Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
435
Button for setting the response current I
Δn
The response current can be set in 8 steps, ranging from 0.03 A to 0.3 A for type B+ and
0.03 A to maximum 5 A for type B (for detailed information, see "Overview of selection
settings in conjunction with I
Δn
"). Each response current has a dedicated setting range. The
corresponding response current is set as soon as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device is
automatically set to 0.03 A for safety reasons.
If the response current is set to 0.03 A, the delay time setting is deactivated and the breaker
is tripped instantaneously. in order to afford personal protection in the case of direct contact.
Note
In order to protect personnel, it is necessary to seal the transparent protective cover so that
the 30 mA setting range cannot be changed.
The factory setting for the response current is 0.03 A.
Button for setting the delay time Δt
The delay time on the RCD520B residual current device can be set in 10 steps, ranging from
0 (instantaneous) to a maximum value of 10000 ms.
Each delay time has a dedicated setting range. The corresponding delay time is set as soon
as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device
trips instantaneously in response to residual currents.
The factory setting for the delay time is 0 ms.