GEK-49950
Example:
The two amp (2A) tap for a 1-to-1 2 I FC95 time-overcu rrent rel ay requ i res one m ovable
l ead i n p osition C and the other i n p osition L.
The I FC rel ays should op erate at the times show n i n the publ ish ed tim e cu rve w ith i n
±
7%
or plus or m i nu s th e tim e-d i al setting times 0.01 0 second (
±
Setting x 0.01 0 sec.),
wh ich ever is g reater.
5 and 6 show the various tim e-cu rrent cha ract eristics for the
I FC rel ays. The setting
the time dial determines the length of th e time requ i red to .close
the contacts for a g iven cu rrent. The h igher the time-dial setting the l onger the ope rating
tim e.
The contacts are just closed when the time dial is set to z ero (0). The m ax imum tim e
setting occu rs when the time-d ial i s set to 1 0 and the disk h as to travel its m ax imum
d istance t o close the contacts.
Reset
The u n it resets at 90% of the m i n imum closi ng cu rrent. Reset times a re p roportionate to
the tim e-dial settings. The time requ i red to reset to the number 1 0 tim e- d i al p osition
when the cu rrent is reduced to zero (0) is app rox imately fou r seconds (4 sec.) for the I FC95
rel ays.
H IGH-SE ISM IC IN ST ANTANEOUS UN IT
The i nstantaneou s u n it h as a 25-to-1
w ith a tapped coil. There a re h i gh and l ow
ran ges, selected by means of a l i nk
on the top of the suppo rt stru ctu re (see Figu re
1). The tim e-cu rrent curve for the i nstantaneous u nit is show n i n Figu re 9.
H IGH-SE ISMIC T ARGET AND SEAL-IN UN IT
The target and seal-in u n it h as two tap sel ections, l ocated on the front of the u n it (see
Figu re 1).
RECEIVING, HANDLING, AND STORAGE
These relays, when not included as a p a rt of a control panel, w ill b e sh ipped i n cartons
designed to p rotect them against damage. Immediatel y upon receipt of a rel ay, exam i ne
it for any d am ag e sustai ned i n transit. I f dam age resulting from rough h a ndl i n g is evi dent,
file a d am age cla im at once w ith the transp o rtation company a nd p romptl y notify the
nearest G eneral Electric Sal es Office.
Reasonable care sh ould b e exercised i n u npack ing the relay to p revent damage to its p a rts
or distu rb i ng of the adjustments.
I f the relays are not to be i nstalled immed iately, they should b e stored i n the i r ori g i n al
cartons i n a place that is free from moistu re, dust and m etall ic chips. Fore i g n m att e r
collected on the outside may find its w ay i nside when the cover i s rem oved and cause
trouble in the operation of th e rel ay.
9
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