Datasheet

ESG 5.21
Connection
Dimensions
Loss of neutral wire by means of evaluation of asymmetry
A break of the neutral wire between power line and machinery is
detected as soon as asymmetry between phase-to-phase voltage
and neutral wire occurs. If the asymmetry exceeds the value set at
the ASYM-regulator, the set interval of the tripping delay (DELAY)
begins (red LED ASYM flashes). After the interval has expired (red
LED ASYM illuminated), the output relays switch into off-position
(yellow LED not illuminated). A break of the neutral wire between
our device and the machinery can not be detected.
L3 L2
L1
N
Shift of the star-point (asymmetry)
through unequal phase-load with
missing neutral wire
3-phase voltage monitoring relay (Multifunction)
EMR SU31C1, SU31D1
51
38
80
4713 20
9 10 11 1 2 3
8 7 6 5 4
L3
L2 L1N
Measuring range 3 (N) 400/230 Vac
Supply voltage = measuring range