Miniature Fuses

Product catalog summary

Introduction
The 2007 SIBA catalogue offers a detailed overview of miniature fuses and protective devices, designed to prevent overloads in sectors such as IT, telecommunications, household appliances, and industrial applications. With over 60 years of experience, SIBA ensures reliable quality and safety in high and low voltage protective devices.

Product Range
The catalogue features classical cylindrical fuses, microfuses, SMD technology, and custom designs, covering a wide range of standards and applications from sub-miniature to high voltage technology. Each section includes detailed specifications like dimensions, rated voltage, characteristics, and breaking capacity.

Technical Notes
This section explains terms, standards, basic diagrams, and fuse characteristics, along with selection guides to help choose the appropriate fuse for specific applications. Emphasis is placed on quality and reliability in fuse performance.

Selection Diagram
A flowchart assists users in selecting the right fuse, supported by SIBA specialists who offer personalized assistance and product customization.

Fuse-Links and Holders
Details on various types of fuse-links and holders are provided, including specifications for sub-miniature fuses and high-voltage applications, with information on dimensions, rated voltage, current, and applicable standards.

Additional Notes
Includes a cross-reference list for comparing different types of fuses and ensuring compatibility with existing systems.

Conclusion
The catalogue is user-friendly, with clear layouts and comprehensive information to aid in fuse selection and application. Customers are encouraged to contact SIBA for further assistance and customization options.

General Information

Introduction: Miniature fuses protect electrical plants, appliances, and modules from high current loads, used in consumer electronics and industrial applications.
Designs: Traditional fuses are cylindrical, handling short-circuit currents up to several kiloamperes at voltages up to 1000 V. Sub-miniature and SMD fuses are used for PCB mounting, with rated voltages up to 250 V.

Technical Notes

Terminology: Fuses consist of a fuse-link and a fuse-holder. The fuse-link contains the fuse-element, which melts to break the circuit when the rated current is exceeded.
Rated Voltage (Urat): The r.m.s. value of a sinusoidal alternating voltage at 50 Hz.
Rated Current (Irat): The r.m.s. value under which the fuse-link can operate permanently.
Rated Breaking Capacity (I1): The maximum current the fuse-link can switch off at the rated voltage.
Voltage Drop (ΔU): Determined at the rated current and 23°C ambient temperature.
Pre-arcing and Operating Integrals (I²tS, I²tA): Measure the electrical load leading to the melting of the fuse-element and the load on downstream components during a short circuit.
Power Dissipation (Pv): Calculated by multiplying the non-fusing current by the voltage drop after one hour.

Structure of Miniature Fuse-Links

Glass Tube: Used for currents up to 35 A or max. 10 Irat, offering low voltage drop.
Reinforced Glass Tube: Handles currents up to 150 A at rated voltage.
Filled Glass and Ceramic Tubes: Can switch off currents up to 1000 A and several kA, respectively, using quartz sand filling.
Terminal Caps: Made from copper alloy, treated for better contact and corrosion protection.

Characteristics

Time/Current Performance: Fuses are categorized by their response time, from very quick-acting (FF) for semiconductor protection to super time-lag (TT) for motors.

Standards

IEC 60127 is the primary international standard, with VDE 0820 as the German equivalent.

Specifications and Types of Fuses:
Fuses are categorized based on their time-lag characteristics: M (medium time-lag) for low voltages without high inrush currents, T (time-lag) for high inrush currents like transformers, and TT (long time-lag) for very high and long-lasting inrush currents such as motors.

Standards:
The primary global standard for fuses is IEC 60127, which includes general guidelines, specific fuse designs, fuse-holders, quality confirmation, and a user manual. The German equivalent is VDE 0820. In North America, UL 248 is the reference standard, and care must be taken when converting rated currents between IEC 60127 and UL 248.

Applications:

Rated Currents: Different international standards define rated currents differently, preventing direct conversion between IEC 60127 and UL 248-14.
Low Voltage Operation: Fuse-links can operate at voltages below their rated voltage, but the voltage drop must be considered, especially at low rated currents.
Ambient Temperature: Fuse-links are designed for 23°C, but installation conditions can affect the rated current.
Pulse Loads: Pulse loads in circuits require consideration of the fuse-link's pre-arcing integral I²t.
Semiconductor Protection: The I²t value of the fuse-link should match the energy pulse of the component being protected.
Fuse-Holder Power Acceptance: The power dissipation of the selected fuse-link must not exceed the fuse-holder's maximum power acceptance.

Safety and Quality:
SIBA ensures quality through a documented quality management system based on DIN EN ISO 9001 and an environmental management system according to DIN EN ISO 14001.

Technical Data and Characteristics:
The document provides detailed specifications for various types of sub-miniature fuses, including construction, resistance to soldering heat, vibration standards, insulation resistance, packing options, fusing time limits, rated current, voltage drop, cold resistance, and I²t values. It also includes diagrams for time-current characteristics and recommended pad layouts.

Overview: This document provides technical specifications for various types of sub-miniature fuses manufactured by SIBA GmbH & Co. KG. The fuses are categorized by type and include details on construction, packaging, fusing time limits, rated current, breaking capacity, voltage drop, power dissipation, and approvals.

Construction: The fuses are constructed with a non-transparent ceramic tube and silver-plated brass contact caps. They are resistant to soldering heat up to 260°C for 10 seconds, compliant with IEC 60068 standards.

Packaging: The fuses are available in packs of 100 pieces or 1000 pieces on tape (GT).

Fusing Time Limits: The document outlines the fusing time limits for different rated currents, specifying minimum and maximum times for various multiples of the rated current (e.g., 1 In, 2 In, 2.75 In, etc.).

Rated Current and Breaking Capacity: Each fuse type is listed with its rated current, breaking capacity, voltage drop, cold resistance, and I²t value. The breaking capacity is typically 50 A at AC/DC 125 V or 250 V, depending on the type.

Approvals: The fuses have various approvals, including UL recognition and compliance with standards such as UL 246-14, CSA C22.2 No. 248.14, and IEC 60127.

Time-Current Characteristics: The document includes time-current characteristic curves for each fuse type, illustrating the relationship between time and current for different rated currents.

Dimensions and Recommended Pad Layout: Dimensions for each fuse type are provided, along with recommended pad layouts for mounting.

Additional Information: Some fuse types include related products such as fuse holders, and additional non-standard ratings are available upon request.

Overview: This document provides technical specifications for various types of fuse holders designed for miniature fuse-links. The specifications include rated voltage, current, power, dielectric strength, protection standards, mounting options, and approvals.

Specifications:

Rated Voltage: Ranges from 250 V to 500 V AC depending on the type.
Rated Current: Varies from 6.3 A to 30 A, with different standards for VDE, UL, and CSA.
Rated Power: Typically 2.5 W to 4 W depending on the current rating.
Dielectric Strength: Consistently 3 kV across all types.
Protection Standard: IP 40, indicating protection against solid objects larger than 1 mm.
Shocksafe Category: PC2, providing basic protection against accidental contact.

Mounting and Connections:

Mounting Options: Includes front panel, printed circuit board, and in-line options.
Connection Types: Solderable, plug, and quick-connect options are available.
Locking Mechanisms: Bayonet cap and screw cap types are used for securing the fuse.

Approvals: Most types are approved by VDE, UL recognized, and CSA, ensuring compliance with international safety standards.

Additional Features:

Distortion Protection: Some models include features to prevent rotation during installation.
Material Specifications: Contact caps are made of brass, silver-plated, and wire-ends are copper, tinned.

Variants: The document lists several types with specific dimensions and applications, including high-voltage open-type fuse holders.