Manual

Gossen Metrawatt GmbH 49
Note
Selective RCDs demonstrate delayed response charac-
teristics. Tripping performance is briefly influenced (up to
30 s) due to pre-loading during measurement of touch
voltage. In order to eliminate pre-charging caused by the
measurement of touch voltage, a waiting period must be
observed prior to the tripping test. After the measuring
sequence has been started (tripping test), blinking bars
are displayed for approximately 30 seconds. Tripping
times of up to 1000 ms are permissible. The tripping test
is executed immediately after once again pressing the I
N
key.
12.3.2 PRCDs with Non-Linear Type PRCD-K Elements
The PRCD-K is a portable RCD with electronic residual current
evaluation laid out as an inline device which switches all poles (L,
N and PE). Undervoltage tripping and protective conductor moni-
toring are additionally integrated into the PRCD-K.
The PRCD-K is equipped with undervoltage tripping, for which
reason it has to be operated with line voltage, and measurements
may only be performed in the on state (PRCD-K switches all
poles).
Terminology (from DIN VDE 0661)
Portable protective devices are circuit breakers which can be con-
nected between power consuming devices and permanently
installed electrical outlets by means of standardized plug-and-
socket devices.
A reusable, portable protective device is a protective device which
is designed such that it can be connected to movable cables.
Please be aware that a non-linear element is usually integrated
into PRCDs, which leads to immediate exceeding of the greatest
permissible touch voltage during U
I
measurements (U
I
greater
than 50 V).
PRCDs which do not include a non-linear element in the protec-
tive conductor must be tested in accordance with section 12.3.3
on page 50.
Objective (from DIN VDE 0661)
Portable residual current devices (PRCDs) serve to protect per-
sons and property. They allow for the attainment of increased lev-
els of protection as provided by protective measures utilized in
electrical systems for the prevention of electrical shock as defined
in DIN VDE 0100-410. They are to be designed such that they
can be installed by means of a plug attached directly to the pro-
tective device, or by means of a plug with a short cable.
Measuring Method
The following can be measured, depending upon the measuring
method:
•Time to trip t
A
: tripping test with nominal residual current I
N
(the PRCD-K must be tripped at 50% nominal current)
• Tripping current I

for testing with rising residual current I
F
Select Measuring Function
Connection
Set Parameter – PRCD with Non-Linear Elements
Start Measurement
I
N
I
F
or
Type 1: