Advertisement
TYP E CO CIRCUIT O P E N I N G R E LAY
INTERNAL SCHEMAT IC
OPERAT!OM I N D I CATOR "
AUX. CURRENT
TRANSF. SECOIIDARY
FRONT VIEW
MOTE: TERM. 2 AMD 8 ARE TD 8E
.IUMPERED AT RELAY CASE
Fig. 1 . Internal Schematic of the Circuit Opening Type
CO Relay in Type FT2 1 Case.
ated clapper type devic e .
which leaf-spring mounted c ontacts are attached, is
attracted to the magnetic core upon energization of
the switch.
When the switch closes , the moving
contacts bridge two stationary c ontacts 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.
CHARAC T E R I ST I CS
The relays are available in the following c urr e nt
range :
2
DE-1011
---- --
COIITACTOR SWITCH
---- -- -
AUX. CURRENT
TRANSF. PRH4ARY
IIIDUCTlOII U N I T
CHASS I S OPERATED
SHORTI N G
SWITCII
URREIIT TEST .IAC•
TERMINAL
l83A055
A magnetic armature , to
INTERNAL SCMEMATIC
A UX.
CUIIEIIT
TRAitSF .
SECOIIDARY
TEST
S lli i TCH
2 AII D 8 AlE TO
MOTE:
TERN.
CAll
IE
JUMPUED AT IIU.Y
*
Fig. 2 . Internal Schematic of the Circuit Opening Type
CO
Re lay,
With Indicating
in Type F T 2 1 Case.
RANGE
4 - 1 2
4
5
T he circuit-opening relay i s recommended only
1 2
in the 4 to
ampere range. A lower range is not
desirabl e because the burden o f a low-range trip
coil is too heavy on the current transformer. One
trip coil i s required for each relay.
*
The burden on the current transformer at
i s 4 . 6
with contacts
V A
with contacts open.
V A
The time vs. current characteri sti c s are shown
in Figs. 3 to 9. These characteri stics give the con
tact clo sing time for the various time dial setting s
when the indicated multipl es of tap value current
are applied to the rel ay.
DE-lOll
COIITACTOR
SIITCII
AUX. CURIEIIT
TRAIISF. PRIM.
IIIDICATI.II G
IIISTA.II T UEOtiS
T R I P U II I T
DU
IO
LUI
I II
C
T
M
I
T
C lt.lJSIS OPEilAT£0
IKOITIMG SWITCH
CUIIfMT TEST .IACI
l83A0 5 4
Instantaneous Trip,
TAPS
6
7
8
10
1 2
-±
amp s.
l l T
CO
and
cl osed and
5 . 7
Advertisement
