Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
390 Manual, 03/2019, A5E03603177010-03
Basic RCD320 and Basic RCD520
Features
The key features of the RCD320 and RCD520 series are:
● Type A
● Response current I
Δn
adjustable in eight steps from 0.03 A to 5 A
● Compact design
● Cover size 45 mm
● 3 and 4-pole versions
● LEDs to signal "ready" state and pre-alarms
● Tripped signal at device and via electrical contacts
● Signal must be acknowledged via the RESET button on the residual current device
● Suitable for use in 1-phase and 3-phase systems
The differences between the two RCD320 and RCD520 residual current devices designed
for loadside mounting are explained below:
● Time delay:
– RCD320 without time delay (instantaneous)
– RCD520 with an adjustable delay time Δt from 0 to 3000 ms
● Number of poles:
– RCD320 is available only in a 4-pole version
– RCD520 is available in 3-pole and 4-pole versions
● Rated operating current:
– RCD320 available only up to 160 A (3VA11)
– RCD520 available up to 250 A
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