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1 Maintenance Instructions
The relay is a maintenance free device, 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 Ltd
7SG163 Ohmega 300 Series Maintenance
Chapter 10 Page 3 of 6
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