Siemens 7SG12 DAD-N Manual page 84

1 Maintenance Instructions
The Argus 7 is a maintenance free relay, with no user serviceable parts. During the life of the relay it should be
checked for operation during the normal maintenance period for the site on which the product is installed. It is
recommended the following tests are carried out :
1 Visual inspection of the metering display (every year)
2 Operation of output contacts (every 2 years)
3 Secondary injection of each element (every 5 years)
©2010 Siemens Protection Devices Limited
7SG12 DAD N Maintenance
Chapter 8 Page 2 of 3