Switch with pre-alarms means

Details Switch with pre-alarms means Switch with pre-alarms means

1991-05-03

1991-12-31

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, 340661, H02H 393

Patent

active

050776290

ABSTRACT:
In a switch with pre-alarm means (101) having pre-alarming apparatus (20, 21) and an indicator (103) for alarming that value of current flowing on a load is above a predetermined alarming level, output of the pre-alarming apparatus is held at a predetermined level after the value of the current once becomes above the alarming level by self-holding function of thyristor (CR) even when the value of the current becomes below the alarming level after that.

REFERENCES:
patent: 3775675 (1977-11-01), Freeze et al.
patent: 4210906 (1980-07-01), Smith et al.
patent: 4335437 (1982-06-01), Wilson et al.
patent: 4414601 (1983-11-01), Conroy
patent: 4860153 (1989-08-01), Ishii
European Search Report, dated Jun. 15, 1990.

Affiliated with

Also associated with

Rating

Switch with pre-alarms means does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Switch with pre-alarms means, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switch with pre-alarms means will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1513896