ABB REJ 527 Technical Reference Manual page 57

ABB Substation Automation
Products and Systems
1MRS750616-MUM
Technical Reference Manual
Table 49: Data communication
Rear interface, connector X2.2
• RS-485 connection for fibre-optic interface module RER 103
• SPA-bus protocol
• 4.8 or 9.6 kbps
Front panel
• Optical RS-232 connection for opto-cable
• SPA-bus protocol
• 4.8 or 9.6 kbps
Auxiliary voltage
For its operation the relay requires a secured auxiliary voltage supply. 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. A green
READY LED on the front panel is lit when the power supply module is operating.
Input voltage ranges are:
• AC range 80...265 V ac, rated 110/120/220/240 V
• DC range 38...265 V dc, rated 48/60/110/125/220 V
The primary side of the power supply is protected with a fuse located on the PCB of
the relay. The fuse size is 2.5 A (slow). In case the fuse is assumed to be blown,
please contact your relay supplier.
REJ 527
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