Advertisement
Time Overcurrent Relays
AP PLICATION
The a -c tripping element is used in Type lAC
1
relays where a r e
i a b l e direct -current tripping
source is not available and it is necessary to trip the
breaker from the current -transformer secondary.
RATING
The a -c tripping element has a continuous rat
ing of five amperes but will operate on a minimum
current of
amperes. They should be used with
3 . 5
three -ampere trip coils. The contacts of these ele
ments will transfer current transformer secondary
current up to
ampere s . For applications where
100
t h e secondary current exceeds
REA l l B relay, which has contacts rated
peres, can be used in conjunction with lAC over -
RECEIVING, HANDLING AND STORAGE
These relays when not included as a part of a
i
control panel, wil
be shipped in cartons designed
to protect them against damage. Immediately upon
receipt of the relay, an examination should be made
for any damage sustained during shipment. If injury
or damage resulting from rough handling is evident,
a claim should be filed at once with the transporta
tion company and the nearest Sales Office of the
General E lectric Company notified promptly.
1
2
Fi g .
I n te r n a l Connect i on s for the Type
I I
I ACS I A R e l ay F ron t V i ew
1 0
Type lAC
amperes, the
100
am
200
6
•:sHORT F I NGER
current relays. The REA l l B is not mounted inside .-..
the lAC case.
BURDENS
Burdens of the REA element are given in the
following table :
Impedance
Am p
in Ohms
60
5
0.49
50
5
0.33
25
5
0.23
Reasonable care should be exercised in unpack
ing the relay in order that none of the parts are
injured or the adjustments disturbed.
If
the relays are not to be installed immediately,
they should be stored in their original cartons 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 re
moved and cause trouble in the operation of the relay.
I N DUCT I O N
. U N I T
2
1 2
.
F i g
I n ternal Connec t i o n s tor t h e Ty pe
I AC� I H k e l ay F ron t V i ew
Volt-
PF
Amperes
0.80
1 2 .2
0.85
8.4
0.62
5 . 8
'
6
* = S H ORT F I NG E R
Advertisement
