified industrial HRC fuse standard
• Compatible with Lawson Type LBI Boltin Industrial Fuse-Holders

Offset Tag Fuse-Links — BS88 Size A1 to A4

BS88 NIT — BS88 Size A1 Fuse (44.5mm fixing centres)

The BS88 NIT (BS88 A1 Fuse) is the smallest offset tag HRC Fuse in the N&T range, with 44.5mm (1¾ inch) fixing centres and available in ratings from 2A to 32A at 400/415V. The NIT also supports motor circuit protection variants — NIT20M25, NIT20M32, NIT32M40, NIT32M50, and NIT32M63 — for direct-on-line motor starter applications in the smaller current range.

BS88 TIA — BS88 Size A2 Fuse (73mm fixing centres)

The BS88 TIA (BS88 A2 Fuse) offset tag BS Bolted Type 415V Fuse is available from 2A to 32A with 73mm (2⅞ inch) fixing centres. Motor circuit protection variants — TIA32M40, TIA32M50, and TIA32M63 — are available for star-delta and DOL motor starter protection.

BS88 TIS — BS88 Size A3 Fuse (73mm fixing centres)

The BS88 TIS (BS88 A3 Fuse) offset tag Industrial Bolted Type Fuse covers ratings from 35A to 125A with 73mm fixing centres. Motor protection variants include TIS63M80, TIS63M100, and TIS100M125.

BS88 TCP — BS88 Size A4 Fuse (94mm fixing centres)

The BS88 TCP (BS88 A4 Fuse) is the largest offset tag size in the N&T range, with 94mm (3 11/16 inch) fixing centres and available from 6A to 100A (TCP), with CTFP and TFP variants extending the range to 200A. Motor protection variants — TCP100M125, TCP100M160, TCP100M200, TFP200M250, TFP200M315 — are available for larger motor starter applications.

Central Tag Fuse-Links — BS88 Size B1 to C3

BS88 B1 Fuse — TC / TBC Series (111mm fixing centres)

The BS88 B1 Fuse (TC and TBC series) central tag HRC Fuse covers 80A and 100A at 111mm fixing centres. TBC series (as B1) also covers 2A to 63A. Motor protection variants — TC100M125, TC100M160, TC100M200, TBC63M80, and TBC63M100 — support motor circuit applications. TB series (97mm centres) covers 2A to 63A as a non-standard variant.

BS88 B2 Fuse — TF / CTF Series (111mm fixing centres)

The BS88 B2 Fuse (TF and CTF series) BS Bolted Type Fuse Link covers 125A, 160A, and 200A at 111mm fixing centres. Motor protection variants — TF200M250 and TF200M315 — are available for larger motor starting applications.

BS88 B3 Fuse — TKF Series (111mm fixing centres)

The BS88 B3 Fuse (TKF series) Industrial Bolted Type Fuse covers 250A and 315A at 111mm fixing centres. A motor protection variant — TKF315M400 — is available for high-current motor starting.

BS88 B4 Fuse — TMF Series (111mm fixing centres)

The BS88 B4 Fuse (TMF series) covers 355A and 400A at 111mm fixing centres. Motor protection variant TMF400M500 available.

BS88 C1 Fuse — TM Series (133mm / 184mm fixing centres)

The BS88 C1 Fuse (TM series) BS Bolted Type 415V Fuse covers 355A and 400A with G1 fixing centres of 133mm and G2 of 184mm. Motor protection variant TM400M500 available. TMT variant with 165mm / 229mm fixing centres also available.

BS88 C2 Fuse — TTM Series (133mm / 184mm fixing centres)

The BS88 C2 Fuse (TTM series) HRC Fuse covers 450A, 500A, 560A, and 630A with G1 133mm and G2 184mm fixing centres. TT variant with 165mm / 229mm fixing centres also available.

BS88 C3 Fuse — TLM Series (133mm / 184mm fixing centres)

The BS88 C3 Fuse (TLM series) is the largest standard central tag Industrial Bolted Type Fuse in the N&T range, covering 670A, 710A, 750A, and 800A with G1 133mm and G2 184mm fixing centres. TLT (165mm / 229mm) and TLU D1 (149mm / 32mm) variants are also available for 670A–800A.

