ABB REX 521, Technical Reference Manual, General

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1MRS 751108-MUM Protection Relay
Technical Reference Manual, General
REX 521
• optically isolated serial communication port
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• contrast adjustment with temperature compensation
• backlight control
4.1.15. Indication LEDs
The relay is provided with three indication LEDs (green, yellow and red). With
latching/non-latching, steady/blinking light the LEDs indicate different states and
operations of the relay. For more information, refer to Operator’s Manual.
4.2. Design description
4.2.1. Technical data
Table 4.2.1-1 Energizing inputs
Rated frequency 50.0/60.0 Hz
Current inputs rated current 0,2 A/1 A/5 A
Thermal withstand
capability continuously 1.5 A/4 A/20 A
for 1 s 20 A/100 A/500 A
dynamic current withstand, half-wave value 50 A/250 A/1250 A
input impedance <750 m
Ω
/<100m
Ω/
<20 m
Ω
Voltage inputs rated voltage 100 V/110 V/115 V/120
V (parametrization)
voltage withstand, continuous 2 x U
n
(240 V)
burden at rated voltage <0.5 VA
Sensor inputs voltage range RMS 9.4 V RMS
voltage range peak ± 12 V
input impedance >4.7 M
Ω
input capacitance <1 nF
Table 4.2.1-2 Auxiliary power supplies
Type PS_87H
(REX521xxHxx) PS_87L
(REX521xxLxx)
Input voltage, ac 110/120/220/240 V -
Input voltage, dc 110/125/220 V 24/48/60 V
Operating range ac 85…110%, dc 80…120% of
rated value dc 80…120% of rated value
Burden <20 W
Ripple in dc auxiliary voltage max. 12% of the dc value
Interruption time in auxiliary dc
voltage without resetting <50 ms, 110 V and
<100 ms, 200 V <20 ms, 24 V and
<100 ms, 48 V
Internal overtemperature
indication +78
°
C (+75…+83
°
C)