METREL EurotestCOMBO MI 3125 User Manual

MI 3125 / BT EurotestCOMBO Measurements
37
5.4 Testing RCDs
Various test and measurements are required for verification of RCD(s) in RCD protected
installations. Measurements are based on the EN 61557-6 standard.
The following measurements and tests (sub-functions) can be performed:
 Contact voltage,
 Trip-out time,
 Trip-out current,
 RCD autotest.
See chapter 4.1 Function selection for instructions on
key functionality.
Figure 5.16: RCD test
Test parameters for RCD test and measurement
TEST
RCD sub-function test [RCDt, RCD I, AUTO, Uc].
I
N
Rated RCD residual current sensitivity I
N
[10 mA, 30 mA, 100 mA, 300 mA,
500 mA, 1000 mA].
type
RCD type AC, A, F, B*, B+*, starting polarity [ , , , ,
*, *
],
selective
S
or general characteristic.
MUL
Multiplication factor for test current [½, 1, 2, 5 I
N
].
Ulim
Conventional touch voltage limit [25 V, 50 V].
* Model MI 3125 BT
Notes:
 Ulim can be selected in the Uc sub-function only.
 Selective (time delayed) RCDs have delayed response characteristics. As the
contact voltage pre-test or other RCD tests influence the time delayed RCD it
takes a certain period to recover into normal state. Therefore a time delay of 30 s
is inserted before performing trip-out test by default.

METREL EurotestCOMBO MI 3125 Specifications

General

Brand	METREL
Model	EurotestCOMBO MI 3125
Category	Measuring Instruments
Language	English