The three-position switch is a versatile integration of main switch, earthing switch, and disconnector, which are sealed in a strengthened epoxy resin casing filled with 0.045MPa SF6 gas in the interior as quenching and insulating medium. Our load break switch achieves these three functions with a minimum of components, boasting good quality and reliability.

The load break switch is maintenance-free, and under normal conditions, it can be in smooth operation for more than 20 years. Switching operation is performed by an independent manual or electric operating mechanism. If equipped with microcomputer monitoring device, the electric operating mechanism may allow remote measurement, remote sensing and remote control, to provide necessary conditions for distribution automation.

A specially designed pressure relief channel (anti-gas explosion film) is set behind the sealed chamber. When arc fault occurs in the chamber, the high temperature and high pressure gas will be discharged through the relief passage to ensure the safety of personnel and other equipment. Reliable interlock device precludes operators’ misuse. The load break switch can be used together with a current limiting fuse to form a modular unit, which can effectively protect the lower end electrical equipment (such as transformers, etc.).

Applications
The load break switch is suitable for three-phase AC 50Hz, 12kV power system, as the RMU switching device forindustrial and mining enterprises, high-rise buildings, residential quarters, or prefabricatedsubstations and other places. The function is to control load current, or to control off-load transformers and capacitor groups. The unit of load break switch and fuse can be an alternative to circuit breaker, and in this case, the load switch is the load current controller, while the fuse breaks large overload current and short-circuit current.

Main applicable areas: large shopping malls, industrial and mining enterprises, urban residential areas, switching stations, airports, subways, stadiums, hospitals, small secondary substations and other places.

Service Conditions
Altitude: 1000 meters;
Ambient temperature: -10℃~ 40℃;
Ambient relative humidity: daily average at 95%, monthly average at 90%;
Ambient air has no obvious dust, smoke, corrosive or flammable gas, vapor or salt contamination;
No frequent severe vibration;
Earthquake intensity does not exceed 8 degrees.

Note: For use in different conditions or other requirements, please consult with us.

Notes: spring mechanism is available in A, K types: K-single spring (fuse cannot be fitted); A-double spring (can be equipped with fuses); A, K types may choose electric operation.

FIN Series SF6 Load Break Switch Standard Compliance
3.6-40.5 load switch
AC high voltage load switch fuse combination
Common specification for high voltage switchgear and control gear standards
High voltage AC disconnectors and earthing switches
~ 40.5kV high voltage AC load switch, AC high voltage load switch fuse combination
Common specification for high voltage switchgear and control gear standards
High voltage AC disconnectors and earthing switches

Mechanism Instructions
Main switch and earthing switch status indication, blown fuse indication (trip: shunt trip)

Motor Selection
AC220V, DC220V
DC48, DC24V
A type Operation Mechanism
K type Operation Mechanism

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