Last Updated: November 6, 2024 Reviewed by: Scott Orlosky, consulting engineer
Description
IEC 269-2 1 fuses are a type of fuse designed to provide overcurrent protection in electrical circuits. These fuses act as a weak link in the circuit, reliably rupturing and isolating the faulty circuit under overload and short-circuit fault conditions to protect equipment and personnel. They must be manually replaced after fault clearance before the circuit can be put back into operation. Some designs include striker pins that can initiate remote alarms upon fuse operation.
Working Principle
The working principle of IEC 269-2 1 fuses involves the melting of a fusible element when the current exceeds a specific threshold. This melting interrupts the electrical flow, thereby protecting the circuit from damage due to overcurrent. The voltage rating of the fuse indicates its ability to extinguish the arc generated as the fuse element melts under fault conditions. The current rating must exceed the maximum DC or RMS current demanded by the protected circuit, and the let-through current, or I²t rating, is crucial for selecting the correct fuse.
Applications
IEC 269-2 1 fuses are used in various applications where overcurrent protection is essential. These include protecting semiconductor circuitry, secondary circuits, and low voltage integrated circuits (ICs). They are also used in high voltage applications, with some types designed for use up to 72 kV. The specific application depends on the fuse's current, voltage, and breaking capacity ratings.
Advantages
One of the primary advantages of IEC 269-2 1 fuses is their reliability in protecting electrical circuits from overcurrent conditions. They provide a simple and effective means of isolating faulty circuits, thereby preventing damage to equipment and enhancing safety for personnel. Additionally, the availability of striker pins in some designs allows for remote monitoring and alarm initiation, adding an extra layer of safety and convenience.
Limitations
A significant limitation of IEC 269-2 1 fuses is that they must be manually replaced after they operate. This can lead to downtime in the circuit until the fuse is replaced. Furthermore, the selection of the correct fuse requires careful consideration of various parameters, including current rating, voltage rating, and let-through current, which can complicate the selection process.
Considerations
When selecting IEC 269-2 1 fuses, it is essential to consider the maximum continuous operating current of the circuit and the influence of ambient temperature on the fuse's performance. The voltage rating should be chosen based on the maximum effective operating voltage of the circuit, and the breaking capacity rating should be sufficient to handle the maximum possible fault current without causing destruction or maintaining an arc. Proper selection ensures reliable long-term performance and optimal protection for the application.
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Description: The following characteristics of fuses are specified in addition to IEC Publication 269-1: - minimum rated breaking capacities; - time-current characteristics; - I2t characteristics; - standard conditions of constructions; - power dissipation and acceptance.
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Supplier: RS Components, Ltd.
Description: Professional range of Cooper Bussmann industrial fuses designed to protect large industrial installations Bolted Tags Current Rating = 16A Fuse Size = A2 Fuse Standard = BS 88, IEC 269-1-2 Fixing Centres = 73mm Tag Width = 8.7mm Overall Length = 82.3mm Body
- Approvals / Standards: IEC (UMF) Approval
- Current Rating: 16 amps
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Supplier: RS Components, Ltd.
Description: /current characteristics (IEC 269). Low temperature rise, suitable for high density mounting applications. ASTA, BS88 and IEC269 certified Fuse Standard = BS 88, IEC 269-1 Fuse Type = HRC Fuse Size = F1 Current Rating = 2A
- Approvals / Standards: IEC (UMF) Approval
- Current Rating: 2 amps
- Voltage Rating: 550 volts
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Supplier: RS Components, Ltd.
Description: /current characteristics (IEC 269). Low temperature rise, suitable for high density mounting applications. ASTA, BS88 and IEC269 certified Fuse Standard = BS 88, IEC 269-1 Fuse Type = HRC Fuse Size = F1 Current Rating = 25A
- Approvals / Standards: IEC (UMF) Approval
- Current Rating: 25 amps
- Voltage Rating: 550 volts
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Supplier: RS Components, Ltd.
