Copper Fuse Clips

Copper Fuse Clips

Copper fuse clips — also referred to as fuse holders, fuse contacts, fuse carrier clips, HRC fuse clips, or fuse clip contacts — are spring-formed, cold-pressed copper components that grip, retain, and make low-resistance electrical contact with cartridge-type fuse elements in LV fuse bases, fuse switches, fuse disconnectors, and distribution boards. Electrical Accessories India manufactures pressed copper fuse clips from ETP copper (C11000, IS 191 Grade 1) strip in half-hard (H02) and hard (H04) temper, spring-formed to precise contact geometries for BS 88, IEC 60269, DIN NH, and Indian Standard IS 13703 fuse systems. Copper fuse clips are supplied tin-plated, silver-plated, or as bare copper to switchgear OEMs, fuse gear manufacturers, panel board builders, and electrical component distributors in India and export markets.

Product Overview

Function and Design of Copper Fuse Clips

A copper fuse clip performs three simultaneous functions in a fuse assembly: it mechanically retains the fuse cartridge in its operating position against gravity and vibration; it completes the electrical circuit by making low-resistance metal-to-metal contact with the fuse end caps or ferrules; and it serves as a heat path dissipating thermal energy from the fuse element into the mounting base material and ambient environment. These three functions impose conflicting requirements on clip design — the spring force must be high enough for reliable retention and low contact resistance, but not so high that fuse cartridges are damaged during insertion or removal. ETP copper (100% IACS, C11000) in half-hard temper provides the optimal combination of high conductivity, sufficient spring force, and adequate fatigue life for the required number of fuse insertion/removal cycles.

Copper Alloy Selection for Fuse Clips

ETP copper (C11000, Cu-ETP, IS 191 Grade 1) in half-hard (H02) or hard (H04) strip temper is the standard material for copper fuse clips. The half-hard temper (0.2% proof stress 180–250 MPa) provides controlled spring-back after forming, enabling the clip to maintain designed contact force without permanent set over thousands of fuse replacement cycles. The 100% IACS conductivity of ETP copper ensures the fuse clip itself contributes minimal resistance to the circuit — typically <50 µΩ for a properly formed and tin-plated clip — which is critical for accurate fuse element operation at rated current. Where higher fatigue life is required for frequent fuse replacement applications, phosphor bronze (CuSn6, C51000) strip in spring temper may be used as an alternative to copper.

Fuse Clip Types and Standards

Electrical Accessories India produces copper fuse clips for the full range of LV fuse systems used in India and export markets. BS 88 / IEC 60269 Type gG and gM clips — for high-rupturing-capacity (HRC) cartridge fuses in sizes 16A, 32A, 63A, 100A, 160A, 200A; formed to BS EN 60269-1 ferrule dimensions. IS 13703 fuse clips — compliant with Indian standard for industrial HRC fuse-links; dimensions per IS 13703. DIN NH fuse clips — NH00, NH1, NH2, NH3 fuse systems widely used in European electrical equipment; clip geometry per DIN VDE 0636. Cylindrical (D-type) fuse clips — for D02, D03 domestic fuse systems; spring-formed copper saddle clips for 25A, 63A, 100A ratings. All types available in bare copper, tin-plated, or silver-plated finish.

Spring Forming and Dimensional Control

Copper fuse clip forming requires precise control of spring-back to achieve the specified opening force (fuse insertion force) and holding force (contact pressure on fuse ferrule). Electrical Accessories India uses hard-tooled progressive dies with spring-back compensation built into the forming stations to consistently achieve opening forces within ±10% of design values across the full production run. Critical dimensions controlled: clip opening width (fuse ferrule OD + 0.1–0.3 mm interference for correct grip); clip length (to centre fuse element axially in base); contact surface width (minimum 5 mm copper contact land on ferrule); and mounting hole position tolerance ±0.1 mm. All finished copper fuse clips undergo 100% opening force measurement and dimensional gauging before dispatch.

Tin Plating of Copper Fuse Clips

Tin plating (5–12 µm electrolytic tin, ASTM B545) is the standard surface treatment for copper fuse clips destined for assembled fuse bases and distribution boards. Tin plating prevents copper tarnishing that would increase contact resistance over time; tin also has a low melting point (232°C) that provides a self-annealing effect at high-temperature short-circuit events, maintaining contact integrity. For applications requiring lower contact resistance and extended service intervals — industrial fuse switches, MV fuse bases — silver plating (3–8 µm) is used instead of tin. Bare (unplated) copper fuse clips are supplied for customers who apply their own finishing or use the clips in dry, controlled environments.

