Circuit breaker with digital solid-state trip unit with optional functions
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United States of America Patent
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-
Sep 15, 1987
Grant Date -
N/A
app pub date -
Feb 10, 1986
filing date -
Feb 25, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Digital solid-state trip unit designed to provide protection against phase faults, notably overloads and short-circuits and optional functions, in this case ground fault protection and load shedding and restoring functions. Two parameter input switches (72, 74) are assigned to the optional functions to display, in the ground protection option the ground protection pick-up and the ground protection time delay, and in the load shedding option, the load restoring pick-up and the load shedding pick-up. Each option has a software program stored in a non-volatile memory corresponding to it.
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