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41-101.3A
TYPE CKO-5 AND TYPE CKO-6 TIME OVERCURRENT UNITS
CONTINUOUS
AMPERE
RATING
RANGE
TAP
(AMPERES)
0.5
0.6
0.8
0.5-2.5
1.0
1.5
2.0
2.5
2
2.5
3
2-6
3.5
10.4
4
11.2
5
12.5
6
13.7
4
16.0
5
18.8
6
19.3
4-12
7
20.8
8
22.5
1 0
25.0
1 2
28.0
CONTINUOUS
AMPERE
RATING
RANGE
TAP
(AMPERES)
0.5
2.7
0.6
3.1
0.8
3.7
0.5-2.5
1.0
4.1
1.5
5.7
2.0
6.8
2.5
7.7
2
8.0
2.5
8.8
3
9.7
2-6
3.5
10.4
4
11.2
5
12.5
6
13.7
4
16.0
5
18.8
6
19.3
4-12
7
20.8
8
22.5
1 0
25.0
1 2
28.0
†
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.
††
6
Voltages taken with Rectox type voltmeter.
ENERGY REQUIREMENTS
ONE SECOND
†
RATING
(AMPERES)
2.7
88
3.1
88
3.7
88
4.1
88
5.7
88
6.8
88
7.7
88
8.0
230
8.8
230
9.7
230
230
230
230
230
460
460
460
460
460
460
460
CKO-7 TIME OVERCURRENT UNITS
ONE SECOND
†
RATING
(AMPERES)
88
88
88
88
88
88
88
230
230
230
230
230
230
230
460
460
460
460
460
460
460
POWER
AT
AT 3 TIMES
FACTOR TAP VALUE
TAP VALUE
ø
ANGLE
CURRENT
CURRENT
69
3.92
68
3.96
67
3.96
66
4.07
62
4.19
60
4.30
58
4.37
67
3.88
66
3.90
64
3.93
63
4.09
62
4.12
59
4.20
57
4.38
65
4.00
63
4.15
61
4.32
59
4.35
56
4.40
53
4.60
47
4.92
POWER
AT
AT 3 TIMES
FACTOR TAP VALUE
TAP VALUE
ø
ANGLE
CURRENT
CURRENT
68
3.88
67
3.93
66
3.93
64
4.00
61
4.08
58
4.24
56
4.38
66
4.06
63
4.07
63
4.14
62
4.34
61
4.34
59
4.40
58
4.62
64
4.24
61
4.30
60
4.62
58
4.69
55
4.80
51
5.20
46
5.40
Type CKO Overcurrent Relay
††
VOLT AMPERES
AT 10 TIMES
AT 20 TIMES
TAP VALUE
CURRENT
20.6
103
20.7
106
21.0
114
21.4
122
23.2
147
24.9
168
26.2
180
21.0
110
21.6
118
22.1
126
23.1
136
23.5
144
24.8
162
26.5
183
22.4
126
23.7
143
25.3
162
26.4
183
27.8
204
30.1
247
35.6
288
††
VOLT AMPERES
AT 10 TIMES
AT 20 TIMES
TAP VALUE
TAP VALUE
CURRENT
CURRENT
20.7
103
20.9
107
21.1
114
21.6
122
22.9
148
24.8
174
25.9
185
21.3
111
21.8
120
22.5
129
23.4
141
23.8
149
25.2
163
27.0
183
22.8
129
24.2
149
25.9
168
27.3
187
29.8
211
33.0
260
37.5
308
TAP VALUE
CURRENT
270
288
325
360
462
548
630
308
342
381
417
448
540
624
376
450
531
611
699
880
1056
278
288
320
356
459
552
640
306
342
366
413
448
530
624
392
460
540
626
688
860
1032
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