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The Type IF C95AD relay is an extended-range, sing le-phase, time overcu rrent rel ay h av i n g
a short i nverse-ti me ch a racteristic. T h e IF C95 B D i s s i m i l a r ex cept that it a lso i n cl ud es a
h i nged-a rmatu re i n sta nta neous- overcu rrent u n it. B oth the ti me-overcu rrent u n it a n d the
i n sta nta neous-overcu rrent u n it a re describ ed i n deta il i n the section on CON STRU CTI ON.
B oth rel ays a re eq u i pped w ith a d u a l - rated ta rget and seal - i n u n it.
I n addition to the co ntacts that a re norma l l y provided fo r tri ppi n g, each of the rel ays is
p rovided w ith contacts that may b e used for a l arm, remote i nd icatio n, o r othe r p u rp oses
d eemed suitabl e by t he user. N ote that the co ntacts associated w ith the ta rg et a nd sea l - i n
u n it w ill operate onl y after t h e ti me-overcu rrent- u nit contacts cl ose t o d raw trip cu rrent,
a n d hence a re not rel iabl e fo r use as tri p p i n g contacts. F or the ex a ct contact a rran gement
used in each of the rel ays, see F ig u res 3 and 4 (i nterna l -con nections for IF C95 A D and
IFC95 B D, respective l y) and F ig u re 7 (typi cal extern a l con nections fo r b oth rel a ys).
T he rel ays a re mou nted i n a siz e C 1 d rawout case of molded constructio n. T he outl i n e a n d
p a n e l d ril l i n g a re show n i n F ig u res 1 5 and 16.
W he n sem ifl ush mou nted on a su itab l e panel, these rel ays h ave a h i g h seismic cap ab i l ity,
Al so, th ese rel ays a re reco g n i z ed u nd e r t h e C o mp o n e nts P rog r a m o f
U nd e rw riters L ab o rato ries, I nc.
T he T ype IF C95 AD a n d IF C95 B D rel ays a re d esig ned for a p p l icati on w he re a fast i nve rse
time cha ract e ristic i n comb i nation w ith a rel ativel y low b u rd en is req u i re d. A typ i cal
appl icatio n is ill ustrated b y F ig u re 7, w here the rel ay is used to p rovid e sensitive gr o u nd
fa u lt p rotection for eq u i pment "dow nstrea m" from a g rou nded tra nsformer.
The I FC i nd ucti on-d isk r ela ys cons ist of a m old ed cas e, cov er, s u p port str uct ur e as sembly,
a n d a con nection pl ug to mak e u p the el ectrical con nection. See cover fig u re and F ig u res
1 , 2 and 14. F ig u re 2 shows the i nd ication u n it mou nted to the mol d ed su p po rt struct u re.
Th is d i sk is activated b y a cu rrent operating coil mou nted on a l a m i n ated U -mag ne t. T he
d i sk and shaft assembl y ca rries a moving contact that com pl etes the al a rm o r trip ci rcu it
w hen it touches a statio n a ry contact. The d isk assembl y is restrai ned b y a spi ral spri n g to
g ive the proper contact-cl osi ng cu rrent. The d i sk' s rot ation is retarded by a permanent
mag net in a mol d ed housi n g on the support structu re.
These instructions do not purport to cover all details or variations in equipment nor provide for every
possible contingency to be met in connection with installation, operation or maintenance.
information be desired or should particular problems arise which are not covered sufficiently for the
purchaser's purposes, the matter should be revered to the General Electric Company.
To the extent required the products described herein meet applicable ANSI, IEEE and NEMA standards;
but no such assurance is given with respect to local codes and ordinances because they vary greatly.
GEK-49950
TIME OVERCURRENT RELAYS
TYPES IFC95AD AND •fC95BD
DESCRIPTION
APPLICATION
CONSTRUCTION
3
Should further
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