It is a multi-circuit breaker for underground to minimize the breakdown and power outages by installing at the trunk line,branch and customer entry point of 22.9kV underground lines.

It is a maintenance-free structure that does not require inspection for gas leakage and replenishment due to the phase-separated solid insulation and vacuum blocking method,and due to the excellent insulation performance of epoxy,it can be applied not only to general areas but also to areas that are damaged by salt.

As an operation method,a magnetic actuator with minimal parts is used to ensure long life,and the insulation performance is reinforced by applying a vegetable oil insulated contact method instead of the conventional vacuum cut-off part for the ground part.

The control part includes a directional relay element to prevent malfunction due to reverse fault current in the case of a breakdown on the power side of the circuit breaker in the line connected to distributed power sources such as solar,wind,and small power generation.

responsibility

-Main circuit vacuum cutoff method

-Completely solving the problem of ground switch failure through vegetable insulating oil

-Magnetic actuator operation method minimizes parts to ensure long life

-20 years use reliability certification (KERI)

safety

-Three-phase short circuit accident is prevented by separating the insulating housing for each phase.

-Resolve the risk of explosion due to pressure expansion in the SF6 gas insulation method

Environmentally friendly epoxy insulation

-Can be applied to damaged areas due to the use of epoxy resistant to contaminated environments

-Maintenance-free structure that does not require gas and pressure release locking device [Maintenance Free]

-Environmentally friendly with no use of SF6 gas with a warming factor of 23,900 times that of CO2

Other technical notes

-Prevents reverse fault blocking through directional determination algorithm

-Reverse current monitoring and prevention of input when live on the load side

-Completely waterproof structure with IPX8 grade

-FRTU integrated digital control

-Small and lightweight structure reduces installation space