Siemens 3VA1 100 A Manual page 322

Accessories
4.8 Residual current devices
Description of front panel view
Display elements
"Ready" signals and alarms
● "Ready" signal of the residual current device:
The LED labeled "ACT" stands for ACTIVE and lights up when the device is ready to
operate.
● Pre-alarm:
Both the Basic RCD320 and the Basic RCD520 feature an alarm LED labeled "AL" (pre-
alarm) which lights up promptly to indicate potential shutdown of the installation due to
residual current.
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3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02