Motor Circuit Protection Fuse-Links

The Lawson Type N&T HRC Fuse range includes a comprehensive schedule of gM-rated motor circuit protection fuse-links — dual-rated fuse-links that provide the overload current rating of the circuit alongside an enhanced motor starting rating to accommodate direct-on-line (DOL) and star-delta motor starting current surges without nuisance operation.

Motor circuit protection variants are available across BS88 sizes A1 (NIT), A2 (TIA), A3 (TIS), A4 (TCP/TFP), B1 (TC/TBC/TB), B2 (TF), B3 (TKF), B4 (TMF), and C1 (TM) — covering motor starting current equivalents from NIT20M25 through to TM400M500.

A full schedule of Motor Starting Capability is available in the Type N&T Product Information Sheet.

Applications

The Lawson Type N&T HRC Fuse, BS Bolted Type Fuse Link, and 400/415V Industrial Fuse Links range is specified across all sectors of UK industrial and commercial electrical engineering:

• Industrial distribution panels and switchgear — main and sub-circuit fusing in motor control centres (MCCs), distribution boards, and switchfuse units
• Motor circuit protection — gM-rated motor fuse-links for direct-on-line and star-delta starters
• Industrial machinery — fusing for machine tools, conveyors, compressors, pumps, and process plant
• Power distribution and bus-coupler panels — high-current fusing in primary and secondary LV distribution equipment
• Transformer protection — primary and secondary side HRC fuse protection for distribution transformers
• High fault level industrial installations — 80kA breaking capacity suitable for the highest prospective fault levels
• Commercial building services — mechanical plant, lifts, HVAC, and large commercial distribution
• Utilities and water industry — pump and process equipment protection
• Data centre and critical power — main distribution and sub-circuit fusing in critical power environments

Why Choose Lawson Type N&T?

The Lawson Type N&T HRC Fuse range is one of the most complete BS Bolted Type Fuse Link offerings available from a UK manufacturer — covering every BS 88-2 standardised size from BS88 A1 to BS88 C3, all current ratings from 2A to 800A, and a comprehensive gM motor circuit protection schedule. With dimensional and current rating compliance to IEC 60269-2 and BS 88-2, 80kA a.c. breaking capacity, and ASTA Certification to the ASTA 20 Authorisation Scheme, the Type N&T is the Industrial Bolted Type Fuse that electrical engineers, panel builders, and switchgear manufacturers across the UK and internationally rely on.

All products are manufactured under an ISO 9001 accredited quality management system with test facilities independently accredited to ISO/IEC 17025 — ensuring consistent, documented performance in every BS88 NIT, BS88 TIA, BS88 TCP, and BS88 TF fuse-link that leaves the factory.

Q1. What is an HRC Fuse?

An HRC Fuse (High Rupturing Capacity Fuse) is a fuse-link designed to safely interrupt very high fault currents — up to 80kA a.c. in the case of the Lawson Type N&T — without the explosive or hazardous failure modes associated with lower-specification fuses. HRC fuse-links are filled with arc-quenching material (typically quartz sand) that absorbs the energy of the arc when the fuse operates. The Lawson Type N&T is a BS Bolted Type HRC Fuse for 400/415V industrial installations, covering BS88 sizes A1 to C3 in current ratings from 2A to 800A.

Q2. What is a BS Bolted Type Fuse Link?

A BS Bolted Type Fuse Link is an industrial HRC fuse-link that connects to its fuse holder or distribution equipment via bolted tag connections — the fuse-link is physically bolted to the fuse holder base using fixing bolts at the specified fixing centres. This provides a secure, low-resistance, high-current-carrying connection suitable for the demanding conditions of industrial distribution panels, motor control centres, and switchgear. The Lawson Type N&T is a BS Bolted Type Fuse Link covering central tag and offset tag designs across all BS 88-2 standardised sizes.

Q3. What is the difference between BS88 Size A1, A2, A3, and A4?