Description: /current characteristics (IEC 269). Low temperature rise, suitable for high density mounting applications. ASTA, BS88 and IEC269 certified Fuse Standard = BS 88, IEC 269-1 Fuse Type = HRC Fuse Size = F1 Current Rating = 4A Voltage
- Approvals / Standards: IEC (UMF) Approval
- Current Rating: 4 amps
- Voltage Rating: 550 volts
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Supplier: Rittal North America LLC
Description: 160 A NH construction size 00 Test specification IEC 60 947-3 IEC 60 269-2 (fuse inserts) Dimensions Width: 106 mm Height: 194 mm ( Width: 4.17 ? Height: 7.64 ? ) Connection for round conductor cross-sections 4
- Current Rating: 160 amps
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Supplier: UL Standards & Engagement
Description: assemblies and control methods used with trace heating systems. The explosive atmospheres referred to in this standard are those defined in IEC 60079-10-1 and IEC 60079-10-2. Annexes D and E outline the application of this standard for those users applying the Division
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Supplier: SCHURTER Inc
Description: Description IEC Approved For high current applications Max. ambient temperature 125 °C Impermeable to potting compound used to achieve hermetic seal for use in intrinsically safe applications according to ATEx and IECEx requirements
- Approvals / Standards: UL Approval, VDE Approval, IEC (UMF) Approval
- Current Rating: 15 amps
- Material: Ceramic
- Rated Breaking Capacity: 1000 amps
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Supplier: Littelfuse, Inc.
Description: 5x20mm fast-acting ceramic body cartridge fuse designed to IEC specification. Designed to International (IEC )Standards for use globally Meets the IEC 60127-2, sheet 1 specification for fast-acting fuses Available in cartridge or axial lead form
- Approvals / Standards: CSA Certification, VDE Approval, IEC (UMF) Approval, SEMKO Approval
- Features: Fast Acting
- Operating Temperature: -55 to 125 C
- Voltage Rating: 250 volts
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Supplier: DigiKey
Description: 160A AC 1.5kV DC Fuse Rectangular Bolt Mount
- Approvals / Standards: UL Approval, IEC (UMF) Approval
- Current Rating: 160 amps
- Fuse Type: Blade Type
- Mounting: Other
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Supplier: Altech Corp.
Description: NH fuses are typically used for power distribution applications and to protect large electrical devices such as motors, drives, etc. They are available in seven sizes with a current range of 2 to 1600 Amps. NH fuses have knife blades at both ends, which mount into Fuse
- Approvals / Standards: VDE Approval, IEC (UMF) Approval
- Current Rating: 80 amps
- Features: Fast Acting
- Fuse Type: Blade Type
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Supplier: Mersen
Description: R Class according to IEC 60269-4 and VDE 636-23 Very low I²t for improved semiconductor protection Ultra fast acting Current limiting Superior cycling capability Applications Protection of inverters, motor drives, UPS systems and similar 690V or less equipments.
- Approvals / Standards: UL Approval, CSA Certification, IEC (UMF) Approval
- Current Rating: 630 amps
- Material: Ceramic
- Mounting: Other
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Supplier: SOCOMEC
Description: Socomec industrial fuses protect installations and people against overcurrents for any low voltage electrical circuit. Advantages High level performances • High breaking capacity - 120 kA at 400/500 V, 80 kA at 690 V. • High short-circuit limitation capacity
- Approvals / Standards: IEC (UMF) Approval
- Current Rating: 315 amps
- Mounting: Replaceable (with holder or clips)
- Rated Breaking Capacity: 120000 amps
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ISA 12.23.01 - Electrical Apparatus for Use in Class I, Zone 1 Hazardous (Classified) Locations Type of Protection Encapsulation "m"
IEC 269 - 2 - 1 1987 Low voltage fuses : Part 2: .
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ISA S12.23.01 - Electrical Apparatus for Use in Class I, Zone 1 Hazardous (Classified) Locations Type of Protection - Encapsulation "m"
IEC 269 - 2 - 1 1987 Low voltage fuses : Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly used for industrial application) Section 1: Examples of types of standardized fuses for use by authorized persons .