Technical data

1MRS751108-MUM
REX 521
49
Protection Relay
Technical Reference Manual, General
Table 5.2.1-5 Power outputs
Max. system voltage 250 V AC/DC
Continuous carry 5 A
Make and carry for 0.5 s 30 A
Make and carry for 3 s 15 A
Breaking capacity when control
circuit time constant L/R <40 ms, at
48/110/220 V DC
5 A/3 A/1 A
Minimum contact load 100 mA, 24 V AC/DC (2.4 VA)
TCS (Trip-circuit
supervision)
Control voltage
range
20…265 V AC/DC
Current drain
through the
supervision
circuit
approx. 1.5 mA (0.99…1.72 mA)
Minimum voltage
(threshold) over
a contact
20 V AC/DC (15…20 V)
Table 5.2.1-6 Environmental conditions
Specified service temperature range -10…+55°C
Transport and storage temperature range -40…+70°C
Enclosure class Front side, flush-mounted IP 54
Rear side, connection terminals IP 20
Dry heat test according to IEC 60068-2-2
Dry cold test according to IEC 60068-2-1
Damp heat test, cyclic according to IEC 60068-2-30,
r.h. >93%, T = 25…55°C
Storage temperature tests according to IEC 60068-2-48
Table 5.2.1-7 Standard tests
Insulation tests Dielectric test
IEC 60255-5
Test voltage 2 kV, 50 Hz, 1 min.
Impulse voltage
test
IEC 60255-5
Test voltage 5 kV, unipolar impulses,
waveform 1,2/50 µs, source
energy 0.5 J
Insulation
resistance
measurements
IEC 60255-5
Insulation resistance > 100 MΩ, 500 V DC
Mechanical tests Vibration tests (sinusoidal) IEC 60255-21-1, class I
Shock and bump test IEC 60255-21-2, class I
Seismic test IEC 60255-21-3, class 2
Table 5.2.1-8 Electromagnetic compatibility tests
The EMC immunity test level fulfills the requirements listed below
1 MHz burst disturbance test, class
III, IEC 60255-22-1
common mode 2.5 kV
differential mode 1.0 kV
Electrostatic discharge test,
class III
IEC 61000-4-2 and 60255-22-2
for contact discharge 6 kV
for air discharge 8 kV