GEK-49827
OVERCURRENT RELAYS
TYPES
IFC51 AD
and
51BD
IFC53AD
and
53BD
IFC77AD
and
77BD
INTRODUCTION
These instrurfons plus those in the included book,
GEK-45375,
form the instructions for
these relays.
DESCRIPTION
The Types
IFC51AD, IFC53AD
and
IFC77AD
covered by
these instructions are similar respectively to the
IFC51A,
IFC53A and IFC77A in the included instructions except that the target seal-in
units have two
elec
trically separate contacts.
The Types
IFC51 BD, IFC53BD and IFC77BD
are similar respectively to the
IFC51B,
IFC53B
and
IFC77B
except that each target seal-in and instantaneous unit has two
electrically seoarate
contacts.
The internal connections are included in these instructions as tabulated below:
Types
IFC51AD, -53AD, -77AD
IFC51BD, -53BD, -77BD
A
PP
L
I
CA
T
I
O
N
Figure
1
2
The application areas of these relays are the same in all respects
to those covered by the
APPLICATION
section in the included instructions,
GEK-45375.
N
o
te that the
second contact on the seal-in unit, and the
instantaneous overcurrent unit when present, is intended for
local alarm and/or remote indication as shown
on the typical external connections in Figure
3
of these instructions.
All
other sections of the included book,
GEK-45375,
also apply to these relays.
These instructions do not purport to cover all details or variations in equipment nor to provide for
every possible contingency to be met in connection with installation,
operation or maintenance.
Should
further information be desired or should particular problems arise which are not covered sufficiently for
the purchaser's purposes, the matter should be referred 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.
3
www
. ElectricalPartManuals
. com