Current Rating and Temperature Rise Compliance

Copper fuse clips produced by Electrical Accessories India are dimensioned to carry the rated continuous current of the fuse system with a temperature rise not exceeding 70 K above ambient at rated current — in compliance with IEC 60269-1 and IS 13703 requirements. The clip cross-section, contact width, and copper conductivity are engineered to distribute current uniformly without concentrated hot-spots. Where customers require compliance verification, temperature rise testing on assembled fuse bases at rated current can be arranged at accredited external test laboratories.

Key Features

• Material: ETP copper C11000, IS 191 Grade 1, half-hard (H02) or hard (H04) temper — 100% IACS
• Fuse systems: BS 88 / IEC 60269, IS 13703, DIN NH, D-type cylindrical fuse systems
• Contact resistance: <50 µΩ per clip (tin-plated); <20 µΩ (silver-plated)
• Opening force within ±10% of design value — 100% measured before dispatch
• Plating: tin (5–12 µm), silver (3–8 µm), or bare copper per specification
• Dimensional tolerances: clip opening ±0.05 mm; length ±0.1 mm; hole position ±0.1 mm
• Current ratings: 16A to 630A depending on clip type and size
• ISO 9001:2015 certified; IEC 60269 dimensional compliance available
• XRF purity verification on all incoming copper strip
• High-volume production capacity: up to 500,000+ clips/month

BS 88 / IEC 60269 HRC Fuse Clips

BS 88 type fuse clips are produced for high-rupturing-capacity (HRC) fuses in sizes 16A–630A, with copper contact saddles formed to grip the cylindrical ferrule ends of HRC fuse cartridges. These clips must maintain reliable contact at rated current over years of service and must survive without permanent deformation the mechanical forces generated during a short-circuit rupturing event. Electrical Accessories India produces BS 88 clips for both industrial (Type gG) and motor-protective (Type gM) fuse applications, with dimensions matching the ferrule sizes defined in BS EN 60269-1 and IEC 60269-1 international standards.

DIN NH Fuse Clips

DIN NH (Niederspannungs-HH) fuse clips are produced for NH00 (160A), NH1 (250A), NH2 (400A), and NH3 (630A) fuse systems widely used in European LV distribution panels and switchgear. These clips are larger, spring-formed copper saddle contacts dimensioned to the NH fuse blade connection geometry per DIN VDE 0636-3. NH fuse clips must handle fault-current interruptions without clip distortion or contact degradation. Electrical Accessories India exports NH-type copper fuse clips to European switchgear and distribution board manufacturers as OEM-supplied electrical components.

Cylindrical D-Type Fuse Clips

D02 and D03 type copper fuse clips are used in domestic distribution boards, MCB enclosures, and consumer unit assemblies for cylindrical (bottle-type) fuse cartridges up to 63A and 100A. These are smaller spring-formed clips produced from 0.5–0.8 mm half-hard copper strip in compact saddle profiles. Their small size and high-volume production (typically millions of pieces per year) make them ideal for progressive die manufacturing with fast cycle times. Tin plating is standard for consumer unit applications. Electrical Accessories India supplies these to domestic wiring accessories manufacturers and MCB board producers in large-volume blanket orders.

Technical Specifications

Material Grades and International Equivalents

Product Types and Variants

Copper fuse clips from Electrical Accessories India include: BS 88 / IEC 60269 HRC fuse clips (16A–630A, gG and gM); IS 13703 Indian standard HRC fuse clips; DIN NH fuse clips (NH00–NH3, 160A–630A); D02 / D03 cylindrical fuse clips (up to 63A and 100A); High-current busbar fuse clips (above 630A to 1,250A for special distribution systems); Low-profile fuse clips for compact distribution boards; and custom copper fuse clips to OEM drawing for non-standard or proprietary fuse systems.

Applications in Industry

Copper fuse clips are used in: Industrial LV switchgear — fuse switches, fuse disconnectors, and fused distribution boards; Domestic consumer units — D-type fuse boards and MCB enclosures; Motor control centres — HRC fuse assemblies protecting motor starter circuits; Power distribution boards — main and sub-main fuse boards in commercial and industrial buildings; Renewable energy systems — DC fuse holders for solar PV string protection and battery system protection; Railway and traction systems — HRC fuse bases in traction power supply control panels; Process industries — fuse protection for instrumentation and control panel circuits.

Manufacturing Process

1. Strip Incoming Inspection: ETP copper strip coil received; purity (XRF ≥99.9%), thickness, width, hardness (temper), and surface quality verified against MTR.
2. Die Setup: Progressive forming die loaded in power press; feeder pitch set; lubricant applied to strip.
3. First-Article Inspection: First 20 clips measured; opening width, length, mounting hole position, and spring-back geometry verified against drawing.
4. Opening Force Calibration: Spring-back forming stations adjusted until opening force is within design specification ±5%.
5. Production Run: Automatic production; 100% opening force check on every clip using calibrated gauge.
6. Deburring: Tumble deburring; contact land surfaces polished to Ra 0.4–0.8 µm.
7. Plating: Tin or silver plating per specification; thickness measured by XRF on sample basis.
8. Final Inspection: Opening force 100%; dimensional AQL; visual for plating uniformity and surface defects.
9. Packing: Tray or bulk packing; anti-tarnish paper; moisture barrier for export.

