Device description
35
05/05 AWB2300-1527D/GB
Temperature compensation
Two parameters influence the deflection of the bimetallic
releases. There is for one the heat which is generated in
proportion to the current flow, and secondly, the influence of
the ambient temperature.
The influence of the ambient temperature is automatically
compensated within a temperature range from -5 °C to
+55 °C by means of an additional current-free bimetallic
release that continuously corrects the tripping range.
Phase loss
ZB12 and ZB32 overload relays are single-phasing sensitive.
The deflecting action of all three bimetallic releases is
directed towards a tripping bridge that switches over a
quick-break switch when the limit value is reached. At the
same time, all three bimetallic releases shift the differential
bridge. If the path of action of one of the bimetallic releases
is reduced due to a phase loss, the differential bridge is
retarded and the distance is converted into an additional
tripping distance, which leads to an early tripping.
Figure 4: Function of the phase sensitivity by means of tripping
and differential bridge
a
Tripping bridge
b
Differential bridge
c
Differential distance
s = Tripping distance
Normal error-free
operation
3-phase overload
Failure of one phase
(two-phase load)
97
S
95
98 96
97 95
98 96
97 95
98 96
햲
햳
햴
Содержание ZB12 Series
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