SC, SC-1, SV and SV-1 Relay I.L. 41-766.1N
7
NOTES: Standard current relays are calibrated on 60 hertz. This calibration is approximately correct for 25 hertz and dc
applications, but there will be discrepancies of 10% to 15% at some points on the scale.
Values of watts and volt-amperes in the tables are average for various plunger and shunt position.
For the SC relay, volt-amperes for pickup at minimum setting are approximately 3.4 and 1.4 for 60 and 25 hertz.
Watts at minimum setting are approximately 1.0, .65 and .57 for 60 hertz, 25 hertz and DC respectively. Multiply
values by 16 for approximate burdens at maximum setting.
For the SC-1 relay, volt-amperes for pickup at minimum setting are approximately 3.5 and 1.3 for 60 and 25
hertz. Watts at minimum settings are 1.3, .7 and .57 for 60 hertz, 25 hertz and dc respectively. Multiply values by
16 for approximate burdens at maximum setting.
* The V.A. burdens of the SC and SC-1 relays at 3, 10 and 20 times minimum pickup current are approximately 31,
240 and 770 V.A. respectively.
Dropout ratio varies somewhat with pickup adjustment but will be approximately constant for any given pickup
setting. Limits in tables include variables such as friction and other individual relay variations.
Maximum continuous volts given for the SV and SV-1 relays for ac are for the relay set for minimum pickup. With
the relay set for maximum pickup the continuous voltage can be increased 10 to 20%.
CHARACTERISTICS OF SV AND SV-1 RELAYS
Type
Frequency
(Hertz)
Range of
Adjustment
Volts
Max. Volts
Continuous
Watts at
115 V. AC
(125 V. For DC)
V.A. at
115 V.
Dropout
Ratio
SV
SV
SV
SV
SV
SV
SV
SV
60
60
60
60
50
25
DC
DC
7-16
70-160
140-320
280-640
70-160
70-160
50-150
100-300
16
160
320
640
180
200
150
300
—
3.4
—
—
2.8
1.5
4.8
—
—
7.3
—
—
6.1
2.5
—
—
85-98%
85-98%
85-98%
85-98%
85-98%
85-98%
65-80%
65-80%
SV-1
SV-1
SV-1
SV-1
SV-1
SV-1
SV-1
SV-1
60
60
60
60
50
25
DC
DC
7-16
70-160
140-320
280-640
70-160
70-160
50-150
100-300
16
160
320
640
180
200
150
300
—
4.1
—
—
3.5
1.4
4.8
—
—
8.5
—
—
7.1
3.2
—
—
40-80%
40-80%
40-80%
40-80%
40-80%
40-80%
25-40%
25-40%
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