Quality Standards and Certifications

Copper fuse clips manufactured per: ISO 9001:2015 QMS; IEC 60269-1 (low-voltage fuses — clip dimensional requirements); IS 13703 (Indian LV fuses and fuse clip dimensions); EN 1652 (copper strip for general purposes); ASTM B152 (copper sheet and strip); ASTM B545 (electrolytic tin plating); ASTM B700 (silver plating); IEC 60999-1 (connecting devices for copper conductors); EN 10204 2.2 or 3.1 MTRs. RoHS compliant.

Why Choose Electrical Accessories India

Electrical Accessories India has produced copper fuse clips for switchgear OEMs and fuse gear manufacturers for over 30 years. Our in-house progressive die tooling, 100% opening force testing, and certified plating capability deliver fuse clips that perform reliably through millions of fuse replacement cycles. We supply standard fuse clip profiles as catalogue items for rapid delivery, and produce custom clip geometries for OEM proprietary fuse systems with dedicated tooling. Our Jamnagar facility provides the lowest cost-per-clip production economics with full ISO 9001 quality assurance.

Frequently Asked Questions (FAQ)

What is the correct copper temper for fuse clips?

Half-hard (H02) ETP copper strip is standard for most copper fuse clips. This temper provides 0.2% proof stress of 180–250 MPa — sufficient to maintain spring contact force without permanent deformation during normal fuse replacement cycles (typically 50–200 cycles over equipment life). Hard temper (H04) is used for high-cycle-count applications or when higher contact pressure is specified.

What current ratings do your copper fuse clips cover?

Electrical Accessories India produces copper fuse clips for current ratings from 16A (small D02 type) to 630A (large NH3 type) as standard catalogue items. Special high-current clips for 800A and 1,250A fuse systems are available on request with longer lead times for custom tooling.

Do you supply tin-plated fuse clips for outdoor use?

Yes. Tin-plated copper fuse clips (5–12 µm electrolytic tin) are suitable for indoor and protected outdoor applications. For exposed outdoor or tropical coastal environments, thicker tin (12–20 µm) or silver plating is recommended for longer service life. All tin plating meets ASTM B545.

Can you match existing fuse clip dimensions exactly?

Yes. Electrical Accessories India can produce copper fuse clips to customer-supplied samples or dimensional drawings. We provide first-article samples for physical verification and contact resistance testing before mass production commences. DFM review is provided to optimise the forming sequence for the target geometry.

What is the contact resistance of your tin-plated copper fuse clips?

Typical contact resistance for tin-plated ETP copper fuse clips at the clip-to-ferrule interface: 20–50 µΩ at rated current contact force. This is well within IEC 60269 requirements and ensures the clip contributes minimal voltage drop and heat generation to the fuse assembly under rated operating conditions.

What is your lead time for custom fuse clip tooling?

New progressive die tooling for copper fuse clips: 4–6 weeks. First-article samples with full dimensional report and opening force data: 1 week after die completion. Production lead time after first-article approval: 3–4 weeks for standard volumes.

Can you produce fuse clips for DC solar PV applications?

Yes. Copper fuse clips for DC PV string fuse holders (IEC 60269-6 gPV type fuses) are produced in the same materials and process as AC fuse clips. DC fuse clips must maintain reliable contact at lower AC-equivalent current levels across wide temperature ranges (-40°C to +85°C) in outdoor IP65 environments. Electrical Accessories India supplies these to solar equipment manufacturers and energy storage system OEMs.

Equivalent Terms – Multilingual Reference

Related Products and Linked Terms

• Copper Pressing and Copper Pressed Parts
• Brass Stamping – Brass Stamped Parts and Components
• Electrical Pressed Switch Parts in Brass
• Copper Machined Parts
• Brass Terminals

Request a Quote

Supply your fuse type, current rating, drawing, or sample and receive a detailed technical and commercial proposal within 24 hours. Electrical Accessories India engineers are available to advise on clip geometry, copper temper, plating, and current rating compliance for your fuse system application. We export to 30+ countries with full shipping documentation.

Contact us: Send your RFQ with fuse type (BS 88 / IEC / DIN NH / IS 13703), current rating, quantity, plating, and delivery requirement. We respond within 24 business hours.

Indicative Pricing

Copper Items: US$ 15.80 per kilogram, CIF US Port

Prices are indicative and subject to change based on quantity, specification, alloy grade, and market conditions. Contact us with your RFQ for a firm quotation.