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Power Fuse

Product catalog summary

Features
The document highlights the features of current limiting power fuses, focusing on their high breaking capacity, compact size, and enhanced safety. These fuses are suitable for both indoor and outdoor applications, with standardized dimensions for easy maintenance and compatibility. They are noted for their superior quality and short circuit capability, adhering to international standards.

Configuration
Fuses are available in various configurations, including 3.6/7.2kV and 24/25.8kV ratings, with different current capacities. They are designed for use with vacuum contactor switches and load break switches, providing protection for various electrical circuits.

Application
These fuses are used in transformer circuits, capacitor circuits, motor circuits, and for backup protection of circuit breakers and switches. They are designed to minimize mechanical and thermal damage in electrical systems by quickly interrupting fault currents.

Ratings
The document provides detailed ratings for the fuses, including maximum and minimum breaking currents, time-current characteristics, and external dimensions. The fuses are designed to deliver maximum operating energy and ensure reliable tripping of load break switches.

Fuse Selecting Conditions & Criteria
Selection criteria include operating location, rated voltage, current, and breaking capacity. The document outlines specific conditions for selecting fuses based on different circuit types, such as transformers, motors, and capacitors, ensuring proper coordination with load circuits and protectors.

Fuse Link Structure
The structure of the fuse links is detailed, highlighting their design for optimal performance and energy delivery. The document specifies the dimensions and weight of various fuse models.

Characteristics Curves
The document includes tables and curves illustrating the time-current characteristics and breaking capacities of the fuses, aiding in the selection process for specific applications.

Dimensions
Dimensions for different fuse models are provided, ensuring compatibility with existing systems and ease of installation.

Specifications
The document provides a range of voltage and current specifications for various VTHF models, including detailed voltage ranges and corresponding model numbers. Specifications also cover current ranges for different models.

Procedures
1. The inrush current of a capacitor is assumed to be 71 times the rated current for 0.002 seconds.
2. The rated current of a fuse is selected to continuously conduct 1.5 times the capacitor's rated current.

Fuse Selection
The document outlines the selection of power fuses for wire protection, detailing the wire size in square millimeters and the corresponding applied fuse link.

Fuse Link Structure
The general structure of a fuse link includes a coiled fuse element fixed by spot welding at both ends, buried in silica for excellent current limit characteristics. A high-resistant pilot wire improves conductivity and breaking capability.

Striker Characteristics
The striker's operating load is increased to check the fuse's operating state, maximizing deliverable energy and supporting force. The operating time is minimized to enhance electrical signal and mechanical interlock functions.

Operating Characteristic Curves
The document includes time-current characteristics for different voltage levels, detailing the cut-off characteristics and time-current curves.

Dimensions
External dimensions for fuse holders are provided for different voltage levels, with details on external diameter and length.

Fuse Mounting Index
The document provides a mounting index for different holder types, including rated voltage, current, circuit voltage, and impulse withstand voltage. Dimensions for applied fuse links are also detailed.

Catalog excerpts

B6 Current Limiting Power Fuses CONTENTS Features····················································································· B6-02 Configuration············································································· B6-04 Application ················································································ B6-06 Ratings······················································································· B6-08 Fuse Selecting Conditions & Cri

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Current Limiting Power Fuses VITZRO EM Current Limiting Power Fuse passed the development test carried out by an official authentication organization and it is recognized for its superior quality and short circuit capability. It is an advanced product designed by applying the accumulated technology and experiences in the field It ensured the maximum breaking capacity within the same rating It is possible to provide various fuse ratings due to the development of 7.2kV 50kA and 10A~200A, 24/25.8kV 40kA and 1A 160A With to the development of 25.8kV Class current limiting, it can be used at local...

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Configuration Fuse Link Fuse Holder Diameter : Rated Current : Vacuum Contactor Switch VCS • 3.6/7.2kV • 50kA • Indoor Type Load Break Switch LBS • 24kV 40kA 630A • Electric Type

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Current Limiting Power Fuses Fuse Link Fuse Holder Current Limiting Power Fuses Diameter : Rated Current : VITZRO EM Current Limiting Power Fuse interrupts the short circuit current within the shortest time through the current limitation that prevents the short circuit current generated by the resistance within the fuse from reaching the crest value when much short circuit current flows. It is a protection device to minimize the mechanical and thermal damages that are generated in the switch and control system circuits.

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Application Accessories • For the transformer circuit - To interrupt the fault current of transformer secondary short circuit & transformer circuit • For the Capacitor circuit - To interrupt the fault current of Capacitor circuit • For the back-up protection of circuit breakers & switches - For the back-up protection if the breaking capacity of CB and Switches is not enough • For the cable circuit - To protect the cable by interrupting the fault current of circuit • or the motor circuit - To interrupt the fault current of circuit where much over-current F flows when the motor starts and to protect...

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Current Limiting Power Fuses Table on Main Characteristics About 4 ~ 5 times the rated current, fuse has expanded the protection area Rated Current Development tests on all ratings ranging from minimum 1A up to 200A completed Current Limiting Characteristic Sharp decrease in the crest value of fault current in case of a fuse short circuit fault due to the excellent current-limiting characteristic Time-Current Characteristics External Dimensions Easy to select within the maximum error range of ±10% Fuse Link Length Fuse Link Diameter Energy Delivery Delivers the maximum operating energy among...

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Ratings Striker 3.6/7.2kV Fuse Link Ratings Rated Max. Breaking Current [kA] Rated Min. Breaking Current [A] Rated Voltage Rated Max. Breaking Current ※For both indoors and outdoors ※For indoors ※How to order : Refer to the following product type and order type Order Information Rated Current : Refer to the table of rating specification Fuse Link Fuse Link * Striker (Fuse Checker) is optional. Diameter of Removable Hook 5 6

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Current Limiting Power Fuses 24/25.8kV Fuse Link Ratings Rated Max. Breaking Current [kA] Rated Min. Breaking Current [A] External Dimensions Rated Voltage Rated Max. Breaking Current ※When applying VTHF24200, please contact our company. Current Limiting Power Fuses

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Power Fuse

Power Fuse

Catalog excerpts

All VitzroEM Co., Ltd. catalogs and technical brochures