Switch with pre-alarm means

Details Switch with pre-alarm means Switch with pre-alarm means

1992-05-29

1994-02-01

Hofsass, Jeffrey

Communications: electrical

Condition responsive indicating system

Specific condition

340638, 340657, 335 17, G08B 2100

Patent

active

052835537

ABSTRACT:
In a switch with pre-alarm means having level adjusting apparatus (105a) of the pre-alarming and an indicator (103) for showing that value of current flowing on a load corresponds to the pre-alarm level, the level adjusting apparatus (105a) is adjusted with monitoring the indicator (103). When the indicator (103) is lighted, the value shown by level indicator (105b) of the level adjusting apparatus (105a) corresponds to actual value of the current flowing on the load at that time.

REFERENCES:
patent: 3761776 (1973-09-01), Willard
patent: 3809985 (1974-05-01), Krause et al.
patent: 4335437 (1982-06-01), Wilson et al.
patent: 4698621 (1987-10-01), Masot
patent: 4768025 (1988-08-01), Vila-Masot

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