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ZB65-.../XTOB…DC1 and
ZB150-.../XTOB…GC1
overload relays
42
09/15 MN03407005Z-DE/EN
Temperature compensation
Two parameters influence the deflection of the bimetallic
releases: Firstly, the heat which is generated in proportion to
the current flow, and secondly, the ambient air temperature.
The influence of the ambient air temperature is automati-
cally 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 failure
The ZB…/XTOB… overload relays are phase failure sensi-
tive. The deflecting action of all three bimetallic releases is
directed towards a tripping bridge that switches over a snap-
action 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 5:
Function of the phase failure sensitivity by means
of tripping and differential bridge
a
Trip bridge
b
Differential bridge
c
Differential travel
s = Tripping distance
Normal operation
(no fault)
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 ZB65 Series
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