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FUJI VCB, VMC, Protection Relays

H.V. Vacuum circuit breakers, Vacuum magnetic contactors, Protective relays

Vacuum circuit breakers

Vacuum circuit breakers are compact circuit breakers designed for safe operation, high reliability and easy maintenance, and are widely used for various types of high voltage circuits.

FUJI V-circuit breakers (VCB) have been developed through the use of our many years of successful experience and advanced technology. They are compact and light-weight, and are available in a number of current ratings.


New-Auto.V

The New-Auto.V is a circuit breaker that consists of a standard MULTI.VCB provided with a CT (current transformer), and incorporates a multiple function protectors and controllers to prevent equipment from overcurrent and other factors, thus saving energy and reducing installation man-hour.

Multiple function protectors and controllers offers versatile features such as ground-fault directional, ground-fault overvoltage, undervoltage, and overvoltage protective functions in addition to overcurrent protection. It also includes measurement functions for a variety of items, such as current, voltage, power, power-factor, frequency, and zero-phase voltage values.

Multi VCB

7.2/3.6kV, 400A, 600A, 8kA, 12.5kA The new Multi-VCB series of generalpurpose vacuum circuit breakers are based on the conventional HA series and feature improved safety and ease of use. With 2300mm high switchgear cubicles they can be stacked up to four high with consequent saving of installation space. Multi VCBs are available in different mounting version such as the fixed type (B, C, P) and draw-out type (X, Y, U).

Feature

Vacuum circuit breakers

HS series
  • These types are available in all ratings from 3.6 to 36kV, and can be applied to a variety of H.V. switchgear. The motorspring stored-energy types feature autoreclosing.
  • The HS types are comparatively high in breaking current with ratings of over 7.2kV, 20kA.
  • Breaking currents: 12.5kA to 50kA
  • Rated voltage: 3.6kV to 36kV
  • Standards: JEC, IEC
Auto. V

Auto. Vs are provided with a built-in electronic overcurrent relay and toroidaltype CT.

They require little space for installation and also facilitate the system wide protective coordination. The inverse-time operating and instantaneous trip currents can be set by means of the dial.

  • Breaking currents: 8kA, 12.5kA
  • Rated voltage: 3.6/7.2kV
  • Standards: JIS C4603
Features
  • Built-in solid-state OCR and CT are provided
  • System protective coordination is easily arranged using the VCBs.
  • Compactly assembled, so saving space
  • The built-in CT has a large overcurrent withstand value of 12.5kA.
  • The setting range of the rated current is 24A to 320A.
  • Applicable to the receiving and distribution facilities of 6kV, 170 to 2000kVA.
Multi VCB

The Multi VCBs are general purpose VCBs which are small in size and simple in construction thus allowing them to be applied to many types of switchgear.

  • Breaking currents: 8kA, 12.5kA
  • Rated voltage: 3.6/7.2kV
  • Standards: JIS C4603


Applications

Vacuum circuit breakers

HS series/Applications

Application guide of surge absorber When VCBs are interrupted especially under specific overlapping conditions, chopping surges or surges due to multiple restrikes will cause an escalating effect.

It is therefore recommended that surge absorbers and arresters are fitted to protect motors or transformers.

Notes: ● : Suppression device required – : Suppression device not required
*1 The withstand voltages (impulse) of transformer must exceed the values listed above.
*2 When breaking a magnetizing inrush current , it is recommended that a suppression device will be used.
*3 Semiconductor device must be provided with suitable suppression devices when a semiconductor is installed on the load side of transformer.

Vacuum condition tester/VC-1A

It is recommended that a withstand voltage tester (type VC-1A, sold separately) is used to check the state of the vacuum within the vacuum interrupter. The method of testing is very simple. First, withdraw the VCB from its enclosure set at the OFF position and switch the control circuit to the isolation position. Then earth the VCB together with the VC-1A tester and apply a test voltage. In this case apply 22kV (if the VCB's rated voltage is 7.2kV) between the poles of the vacuum interrupter for one minute. Under these conditions if the vacuum is normal a continuous buzzer signal will be given during the period the test voltage is applied.

On the other hand an intermittent buzzer sound will be given if the vacuum is unserviceable. Replace with a new interrupter if necessary.


Specification

Vacuum circuit breakers

HS series/General information


Auto.V series/Specifications


Multi VCM series/Specifications


Download

Description PDF File
FUJI VCB, VMC, Protection Relays Catalog