High-Voltage Load Switches vs Isolation Switches
2025-04-02 13:13:35

High-voltage Load switches can handle load currents and have self - arc extinction, but their breaking capacity is limited. They're often used with Fuses for protection. In contrast, high - voltage isolation switches usually can't handle load currents as they lack an arc - extinguishing device. Their main role is to provide a visible break in the circuit for safety during maintenance. Both are crucial in electrical safety equipment systems, but their distinct capabilities make them suitable for different applications in high - voltage electrical setups.

Comparing dimensions	High voltage load switch	High voltage isolation switch
Arc extinguishing capability	Built in vacuum/SF6 arc extinguishing chamber, capable of cutting off rated load current (≤ 630A)	No dedicated arc extinguishing device, only allows breaking of ≤ 0.5A capacitor current
Protection function	Often combined with current limiting fuses (such as ABBSACE series) to achieve fast breaking of short-circuit current	No protective function, needs to be used in conjunction with a circuit breaker
Breaking ability	Rated current breaking (such as 12kV/1250A), but cannot cut off short-circuit current	Does not have current breaking capability, only provides visible electrical isolation
Mechanical lifespan	Operation times ≥ 5000 times (IEC62271-103 standard)	Operation frequency 210000 times (IEC62271-102 standard)
Typical applications	Ring main unit, box type substation (such as Schneider RM6)	Substation busbar segmentation (such as 110kV GIS isolation switch)