User Manual

50 GMC-I Messtechnik GmbH
8.10 Measuring Time to Trip for RCDs of the Type PRCD – tA
t
A
Single measurements, rotary switch level: green
Switch Position
Measuring Functions Measurement
Type,
With Mains 
to Test Socket
t
A
ta PRCD time to trip for 30 mA PRCD
U
LN
Line voltage at the test socket
Schematic Diagram
Wiring Diagram
Definition
According to DIN VDE 0100-600:2008, substantiation must be
provided that the RCCB is tripped within the time span defined by
DIN VDE 0100-410.
PRCD Portable residual current device
Applications
The PRCD under test is plugged into the test socket at the test
instrument. The PRCD’s phase conductor must be contacted
with test probe P1 in order to trip the PRCD.
Note
The testing of PRCDs (test sequences and time to trip) is
only possible for DUTs with a nominal voltage of 230 V.
Note
Measurement of time to trip is not possible in IT systems.
Test Sequence
➭ Set the rotary switch to the t
A
position.
➭ P
lug the PRCD into the test socket at the test instrument and
connect the test probe to P1.
➭ Start the test: press the START/STOP key. 

➭ Ac
knowledge the warning which indicates that line
voltage will be connected to the test socket.

Execute the following steps when prompted to do so:
Note
Please note that test probe P1 is in continuous contact
with the phase conductor from the point in time at which
the PRCD is plugged in until it trips. Premature discon
-
nection of the test probe may result in erroneous mea-
sured values.
➭ After each reconnection to the mains, and as soon as the first
test is started, a mains connection test is executed.
➭ If the probe test has revealed that probe P1 was not con-
nected: connect probe P1 as described above.
➭ Swi
tch the PRCD on after connection to line voltage (e.g.
reset button on PRCD).
➭ Co
ntact neutral conductor L at the PRCD with test probe P1
(ascertain by trial and error if necessary).
➭ The test is automatically ended and time to trip is displayed
after the PRCD is tripped.
➭
The save symbol appears and prompts you to save the
measured values to an ID number.
➭ P
ress the ESC key in order to discard the measured
values stored to buffer memory and acknowledge by
pressing the key shown at the right.