Measuring
41
Function
Display Meaning Notes
No measurement
possible, Fl circuit
breaker has tripped
during pre-testing in
Phase 1
Fl circuit breaker defective,
trips at less than 50% I
∆N
High leakage currents in
system + pre-testing current
trip Fl circuit breaker.
Incorrect test current set
No measurement
possible, Fl circuit
breaker has tripped
during pre-testing in
phase 2.
Leakage current in system +
50% I
∆N
trip Fl circuit
breaker defective, trips at
less than 50% I
∆N
.
Fl circuit breaker failed
to trip at I
∆N
within 200
ms
Fl circuit breaker defective or
misconnected. Possibly
repeat selective Fl test with
S
Fl. Incorrect test current
set. Insulation fault between
zero wire and PE.
Early tripping in phase
1 or 2
Fl circuit breaker defective,
trips at less than 50% I
∆N
Leakage currents in system +
50% I
∆N
.
Contact voltage > 50 V,
hence no tripping test.
Earthing / grounding too high,
incorrect test current
selected.
Fl-Circuit
Breaker Test
Fl
A
Early tripping in phase
1
Incorrect test current
selected, bias loads in
network (e.g. fault currents)
Contact voltage > 100
V, hence no
computation possible
and no tripping test.
Earthing / grounding too high,
possibly incorrect test current
selected
A
Overrange Incorrect range selected or
earthing / grounding
resistance greater than 10
kΩ
Measure-
ment of
earthing /
grounding
resistance
R
A
No measurement
possible
Measuring circuit interrupted
(e.g. Fl has tripped)
Legend: = flashing display
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