Hughes OVX series of vacuum interrupter circuit breaker series is designed and manufactured in Sweden. It is built for use on overhead distribution lines for recloser applications as an advanced Smart Grid building block.

OVX can be equipped with Hughes control units for a simple remote control or with Hughes recloser control unit to form a recloser/sectionalizer. 

The OVX series model range:

• For 6/12kV OVX120 model of vacuum circuit breaker equipped with 12kV bushings, built-in disconnector and voltage sensors on the load side.
• For 6/15kV OVX121 model of vacuum circuit breaker equipped with extra insulated 27kV bushings and with 1 or 2 sets of voltage sensors on feed and/or load side;
• For 22/27kV OVX240 model of vacuum circuit breaker equipped with 24kV bushings, built-in disconnector and voltage sensors on the load side.
• For 22/27kV OVX241 model of vacuum circuit breaker equipped with 27kV bushings and with 1 or 2 sets of voltage sensors on feed and/or load side;
• For 33/40kV OVX405 model of vacuum circuit breaker equipped with ABB VG10 2000A/20kA 40.5kV vacuum interrupter and voltage sensors on the load side;

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The OVX vacuum circuit breaker of the latest generation has the following advantages:

• Low maintenance. Hughes OVXs are built to remain in operation for more than 30 years without major maintenance due to the highest quality materials used in its construction. 
• Live tank construction (1). It completely eliminates the occurrence of internal arc faults and the risk of explosion or destruction inside the switch tank. That makes it repairable in case one of the poles is damaged. It provides improved cooling of the vacuum interrupters due to unhindered air circulation. It has the increased creepage distance that allows the use of the product in an environment with a 4th degree of atmospheric pollution and cleaning of insulation without dismantling;
• Solid epoxy insulation (2) of bushings and insulators. Silicon coating provides UV protection, is environmentally friendly, does not contain harmful SF6 gas or oil;
• Vacuum interrupter bottles (2) that can handle 20kA faults for 3s guarantee long term problem free operation in networks with many high current faults;
• Highest quality stainless steel (3) is used for most of the parts to minimize electrochemical corrosion. The use of stainless steel in accordance with DIN50049 / 3.1B, thanks to its non-magnetic properties, completely eliminates the occurrence of any kind of corrosion, including electrochemical corrosion over the entire life of the product;
• Spring stored energy operating mechanism (4). It provides turning On and Off the switch module even in the complete absence of power supply (voltage transformer malfunction, full battery discharge);
• Manual charging (5) of the spring mechanism as well as switch operation On and Off are possible with the help of maneuvering arms located on a switch body. The spring capacity is enough for the full reclosing cycle (Off - On - Off);
• Built in disconnector (6) (applicable for 120 and 240 models only) gives visible open points of all three phases for extra safety. The disconnector is synchronized with the vacuum interrupter and cannot be open or closed when the vacuum interrupter is closed;
   

THE OVX120 for 6/15kV / OVX240 for 22/27kV VACUUM CIRCUIT BREAKER COMPONENTS:

• 12kV / 24kV bushings (1) of epoxy with silicone surface;
• Integrated and synchronized disconnector (2) with visible open points on all 3-phases;
• Integrated 3x phase current transformers (3) with built-in voltage sensors on load side;
• High current vacuum breaker element (1), AMF type for 630 or 1250A continuous line load and 20kA fault current in 3 sec
• Attachment points (6) for down pole mounted disconnector operation handle;
• Frame (7) made of 5 and 4mm stainless steel to eliminate electrochemical corrosion;
• Electrical circuit (8) made of high grade copper;
• Manual maneuvering (9) of both vacuum interrupter and disconnector;

Optional components:

• Integrated 1x core balance CT (4) for detecting low earth faults;

The OVX405 for 33/40kV vacuum circuit breaker components:

• ABB VG10 2000A/20kA 40.5kV vacuum interrupter (1);
• Integrated 3x phase current transformers (2);
• Integrated voltage sensors (3) on load side;
• High current vacuum breaker element (1), RMF type for 1200 A continuous line load and 16 kA fault current in 3 sec
• Frame (4) made of 5 and 4mm stainless steel to eliminate electrochemical corrosion;
• Electrical circuit (5) made of high grade copper;
• IP67 Control cable contact (6);
• Manual maneuvering (7) of vacuum interrupter;
• Spring stored energy operating mechanism (8);

The OVX120/121/240/241/405 models of vacuum circuit breaker can be installed on one wooden or concrete pole.

The standard installation includes below elements in the following sequence:

• Voltage transformer (1)
• Vacuum circuit breaker (2)
• Interconnecting cable (3)
• Recloser control cabinet (4)