GE IAC60A Instructions Manual page 11

The current-closing rating of the contacts is
amperes for voltages not exceeding
30
The current-carrying ratings
selection of the tap on the target and seal-in coil
as indicated in the following table:
(sec)
Carry 30 amps for
(sec)
Carry 10 amps for
(amp)
Carry continuously
(amp)
Minimum operating
(amp)
Minimum dropout
DC r esistance (ohms)
(Oh'llS)
60 hertz impedance
(ohms)
50 hertz impedance
If the tripping current exceeds
auxiliary relay should be used, the connections being
such that the tripping current does not pass through
the contacts or the target and seal-in coils of the
protective relay.
Fig. J.
(K-6306891-l)
volts.
250
are affected by the
DUAL RATED
0.6/2.0
0.2/2.0
0.2 2.0 0.6 2.0
3.5
0.05 2.2 0.5
30
0.45 20 5.0
0.37 2.3 1.2 2.6
0.2 2.0 0.6 2.0
0.05 0.5 0.15 0.5
8.3 0.78 0.18
0.24
50 0.65 6.2 0.65
42 0.54 5.1 0.54
amperes, an
30
48
45
42
H
}6
'
.n
0
27
l
}0
24
�
[
21
T
I
A
"
18
15
12
9
6
)
TAP RANGES
0
0
• 6 8
MULTIPLES OF MINIMUM TAP SETTING
} OF TH[ TYPE
SATURATION CURVES AT VARIOUS FREQUENCIES
FOR
LO*EST TAP USED IN All CASES
Saturation Curves for Lowest Taps .,£ the Induction Unit
of Type lAC Relays with Inverse-time Characteristics.
Time Overcurrent Relays Type IAC
Burdens for the standard coils are given in the
following table.
five amperes based
Volt-ampere burdens for the lowest tap on any
of the three coils can be determined for any value
of current, up to
Coil
Freq.
Amperes
4-16 60
50
25
1.5-6.0
60
50
25
0.5-2.0 60
50
25
25
"'
RANGE
TAP
.5-2.0
60
50
"'
"'
2
TAP
60"' 1.5--ti.O
l
SO"'
5--.
RANGE
AIIPS.
50ft. AIIPS.
1
TAP
4-16
10
12 14 16 18 20
IAC51A RELAY
GEH-1753
BURDENS
These are calculated burdens at
on burden of minimum
times tap setting, from Fig.
20
Volt- Imp.
Tap
Amps
Ohms
4.0
8.8 0.35
4.0 8.0 0.32
4.0 7.5
0.30
1.5
59.0 2.36
1.5 52.0
2.08
1.5
48.0
1.92
0.5 530.0 21.2
0.5 470.0 18.8
0.5 430.0
17.2
tap.
3.
P F
0.29
0.31
0.36
0.26
0.28
0.34
0.26
0.28
0.34
5