BS 88 size references define the physical dimensions and fixing centres of the offset tag fuse-links in the N&T range. BS88 Size A1 (NIT) has 44.5mm fixing centres and covers 2A–32A. BS88 Size A2 (TIA) has 73mm fixing centres covering 2A–32A. BS88 Size A3 (TIS) also has 73mm fixing centres but covers the higher current range 35A–125A. BS88 Size A4 (TCP/CTFP/TFP) has 94mm fixing centres covering 6A–200A. The sizes are not interchangeable — the correct BS 88 size must be matched to the fuse holder or distribution equipment being used.

Q4. What is the difference between BS88 Size B1, B2, B3, and B4?

The BS88 B sizes cover the central tag fuse-links in the mid to high current range. BS88 B1 (TC/TBC) uses 111mm fixing centres and covers 2A–100A. BS88 B2 (TF/CTF) uses 111mm centres for 125A–200A. BS88 B3 (TKF) uses 111mm centres for 250A–315A. BS88 B4 (TMF) has shorter 111mm (3 11/16 inch) centres for 355A–400A. Again, sizes are not interchangeable and must be matched to the fuse holder.

Q5. What is the difference between BS88 Size C1, C2, and C3?

The BS88 C sizes are the largest central tag industrial fuse-links. BS88 C1 (TM) covers 355A–400A with G1 133mm and G2 184mm fixing centres. BS88 C2 (TTM) covers 450A–630A with the same G1/G2 dimensions. BS88 C3 (TLM) covers the highest current range 670A–800A, also with G1 133mm and G2 184mm centres. These large format BS Bolted Type 415V Fuses are used in primary distribution boards, large motor control centres, and transformer protection applications.

Q6. What are BS88 NIT, BS88 TIA, and BS88 TCP fuse-links?

These are the list reference designations for specific offset tag HRC Fuse series in the Lawson Type N&T range. BS88 NIT refers to the BS88 Size A1 offset tag fuse-link (44.5mm centres, 2A–32A). BS88 TIA refers to the BS88 Size A2 offset tag fuse-link (73mm centres, 2A–32A). BS88 TCP refers to the BS88 Size A4 offset tag fuse-link (94mm centres, 6A–100A). Each series has a defined physical size that must be matched to the corresponding fuse holder or distribution equipment fixing centres.

Q7. What is a motor circuit protection (gM) HRC fuse-link?

A motor circuit protection HRC Fuse with gM utilisation category is a dual-rated fuse-link designed to protect motor circuits. It carries two current ratings — a continuous current rating (matching the motor’s full-load current) and a higher motor starting rating (accommodating the short-duration inrush current during direct-on-line or star-delta starting). For example, NIT20M25 is rated 20A continuous with a 25A motor starting rating. Using a gM motor fuse-link avoids the need to oversize the fuse rating to accommodate starting current, providing more accurate overload protection for the motor circuit wiring.

Q8. What breaking capacity does the Lawson Type N&T HRC Fuse have?

The Lawson Type N&T Industrial Bolted Type Fuse has a breaking capacity of 80kA a.c. at 415V and 40kA d.c. at 250V — matching the highest performance tier in IEC 60269-2 and BS 88-2. This 80kA breaking capacity makes the Type N&T suitable for use in the most demanding industrial installations, including those close to supply transformers and large capacity busbars where prospective fault currents are at their highest.

Q9. What fuse holders are compatible with the Lawson Type N&T BS Bolted Type Fuse Link?

The Lawson Type N&T BS Bolted Type 415V Fuse range is designed for use with Lawson Type LBI Boltin Industrial Fuse-Holders, as well as other suitable BS 88-2 compliant distribution fusegear and switchfuse units. The fuse holder must match the BS 88 size reference (A1–C3), fixing centre dimension, and current rating of the fuse-link being installed.

Q10. How do I select the correct BS 88 size for my application?

Selecting the correct BS88 size for your Industrial Bolted Type Fuse application requires matching the BS 88 reference to the existing fuse holder or distribution equipment in the panel — this is determined by the physical fixing centre dimension of the equipment’s fuse base. The current rating is then selected based on the circuit’s design current and the type of load (gG for general purpose, gM for motor circuits). For full guidance, download the Type N&T Product Information Sheet or contact the Lawson Fuses technical sales team.