The high-voltage load break switch (HV LBS) is a switching device designed to open or close a high-voltage circuit under stable voltage and current conditions.
Visible Gap in Open Position:
When the switch is in the open position, there must be a clear, visible gap. A series disconnect switch is not necessary. During maintenance of electrical equipment, simply disconnecting the high-voltage load switch is sufficient.
Ability to Withstand Interruptions:
The load break switch must be capable of handling the specified number of interruptions during operation.
Ability to Close Short-Circuit Current:
While the high-voltage load switch is not required to interrupt short-circuit currents, it must be able to close under short-circuit conditions.
The high-voltage load break switch operates in conjunction with a current-limiting fuse. It functions primarily to make and break load currents, similar to a circuit breaker. The fuse, however, is responsible for interrupting excessive overload and short-circuit currents. Thus, the load break switch handles normal operational currents, while the fuse provides protection against overcurrent conditions.