ABB REF 610 Technical Reference Manual page 152

REF 610 REF 610
152
Feeder Protection Relay
Technical Reference Manual
Auxiliary voltage
The relay requires a secured auxiliary voltage supply to operate. The internal power
supply of the relay forms the voltages required by the relay electronics. The power
supply is a galvanically isolated (flyback-type) DC/DC converter. When the
auxiliary voltage is connected, the green indicator LED (ready) on the front panel is
lit. For detailed information on power supply, refer to Table 5.2.4.-2.
The primary side of the power supply is protected with a fuse located on the printed
circuit board of the relay.
1MRS755310