Siemens 7SG23 MSCDN – MP2A Manual page 76

1. Maintenance Instructions
The MSCDN-MP1, MP2A and MP2B relays are maintenance free relays, with no user serviceable parts.
During the life of the relays they 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
MSCDN – MP2A Maintenance
Chapter 8 Page 3 of 4