Motor-protective circuit-
breaker PKE12 and PKE32
42
06/10 MN03402004Z-DE/EN
Table 2:
Overload protection for heavy starting duty
Phase failure
The PKE motor-protective circuit-breakers are phase failure
sensitive.
On phase failure, for example due to an imbalance of or
above 50 percent, the tripping time drops to about 40
percent of the three-phase tripping value.
Figure 6: Wiring the motor-protective circuit-breaker for
protecting AC motors (series connection of the overload
releases)
CLASS
Rated operational current I
e CLASS
[A]
5
I
e
10
I
e
15
1.22 x I
e
20
1.41 x I
e
h
If a PKE relay is to monitor an AC motor, the current must
be fed on all three poles in order to prevent early tripping.
i
Warning!
DC motors cannot be monitored.
Summary of Contents for PKE12 Series
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