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Type CKO Overcurrent Relay
CONTINUOUS
AMPERE
RATING
RANGE
TAP
(AMPERES)
0.5
0.91
0.6
0.96
0.8
1.18
0.5-2.5
1.0
1.37
1.5
1.95
2.0
2.24
2.5
2.50
2.0
3.1
2.5
4.0
3.0
4.4
2-6
3.5
4.8
4.0
5.2
5.0
5.6
6.0
6.0
4.0
7.3
5.0
8.0
6.0
8.8
4-12
7.0
9.6
8.0
10.4
10.0
11.2
12.0
12.0
†
Thermal capacities for short times other than one second maybe calculated on the basis of time being inversely proportional
to the square of the current.
ø
Degrees current lags voltage at tap value current.
††
Voltages taken with Rectox type voltmeter.
ENERGY REQUIREMENTS
TYPE CKO-2 TIME OVERCURRENT UNITS
ONE SECOND
POWER
†
RATING
FACTOR
ø
(AMPERES)
ANGLE
28
58
28
57
28
53
28
50
28
40
28
36
28
29
110
59
110
55
110
51
110
47
110
45
110
41
110
37
230
65
230
50
230
47
230
46
230
43
230
37
230
34
VOLT AMPERES
AT
AT 3 TIMES
TAP VALUE
TAP VALUE
CURRENT
CURRENT
4.8
39.6
4.9
39.8
5.0
42.7
5.3
45.4
6.2
54.4
7.2
65.4
7.9
73.6
5.04
38.7
5.13
39.8
5.37
*40.8
5.53
42.8
5.72
46.0
5.90
50.3
6.54
54.9
4.92
39.1
5.20
42.0
5.34
44.1
5.53
45.8
5.86
49.9
6.60
55.5
7.00
62.3
41-101.3A
††
AT 10 TIMES
AT 20 TIMES
TAP VALUE
TAP VALUE
CURRENT
CURRENT
256
790
270
851
308
1024
348
1220
435
1740
580
2280
700
2850
262
800
280
920
312
1008
329
1120
360
1216
420
1500
474
1800
268
848
305
1020
330
1128
364
1260
400
1408
470
1720
528
2064
5
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