Siemens 3VA1 100 A Manual page 296

Accessories
4.8 Residual current devices
Advantages
● Slimline, side mounted design (30 mm) leaves space for other components in the
distribution board.
● The residual current devices, the 3VA1 molded case circuit breakers and the 3VA1 switch
disconnectors all have a cover size of 45 mm, so that they are easy to install, for
example, adjacent to miniature circuit breakers in a distribution board.
● With the DIN rail adapter accessory installed, RCD310 and RCD510 units up to 160 A
can be mounted easily on a DIN rail.
The side-mounted residual current devices also feature a screw mounting option so that
they can be attached directly to a mounting plate.
Basic RCD320 and Basic RCD520
Features
The key features of the RCD320 and RCD520 series are:
● Type A
● Response current I
● 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
Special characteristics
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
296
adjustable in 8 steps from 0.03 A to 5 A
Δn
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02