Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
438 Manual, 03/2019, A5E03603177010-03
Die <RESET> button on the residual current device releases, thus signaling that the
residual current device has tripped. At the same time, the trip alarm switch (TRIP-IND)
operates so that the tripped status can be transmitted to an indicator light in the panel
door, for example (see also Table "Scenario A" in chapter "Connecting terminals", section
"Status indicators").
The molded case circuit cannot be switched back on until the fault has been rectified and
the <RESET> button has been pressed.
The residual current device is set to RCD mode as supplied.
● MONITORING mode
In MONITORING mode, the device functions purely as a display unit. In this mode, the
"ACT" LED flashes and the "MONITORING" LED is lit.
If the residual current exceeds the response current set on the RCD520B, this does
result in tripping of the molded case circuit breaker. The <RESET> button also remains in
the depressed position and is
released. The trip alarm switch (TRIP-IND) operates
however. As soon as the residual current falls below the threshold again, the trip alarm
switch resets immediately (see also table "Scenario C" in chapter "Connecting terminals",
section "Status indicators").
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