1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
7
2.  Safety information
Dangerous voltages can occur on the connectors, even though the 
auxiliary voltage has been disconnected
National and local electrical safety regulations must always be 
followed
The device contains components which are sensitive to electrostatic 
discharge
The frame of the device has to be carefully earthed
Only a competent electrician is allowed to carry out the electrical 
installation
Non-observance can result in death, personal injury or substantial 
property damage
Breaking the sealing tape on the rear panel of the device will result in 
loss of warranty and proper operation will no longer be guaranteed
!