VHOS-40.5/T2000-31.5 型戶內高壓真空斷路器 ( 以下簡稱斷路器 )，適用于三相交流 50Hz, 額定電壓 40.5kV 電力系統中，可供工礦企業、發電廠及變電站作為分合負荷電流、過載電流、故障電流之用。

斷路器與操作機構采用上下布置結構，有效地降低了斷路器的深度。

三相滅弧室和相聯帶電體由三只獨立的環氧樹脂絕緣筒相隔離，構成復合絕緣結構，斷路器滿足正常運行條件下的空氣距和爬電距要求，并有效地減小了斷路器的體積。主導電回路真空滅弧室和動靜導電聯接安裝在絕緣筒內，使相間距僅為 300mm。主回路電氣連接全部采用固定式連接，具有很高的可靠性。絕緣筒安裝在斷路器框架上方。

為這種新斷路器專門設計的彈簧操動機構，安裝在斷路器框架內 , 其結構特點更適合真空斷路器上下布置形式 , 關成為斷路器整體結構中不可分割的一部分。機構設計簡單，輸出曲線更適合 40.5kV 真空斷路器的特點和要求。

總體布局合理、美觀、簡潔。體積小巧、操作靈活，具有電氣性能可靠、使用壽命長、檢修方便、機構免維護的特點。

該斷路器適用頻繁操作及多種場合和運行條件比較苛刻的場所。

VHOS-40.5/T2000-31.5 type indoor high voltage Vacuum circuit breaker (below said as VCB), is suitable for power system with 3-phaseAC 50HZ, rated voltage 40.5kV, it can be used as load current, overload current and fault current for mining enterprises, power plant and substation.

The breaker and the operation structure is upper and lower layout, reduced the depth effectively.

3-phase interrupter and associated live parts are isolated by three independent isolated epoxy insulating tube, act as the composite insulation structure. This VCB can meet the requirement of air distance and creepage distance, and reduce the size of the VCB effectively. 

Leading electric circuit interrupter, static and dynamic conductive connection install in the insulating tube which let the distance between the phase is only 300mm. All the leading electric circuit is fixed type, which makes the connection very stably. Insulating tube install on the upside of the frame.

The spring actuator specially designed for this type of new VCB, install inside of the frame, which is more suitable for the upper and lower structure, as an inseparable part of the VCB. The design of the VCB is simple, output curve is more suitable for the features and requirements f the 40.5kV VCB.

Overall layout is reasonable, beautiful, simple, with features as smaller volume, flexible operation, reliable characteristics, long endurance life, easier inspection, free of maintenance, etc. 

It is suitable for frequently operation, suitable for the places in very poor condition.