Vacuum Interrupter (VI)

Product catalog summary

Features
VITZRO EM Vacuum Interrupter (V.I) is a critical component in medium-voltage vacuum circuit breakers (VCB). It ensures power supply continuity and interrupts current during overloads and short circuits, providing excellent arc-extinguishing capabilities. The product is certified for high performance and reliability, benefiting from over 25 years of vacuum technology development. It maintains a high-vacuum state through advanced manufacturing processes, ensuring mechanical strength and minimal contact damage.

Structure & Operating Principle
The V.I consists of a fixed lead, movable lead, contacts, arc shield, metal bellows, and a twist protection plate. It operates by generating a vacuum arc when contacts open, which is influenced by a magnetic field to diffuse the arc and prevent overheating. The arc is extinguished when the dielectric strength surpasses the power voltage, completing the interruption process.

Ratings
The document provides detailed electrical and mechanical ratings for various V.I models, including rated voltage, power frequency withstand voltage, lightning impulse withstand voltage, rated frequency, normal current, short circuit breaking current, and mechanical life. These specifications ensure the V.I's suitability for different applications and operational conditions.

Dimensions
The document includes precise dimensional data for various V.I models, ensuring compatibility with different systems and installations. This section provides measurements for components like maximum operation distance, overtravel, and contact force, which are critical for ensuring proper fit and function in electrical systems.

Catalog excerpts

B7 Vacuum Interrupters CONTENTS Features····················································································· B7-02 Structure & Operating Principle············································· B7-04 Ratings·······························

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Vacuum Interrupters VITZRO EM Vacuum Interrupter (V.I) is a core part that composes the breaking part of medium-voltage VCB. Generally, it is a satisfactory conductor to supply power and it promptly interrupts the current in case of an overload and short circuit faults to ensure the insulation. It is the most ideal, arc-extinguishing device. Certification It is a high-performing, highly reliable product and its electrical and mechanical cycle has improved. Its performance is optimized by applying the vacuum technology accumulated for more than 25 years. Through a single compression processing...

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Structure & Operating Principle Structure The basic structure of a general V.I is shown below and it consists of a fixed lead, a movable lead, contacts, an arc shield, metal bellows and twist protection plate. VITZRO EM V.I maintains a highly reliable, high-vacuum state due to the automation process and its internal pressure is 5×10-7 torr under. Movable Lead Twist Protection Plate Metal Bellows Ceramic Insulation Fixed Lead

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Vacuum Interrupters V.I Current Breaking Principle. Operating Principle When the contacts that were conducting current to the inner V.I are physically opened, a vacuum arc is generated between the contacts and this continues until the next zero current point. The arc under the influence of vacuum is affected by the magnetic field that is generated by contact structure and shape and it diffuses the arc to the next zero current point or drives to the random direction. That is, the first arc generated by the inductive magnetic field formed by the contact structure and shape forms a single contact...

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Vacuum Interrupter (V.I) is a core part that mainly composes the contact part of medium-voltage VCB and it is a product that requires reliability even at high-voltage current that is generated due to the overload and short circuit faults. VITZRO EM designs and manufactures V.I and uses a finealumina ceramic tube that has an excellent vacuum-sealed characteristic and a mechanical characteristic for the production of highly reliable V.I. Also, Cu-Cr contacts are adopted to improve the high-voltage insulation and breaking capability. Applied Range Additional insuation Power Frequency Withstand Voltage...

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