GEH-1793
BURDENS
DC COILS
Burden data for DC coils is shown in Table 3.
TABLE 3
DC COIL BURDENS
-----------RE�1STAN�t---------------------Rt�1STAN�-----
----
--
VOLTS
+10%
WATTS
AMPS
+10%
WATTS
250
15500
4.03
1
3.42
3.42
125
3650
4.31
2
0.843
3.37
62.5
930
4.20
3
0.360
3.24
48
512
4.50
4
0.195
3.12
32
250
4.10
5
0.124
3.10
24
160
3.60
12
41
3.51
6
9.9
3.60
AC COILS
Certain quantities should be defined before giving burden data for AC coils:
Roc is resistance of a coil as measured with an ohmmeter,
bridge, etc.
Roo is the AC resistance of a coil when AC power is flowing through
the coil, but the relay is not picked up.
X
o
o
is the inductive impedance when the coil is energized, but the
relay is not picked up. The resistive and inductive parts of
impedance of coils under picked-up conditions are designated
as
Rpu
and
Xpu
Zoo is the impedance of the relay in dropout condition
Zpu
is the impedance of the relay in picked-up condition.
TABLE 4
AC COIL BURDENS
--corr----RATrNG
____
Roc
______
Roo
_____
xoo
______
zoo
_____
R
p
u ___ --xru ____
zpu--
voLTs
HERTZ
+10%
+10%
+10%
+10%
+10%
+10%
+10%
115
230
460
575
. 60
60
60
60
90
376
1640
2200
210
860
3770
4090
510
2060
9010
11400
5
550
2230
9770
12400
Continued
377
1260
4590
7470
926
3750
16400
20800
1000
3960
1700
22100
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