INSTRUCTIONS
TIME
OVERCURRENT RELAY
TYPE IAC
MODEL
12IAC80L(-}A
INTRODUCTION
GEK-27870
Insert Booklet-
GEH-1788
This supplement in conjunction with GEH-1788 forms the instructions
for relay model 12IAC80L(-)A.
DESCRIPTION
Relay model 12IAC80L{-)A consists of a single lAC type time overcurrent
unit with a seal-in unit mounted in
a
small single ended
(Sl)
case.
This
relay is similar to model 12IAC53A(-)A described in GEH-1788 except:
1) The internal connections are as shown in figure
1
of this
supplement.
2)
The induction unit uses wound shading coils on the U-magnet to
provide torque control.
This control circuit (connected to studs
3 and
4)
must be completed in order that there be a phase displace
ment
in flux to rotate the disk.
When the shading coil circuit
is completed, torque can be developed on the induction disk and
the unit will operate on overcurrent.
When the shading coil circuit
is open, the unit will not operate at current levels up to 20 times
tap value.
The time current curves, burdens and ratings of this relay are as given
in GEH-1788 for model
12IAC53A(-)A.
Theee
ln1truction1
do
not purport to cover all details or variatlone
in
equi.-ent
nor to provide for every pollible contingency to
be
11et in connection with
inatallatlon,
operation or ••intenance.
Should further infor��ation be de1ired or 1hould partlcw1ar
probl
..
e
ariee which are not covered •ufficiently for
the
purcha1er•s IIU�Iel, the
�attar 1hould be referred to the General Electric to.pany.
POWER SYSTEMS MANAGEMENT DEPARTMENT
GENERAL
.
ELECTRIC
www
. ElectricalPartManuals
. com
