Accessories
4.8 Residual current devices
3VA molded case circuit breakers
326
Manual, 04/2015, A5E03603177010-02
Button for setting the response current I
Δn
The response current can be set in 8 steps, ranging from 0.03 A to maximum 5 A. 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.
The factory setting for the response current is 0.03 A.
Button for setting the delay time Δt (RCD520 only)
The delay time on the RCD520 residual current device can be set in 8 steps, ranging from 0
(instantaneous) to a maximum value of 3000 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 tripping delay is 0 ms.
The delay time is not adjustable on the RCD320. The RCD320 always trips instantaneously.
Recommended procedure for setting the response current and the delay time
1.
Switch off the molded case circuit breaker.
2.
Open the transparent protective cover over the setting buttons.
3.
Adjust the setting values for response current and delay time on the residual current
device to the maximum value in each case.
4.
Switch on the molded case circuit breaker.
The LED labeled "ACT" on the residual current device now lights up, the residual current
device is ready.
5.
Reduce the setting for the response current until the LED labeled "AL" lights up.
The residual current is now 30% higher than the response current setting.
6.
By turning the setting button clockwise, set the next higher response current.
The LED "AL" goes out, the correct response current is now set.
7.
Set the required delay time.
8.
Close the transparent protective cover over the setting buttons.
The device is now fully parameterized.
Summary of Contents for 3VA1 100 A
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