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T Y P E CO C I RCU I T O P E N I N G R E LAY
INTfRNAL SCHEMATIC
OPERAT IOM IMOICATOR
AUX. CURRENT
TRANSF. SECONDARY
TEST SW ITCH
FROII T YIEV
2
NOTE: TERM.
AIID 8 ARE TO BE
JUMPERED AT RELAY CASE
J.
Fig.
Internal
Schematic of the Circuit Opening Type
CO R e lay in Type F T2 l Case.
magnetic
core
upon
energization
When the switch closes two fingers on the armature
deflect a spring located on the front of the switch,
which allows the operation indicator target to drop.
The
front spring,
in addition to holding the
target, provides restraint for the armature and thus
controls the pickup value of the switch.
INDICATING INSTANTANE OUS TRIP UNIT (liT)
The instantaneous trip unit is a small a-c oper
ated clapper type device.
which leaf-spring mounted contacts are attached, is
attracted to the magnetic core upon energization of
the switch.
When the switch closes , the moving
contacts bridge two stationary contacts completing
the
trip circuit.
Also, during the operation , two
fingers on the armature deflect a spring located on
the front of the switch which allows the operation
indicator target to drop.
A core screw accessible from the top of the
switch provides the adjustable pickup range.
2
DE·IOH
CONTACTOII SWITCH
AUX. CURRENT
TRAMSF. PRIMARY
IMOUCTIOit UN IT
CHASSIS OPEUTIO
SttORTIIIQ SWITCH
URREIIT TEll JACj�:
SUB.
2
EIIM
N
183A055
T
I
AL
of
the switch.
A magnetic armature, to
INTERNAL SCHEMATIC
OPERATION
IND ICATOR
AUX. Ci.JIIUHT
TRAHSF. SECONDARY
TEST S .. ITCH
2
ltOTE:
TERM.
AHO 8 All[ TO fiE
JUMPEIIED AT RELAY CASE
Fig. 2.
Intern a l
S chematic
CO
Rttlay,
With
in Type F T2l Case.
CHARACT E R I ST I CS
The relays are available in the following current
range:
R
_______
4 - 1 2
4
5
ThP
circuit-opt'nin.l.': relay is rL•cornmendPd only
-1 t
12
in the
o
ampere range.
dPsirahh'
lwcausP
the
too
coil
is
heavy
on
trip coil is fl'CJUired for Pach rel a y.
VA
auxiliary
VA
The burden of the
0 4 amps. is 4.6
with contacts IIT or CO closed
and 5.7
wit h contacts open.
The ti!llt' 1·s. currl'nt charactnistics
Figs. :3
9.
in
to
Thl' se charactl'ri stic s give
tlw
tact closing timl' for
Uw i
c
e
n
1\hen
di
at
d multipll'S of
to
fl'la.y.
ttll'
are applit'd
OE-JOH
COHTACTOR SW I TCH
AUX. CURRENT
TRAHSF. Pill�.
INDICATING
INSTAIHAHEOUS
TR IP UltiT
!IWUCTIOM UII IT
CMASSIS OPEIIATED
SHORTING SW' ITCII
SUB.
TERMINAl
183A0 5 4
FRONT YIEV
of the Circuit Opening Type
Indicating
Instantaneo us
Trip,
_I_i\..P_§._
..
_______ _
6
7
1 0
8
12
l\
is
lo\\Cr rangP
low-range trip
burden
of
a
thP
curn'nt
transformPr. One
current t ransformer at
are
h
w
s
o
the
con
tinH'
rarious
dial sdtings
tap value current
3
not
n
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