Indoor vacuum
circuit breaker

The VX4 series of kiosk/substation vacuum circuit breaker is intended to be used in transformer substations and switching points. It has a wide range of accessories as truck’s, different types of connection arms and contacts, commissioned with or without integrated current transformers. The VX4 circuit breaker series includes the models for the voltage range 6/12kV and 22/24kV and is built to remain in operation for more than 30 years without major maintenance.

Hughes Power System indoor vacuum circuit breaker
  • Non enclosed switch for extra safety
  • Small foot print
  • Operation On and Off with full load without electric power
  • Solid insulated. No harmful SF6 gas
  • Frame of "Marine grade" premium stainless steel
  • Epoxy bushings with silicon insulation


Hughes VX4-24 series of kiosk vacuum circuit breaker is designed for use on underground distribution lines with the voltage range 22-24kV, in distribution substation applications and as an advanced Smart Grid building block.

The VX4-24 series of kiosk vacuum circuit breaker model range:

  • VX4-24 model of vacuum circuit breaker is equipped with 24kV bushings;

download catalogue

send enquiry

Hughes Power System substation vacuum circuit breaker module 24kV


The VX4-24 vacuum circuit breaker components

  • 24kV bushings (1) of epoxy, no SF6 gas or oil;
  • High current vacuum breaker element (1), AMF type for 630 or 1250A continuous line load and 25kA fault current in 3 sec;
  • Frame (2) made of 5 and 4mm stainless steel to eliminate electrochemical corrosion;
  • Electrical circuit (3) made of high grade copper;
  • Manual or remote maneuvering (4);
  • Padlock facility (5) for mechanical blocking of operation;

Optional components:

  • Integrated 3x phase current transformers (6);
  • Clip-on current transformers and a core balance transformer for low earth faults detecting (cable mount);
Hughes vacuum circuit breaker


Hughes vacuum circuit breaker



  • Hand crank operated truck mount (1) with interlock function;
  • New! Grounding system cable theft alarm (2). See details here;
  • Clip-on current transformer, winding: 150/1;
  • Core balance transformer (3), winding: 20/1;
  • Voltage transformer (4) 1-phase connection 12 or 24/.110 kV class1, 50 VA;

Complete list of external accessories is here.

Hughes vacuum circuit breaker


VXR installation in a substation breaker bay. 

  • Left: inner protection door closed. Circuit breaker operation buttons (1) extender is mounted on the door;
  • Right: VXR (2) installed in a mounting frame (3). Upper side connected to a disconnector (4) with visual open points. Lower side connected to an outgoing cable (5);
Hughes vacuum circuit breaker


Description vx4-12 vx4-24  
Rated operation voltage, VDC 24-48-110 24-48-110  
Rated maximum voltage, kV 12 24  
Rated basic impulse level, kV 95 125  
Rated power, W 40 40  
Rated continuous current, A 630/1250 630/1250  
Rated fault making current, kA 63 63  
Rated fault breaking current, kA 25 25  
Cable charging current, A 20 40  
Line charging current, A 5 10  
Rated fault duration time, s 3 3  
Contact resistance, VCB, µΩ < 35 < 35  
Network frequency, Hz 50/60 50/60  
Description Winding 1 Winding 2 Winding 3
Phase CT clip-on type 150/1    
Phase CT type 1 200/1 400/1 600/1
Core balance CT  20/1    
Design min mechanical/electrical 20.000 20.000  
Dimensions (LxWxH), mm 460x447x537 587x829x643  
Weight, kg 75 95  
Operating temperature, °C -45 - +70 -45 - +70  
Humidity 100% at 25 C 100% at 25 C  
Enclosure IP55-65, non-magnetic stainless steel, optional painted in RAL or ANSI colour
Bushing type Epoxy core
Phase to phase distance, mm 150 210  
Max installation altitude at rated BIL, m 3000 3000  
Design specification IEC 62271-100
Marking specification IEEE std C37.60
Operation sequence, no charge 25 ms trip - 50 ms close - 25 ms trip

How can we help?

Thank you for contacting us. Your message has been sent. Our representative will reply to you as soon as posible.

If you are an existing customer and have an urgent need for technical support, please contact your local customer services manager. If you are not sure who that is, please use contact details. You can send a message to us directly by using the form below.

Motor drives for disconnectors
  • Motor drives for disconnectors
  • Disconnectors for railways
  • Reclosers
  • Recloser controls
  • Time-voltage sectionalizers
  • Kiosk reclosers
  • Indoor vacuum circuit breaker
  • Outdoor vacuum circuit breaker
  • Vacuum load break switches
  • Сontrol units for vacuum circuit breakers
  • High voltage circuit breaker