GE GEK 106168E User Manual
Page 35
5. HARDWARE DESCRIPTION
28
DBF Breaker Failure Protection
GEK-106168E
5.2.3 POWER SUPPLY
The DBF power supply can be 48-125 VDC or 110-250 VDC rated. The operating margin of the power supply is +
20%, and is galvanically isolated from the rest of the relay's circuits. The power supply provides
±
12 VDC to the
analog circuitry and the output relays, and
±
5 VDC for the digital circuits.
5.2.4 KEYBOARD AND DISPLAY
The DBF display at the front of the relay is liquid crystal type and consists of two rows of 16 characters each. The
display has background light with variable lightness adjustable by a potentiometer located on the rear of the front
cover plate.