7SG11 Argus 8 Performance Specification
1 General
The relay complies with the relevant clauses in the following specification :-
• IEC 60255 - 3
2 Characteristic Energizing Quantity
AC Voltage Vn 63.5 / 110 Vrms
Frequency 50 / 60Hz
3 Auxiliary Energising Quantity
3.1 DC Power Supply
Nominal Operating Range
V
AUX
24, 30, 48V 18V to 60V dc
V
AUX
110, 220V 88V to 280V dc
3.2 DC Status Inputs
Nominal Voltage Operating Range
30 18V to 37.5V
48 37.5V to 60V
110 87.5V to 137.5V
220 175 to 280V
NB : the status operating voltage need not be the same as the main energising voltage. For 110/125V or
220/250V working, a standard Argus relay with 48/54V status can be supplied for use with external dropper
resistors as follows:-
Status Input External Resistances
Nominal Voltage Resistor Value (Wattage)
110 2k7 ± 5% ; (2.5W)
220 8k2 ± 5% ; (6.0W)
Status Input Performance
Minimum DC current for operation 10mA
Reset/Operate Voltage Ratio
≥ 90%
Typical response time < 5ms
Typical response time when programmed to energise an
output relay contact
< 15ms
Minimum pulse duration 40ms
Each status input has associated timers which can be programmed to give time delayed pick-up and time delayed
drop-off. The drop-off timers have default settings of 20ms, thus providing immunity to an AC input signal. Status
inputs will not respond to the following:
• 250V RMS 50/60Hz applied for two seconds through a 0.1μF capacitor.
• 500V RMS 50/60Hz applied between each terminal and earth.
• Discharge of a 10μF capacitor charged to maximum DC auxiliary supply voltage.
The inputs meet the requirements of ESI 48-4.
Note : special versions of status input are available for direct operation from 110V and 220V supplies. These do
not comply with the ESI 48-4 specification and will operate with a DC current of less than 10mA.
©2011 Siemens Protection Devices Limited Chapter 2 Page 3 of 9
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