8
1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
3. Instructions
3.1. HMI features
3.1.1. Front panel
The front panel of the protection relay includes:
• an alphanumeric 2 x 16 characters’ LCD with backlight and contrast control
• three indicator LEDs (ready, start, trip)
• an HMI push-button section with four arrow buttons and buttons for clear and
enter
• an optically isolated serial communication port
)LJ )URQWYLHZRIWKHUHOD\
1. LCD
2. Optical PC-connector
3. HMI push-button section
4. Indicator LEDs:
• Left: Ready (green)
• Centre: Start (yellow)
• Right: Trip (red)
REJ 521
Order No: REJ521B 413-BAA
Article No: 1MRS118011
Serial No: ER 000001
Uaux = 110-240 Vac
Uaux = 48-220 Vdc
fn = 50/60 Hz
In = 0.2/1 A (Io)
In = 1/5 A (I)
C
E
STARTREADY TRIP
ABB
1
2
3
4
Frview_521
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