0
0
0
GE K- 34055
TABLE VIII
RANGE
HZ
MIN.
BU RDENS AT MIN.
BU RDENS IN
V. A. AT 5 AMPS
TAP
PICKUP MIN. TAP
OHMS (Z)
CALCULATED FROM
IMPEDANCE AT MIN.
3
10
PICKUP (I
2
�)
R
Jx
z
TIMES TIMES
TIMES
PICKUP PICKUP PICKUP
0. 5
- 4.0
0. 5
0.80 1. 38 1.60
1.60
1. 60
1. 60
40
0.085
0.17
15. 0
60
0.10
('). 10
0.10
NOTE:
The impedance values given are those for the minimum tap of each relay. The impedance for other
taps at pick-up current (tap rating) varies inversely (approximately) as the square of the tap rating. For
example, for a relay with 0. 5 - 4.0 amp range, the
of the 0.5 amp tap is given as 1.60 ohms. The
impedance of the 2. 0 amp tap at 2.0 amperes is
X 1.6 or 0.10 ohm.
The instantaneous unit burdens are listed in Table IX.
TABLE IX
BU RDENS AT
BU RDENS
RANGE
CONNEC- MIN.
MIN. PICKU P
IN OHMS (Z)
VA AT 5 AMPS
60 HZ RELAYS
TIONS
TAP
3
10
20
CALCULATED F ROM
ONLY (AMPS)
*
AMPS
R
JX
z
TIMES
TIMES
TIMES
IMPEDANCE AT MIN.
OHMS
OHMS OHMS
PICKU P PICKU P PICKU P PICK-U P (I2
z
)
0.5-4.0
LOW
0. 5 12. 7
11. 5 17.1
9.6
8.7
8.2
427.5
HIGH
1.0
3. 18 2.87
4. 28
2. 40
2. 18
2.04
107.0
2. 0-16. 0
LOW
2.0
0.76 0.72
1.05
0. 59
0.53
0.50
26.25
HIGH
4.0
0. 189 0. 180
0.261
0.147
0.133
0. 125
6.63
10.0-80. 0
LOW
1
o.
0
0.042 0. 029 0.051 0.029
0.026
0.024
1. 28
HIGH
20.0
0.010 0.007 0.013 0.007
0.007
0.006
0. 33
20.0-160. 0
LOW
20.0
0.015 0.008 0.017 0.010
0.009
0.008
0.43
HIGH
40.0
0.004 0.002 0.004 0.002
0.002
0.002
0. 10
* Low means two windings connected in series.
High means two windings connected in parallel.
See Internal Connections diagram for additional information.
CHARACTER! STI CS
Pick-up of these relays is defined as the current required to close the contacts from the 0.5 time
dial position. The pick-up value in the IAC77 relays is within 3% of the tap value.
The setting of the time dial determines the length of time the unit requires to close its contacts
when the current reaches the predetermined value. The contacts are just closed when the dial is set
at zero. When the dial is set at 10, the disk must travel the maximum distance to close the contacts;
this gives the maximum time setting. The unit resets at 85% of the minimum closing value of current.
Figure 9 shows the 50 Hl and Figure 10 shows the 60 H� Time Current Characteristics for Relay types
IAC77 and IAC78. The time to reset to the 10 time dial position when the current is reduced to zero is
approximately 57 seconds.
The time current curve for the instantaneous unit is shown on Figure 8.
RECEIVING, HANDLING AND STO RAGE
These relays, when not included as a part of a control panel, will be shipped in cartons designed to
otect them against damage. Immediately upon receipt of a relay, examine it for any damage sustained in
7
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