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,.
It is impo rtant to note that these type IRT relays detect actu al tempe ratu re , not
rise above ambient .
trends in ambient tem pe ratu re .
The o pe rating u nit of the type IRT relays has a center ta pped coil that permits
o peration at eithe r 1 20 o r 24 0 volts AC * .
coils m u st be connected in series .
must be connected in parallel .
connections .
The IRT5 1E and IRT5 1F models have an internal , ins ulated stand off po st
fo r making the series connection , while the IRT5 1 G and IRT5 1 H mod el s bring all of
the o pe rating coil leads to sepa rate terminals external to the relay .
and IRT5 1 F mod els are shi pped from the facto ry connected .fo r 240 volt o pe ration .
*
Some mod els of the IRT5 1 F
Table I .
The type IRT relay s are suitable fo r o peration on 5 0 hertz and 6 0 hertz powe r
systems .
The type IRT relays are designed fo r use with the following specific type
resistance temperatu re detectors:
a .
1 0 ohms at 250C c o p per RT Ds
1 0 0 ohms at o o c planinum RT Ds
b .
1 20 ohm at o o c nickel RT Ds
c .
Use only the s pecific RTD for which the pa rticula r m o del IRT was designed .
The IRT5 1 E , IRT5 1 G and IRT5 1 H relays are fu rnished with a ta rget and seal-in
u nit having ta ps f o r 0 . 2 amps DC and 2 . 0 am ps DC o pe ration .
different ratings based on ta p settings .
I
Minimum DC o perating cu rrent
!
I
DC re si stance +10%
!
T ripping d uty
i
Carry 3 0 amps
i Carry 1 0 amps
/
Carry cent i nu o u s
Contact c u rrent c
The ta p setting u sed on the seal-in units is determined by the cu rrent d rawn by
the trip ci rcuit .
GEK-86038
The temperatu re setting sho uld be made on the basis of long term
For 1 20 volt o pe ration , the two o pe rating coils
See Fig u res 1 0 , 1 1 and 12 fo r the AC powe r s o u rce
(
)
-
A relay a re rated at 1 10/220 VAC o r DC .
..
TARGET SEAL-IN UNIT RATINGS
TAP
-
1
o s i ng rating
The 0 . 2 am p tap is f o r use with trip circuits that o pe rate o n
RATINGS
Fo r 24 0 val t o pe ration , the two o pe rating
TABLE 2
+0%
_25%
(
)
ohms
(
)
amps
(
)
seconds
(
)
second s
(
)
amps
(
)
amps
(
)
volt s Max.
6
The IRT5 1 E
Table 2 show s the
2 . 0
0 . 2
0.2
2 . 0
7 . 0
0 . 1 3
5 . 0
3 0 . 0
0 . 0 3
4 .0
0 . 2 5
3 0 . 0
3 . 0
0 . 3
30
3 0
250
25 0
See
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