Medium Voltage Switches, Breakers, and Contactors

Since introducing SF6 gas rotary-arc technology in 1964, Yaskawa has produced over 120,000 medium-voltage SF6 switches, circuit breakers, and contactors. Yaskawa introduced the world's first medium voltage circuit breaker with SF6 gas rotary-arc technology to the market in 1970, and has led the technological development for this class of switch worldwide.

MV Load Break Switch

Yaskawa's SF6 load break switches are safer to operate than vacuum and other competitive types because the gas pressure is continuously monitored by a pressure switch and is mechanically and electrically interlocked if pressure is lowered. Highest quality porcelain bushings are used for longer and more reliable insulation performance, thus making the Yaskawa switch ideal for use in hostile and dusty environments such as mines, heavy salt-ridden coastal areas, and dense tropical areas.

Capacitor Switch

Yaskawa's rotary-arc switching technology in SF6 gas provides the optimum results to prevent abnormal switching surge voltages with the absolute best performance when switching capacitor banks than any existing switching equipment in the field. This smooth switching technology provides superior "making" performance for high inrush and frequency current, in addition to the "re–strike" free performance for either closing or interrupting operations.

Pole Mount

This motorized spring stored energy mechanism is adopted for high-speed automatic operation. The closing time is less than 1.5 seconds after sending the signal from a control unit. Tripping time is less than 100ms after sending the signal from the control unit. The closing spring is charged by a motor and discharged instantaneously. This mechanism can be operated by battery (24VDC) for emergency when the usual power supply is disconnected. The control unit supplied by Yaskawa can be used for local operation and has a provision for RTU and radio communication for remote control.

Pad Mount

Yaskawa's SF6 load break pad mount switches offer a compact design utilizing the quenching and insulation performance of SF6 gas with rotary-arc technology. A front bushing (dead break elbow) configuration allows for easy connection. Motorized spring stored energy operation drive is accomplished by supply line and battery.

Submersible

Yaskawa's SF6 load break submersible switches are water–tight structures suitable for vault installation (water submersed for one week). The compact size is due to SF6 rotary-arc technology. Power cable connections are located in the front side of the switch providing front access and space savings. For safety, a grounding switch is connected to all phases to prevent short-circuits. Remote / Local operation can be accomplished with a water-tight, compact Yaskawa controller.