GE IJC51E Instructions Manual page 4

GE K—65 583
RATI NGS
The IJC51E is a three-ph ase relay rated at 5 amperes, 50 or 60 hertz, with a
minimum
pickup of 1 ampere with zero restraint current.
There are four slope
selection s available , at 115, 125, 135 and 15O.
The relay has three target/se al—in
units, one per phase, rated at 0.2/2.0 amperes. The
inductio n-disk units and
target/se al—in units are contained in a large, Li size, drawout case.
CONTACTS
The main unit contacts have a maximum current-c losing rating of 30 amperes at
voltages not exceeding 250 volts DC for tripping duty.
The main unit contacts , when used without the target/se al—in unit contact, do
not have an interrupt ing rating; therefore , the trip current must be interrupt ed by
some other suitable means.
TARGET/SEAL-IN UNIT
The target/se al-in units are Hi-G units with 0.2 and 2.0 ampere taps. The 0.2
ampere tap can be used for trip circuits that have 2 amperes or less of tripping
current.
The 2.0 ampere tap is used in trip circuits that have at least 2 amperes
and up to 30 amperes of trip current available at the maximum control voltage. If
the tripping current exceeds 30 amperes, an auxiliary relay and contact must be used
to carry the trip current.
The connections should be made so that the trip current
does not pass through the IJC contacts or seal-in unit.
The target ratings are shown in Table I.
TABLE I
TAPS
0.2 Amp 2.0 Amp
DC Resistance
(ohms) 8.30 0.24
Minimum Operating
(amperes) 0.2 2.0
Carry Continuously
(amperes) 0.37
2.3
Carry 30 amperes (seconds) 0.05
2.2
I
Carry 10 amperes
(seconds) 0.45
20
60 Hertz Impedance
(ohms)
50
0.65
BURDENS
The burdens imposed
on
the
current transform ers
by
the operatin g and
restraini ng coils are listed in Table II.
4