GEH-1791
The approximate reset time of the 12IJS51A3A and 12IJS52A7A is 130 seconds at the
No. 10 time-dial setting. The approximate reset time with one coil energized varies
from 13 seconds on the 200 setting to 20 seconds on the 600 setting at the No 10
time-dial setting.
The 25-cycle Type IJS relay has operating characteristics as shown in Figure 7.
Figure 8 gives the operating time in seconds for various time-dial settings. with 0
phase displacement and with rated voltage at 60 cycles on both circuits.
Curves for
25 cycles are similar. except that the operating time from the No. 10 time-dial
setting is 32 seconds instead of 20 seconds.
RATINGS
The operating and restraining coils are continuous rated.
The tap setting used on
the seal-in unit is determined by the current drawn by the contact circuit.
The 0. 2-ampere tap is for use with circuits that operate on currents ranging from
0. 2 up to 2. 0 amperes at the minimum control voltage.
If this tap is used with
circuits requiring more than 2 amperes. there is a possibility that the . 7-ohm
resistance will reduce the current to so low a value that the proper current may not
be obtained.
The 2. 0-ampere tap should be used with circuits that take 2. 0 amperes or more at
minimum control voltage. provided the current does not exceed 30 amperes at the
maximum control voltage.
If the current exceeds 30 amperes. an auxiliary relay
should be used. the connections being such that the current does not pass through
the contacts or the target and seal-in coil of the protective relay.
The current-closing rating of the contacts is 30 amperes for voltages not exceeding
250 volts. The current carrying ratings are affected by the selection of the tap on
the seal-in coil, as indicated in the following table:
*
Function
Momentary Duty
Carry Continuously
* Revised since last issue
Target and Seal-in Coil Amperes. AC or DC
2-Amp Tap
(
0. 13 ohm
)
30
2. 3
5
0. 2-Amp Tap
(
7 ohms
)
5
0. 37
www
. ElectricalPartManuals
. com
