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GEH-l'/MM
'rype IAC 'rime
Overcurrent
Relay
APPLICATION
The a-c tripping unit is used in Type IAC relays
where a reliable direct-current tripping source is
not available and it is necessary to trip the breaker
from the current-transformer secondary.
RATINGS
T6S1
BREAKER
TRIP COIL
The a-c tripping Wlit has a continuous rating of
CURRENT
five amperes but will operate on a minimum current
TRANS
of 3.5 amperes.
It
should be used with three-
ampere trip coils. The contacts of these units will
transfer current-transformer secondary current up
to 100 amperes.
For applications where the sec-
ondary current exceeds 100 amperes, the Type
REAllB relay, which has contacts rated 200 am-
peres, can be used in conjWlction with Type IAC
overcurrent relays.
The Type REAllB is not
mOWlted inside the Type IAC case.
aURDENS
Burdens of the Type REA unit are given in the
following table:
Impedance
PF
Volt-
Frequency Amps
in Ohms
Amperes
60
5
0.49
0.80
12.2
50
5
0.33
0.80
8.3
25
5
0.23
0.62
5.8
*
Fig. II
Diagram Illustrating Operation of Type
lAC Relays having an A-C Tripping Unit
RECEIVING, HANDLING AND STORAGE
These relays, when not included as a part of a
control panel will be shipped in cartons designed to
protect them against damage.
Immediately upon
receipt of a relay, examine it for any damage
sustained in transit.
If
injury or damage resulting
from rough handling is evident, file a damage claim
at once with the transportation company and promptly
notify the nearest General Electric Apparatus Sales
Office.
Reasonable care should be exercised in Wlpack-
ing the relay in order that none of the parts are
injured or the adjustments disturbed.
If
the relays are not to be installed immed-
iately, they should be stored in their original car-
tons in a place that is free from moisture, dust
and metallic chips.
Foreign matter collected on
the outside of the case may find its way inside
when the cover is removed and cause trouble in
the operation of the relay.
INSTALLATION
LOCATION
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 diagram is shown
in Fig. 20.
CONNECTIONS
The internal connection diagrams for the various
10
*
Indicates Revision
relay types are shown in Figs. 12 to 17 inclusive.
Typical wiring diagrams are given in Figs. 8 to
10 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.
INSPECTION
At the time of installation, the relay should
be inspected fur tarnished contacts, loose screws,
or other imperfections.
If
any trouble is fOWld,
it should be corrected in the manner described
under MAINTENANCE.
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