Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
391
Residual current devices types B and B+ for loadside mounting are supplied for
3VA11 molded case circuit breakers up to 160 A.
Type B is also described as universal current sensitive. Unlike residual current devices
RCD320 or RCD520, devices of the type RCD520B detect smooth DC residual currents in
addition to pure sinusoidal AC residual currents and pulsating DC residual currents.
The key features of the RCD520B series are:
● Types B and B+ (selectable)
● Type B+ meets the requirements for advanced preventative protection against fire
according to VDE 0664-400
● Use as residual current device or residual current display unit (selectable)
● Response current I
Δn
adjustable in
Type B: 8 steps from 0.03 A to 5 A
Type B+: 4 steps from 0.03 A to 0.3 A
● Delay time Δt adjustable in 10 steps from 0 to 10000 ms
● Compact design
● Cover size 45 mm
● 3 and 4-pole versions
● LEDs to signal "ready" state, pre-alarm and MONITORING mode
● Integrated auxiliary contacts for tripped signals and pre-alarms
● Signal must be acknowledged via the RESET button on the residual current device
● Tripping by means of plunger
● Periodic self-test functions
● Selection between type B/type B+:
– Selection of tripping characteristic (B or B+) possible
● Selection between RCD mode and MONITORING mode:
– RCD520B functions as a protection device in "RCD mode"
– RCD520B functions purely as a display unit in "MONITORING mode"
● Number of poles:
– The 3-pole version of RCD520B is installed in a 4-pole enclosure
● Rated current:
– RCD520B available for 3VA11 (160 A) molded case circuit breaker
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