INDUCT ION
UN
IT
2
INSTANT.
UN
IT
INST ANT,
UNIT
10
• *
S�ORT
fiNGER
Fig. 1�
(K-6209663
[8])
Internal Connections for
the Type IAC�2B Relay (Front View)
Time Overcurrent Relays Type IAC
GEH-1753
TO
TIMER
"STOP"
--
TO INDICATING
LIGHT
WHEN
CHECKING PICKUP
OF MAIN UNIT
-
----
r---
........,.
TO INDICATING LIGHT WHEt
CHECKING PICKUP
OF
INSTANTANEOUS UN IT
3
4
5
0
0
0
0
6
7
8
9
10
X
LA13 TEST PLUG
TO TIMER
"START"
MIN.
RECCWENDED V
O
LT
S
,
120
AT RATED FREQUENCY
TO
ACCURATELY REPRO[lJCE
RELAY CHARACTERISTICS
ALL TESTS SHOULD
BE
�
WI� RELAY
IN
CASE.
Fig. 16
(
K-6154399-7
)
Testing Connections for
Type lAC Relays such as Type IAC51A
INSTALLATION
LO
C
ATION
The location should
be
clean and dry, free from
dust and excessive vibration, and well lighted to
facilitate inspection and testing.
MOUNTING
The relay should
be
mounted on a vertical
surface. The outline and panel diagrams are shown
in Figs.
20
and
21.
CONNECTIONS
Internal cormection diagrams for
the
various
relay types are shown in Fig.
11
to
17
inclusive.
Typical wiring diagrams are given in Fig.
4
to
6
inclusive.
One of the mounting studs or screws should
be
permanently grounded by a conductor not less than
No.
12
B&S
gage copper wire or its equivalent.
INSPICTION
At the time of installation, the relay should be
inspected for tarnished contacts, loose screws, or
other imperfections.
If
any trouble is found, it
should be corrected in the manner described under
MAINTENANCE.
CAUTION:
Every circuit in the drawout case has an auxi
liary brush. It is especially important on current
circuits and other circuits with shorting bars that
the auxiliary brush be bent high enough to engage
the connecting plug or test plug before the main
brushes do.
This will prevent CT secondary cir
cuits from being opened.
CONNECTING PLUG MAIN
BRUSH
CONNECTING BLOCK
NOTE: AFTER ENGAGING AUXILIARY BRUSH,
CONNECTING
PLUG
TRAVELS 1/4
INCH BEFORE ENGAGING THE
MAIN
BRUSH
ON
�HE TERMINAL BLOCK.
Fig. 17
(8025039)
Cross Section of Drawout Case
Showing Position of Auxiliary Brush.
11
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