PKZM4/XTPR…DC1 motor-
protective circuit-breakers
28
01/11 MN03402002Z-DE/EN
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 3:
Function of the phase sensitivity by means of
tripping and differential bridge
a
Trip bridge
b
Differential bridge
c
Distance
d
Differential travel
Figure 4:
Wiring of the motor-protective circuit-breaker for
the protection of AC or DC motors (bimetallic
release switched in series)
(
section "Typenschild/Rating plate PKZM4/XTPR…01“
on page 41)
ab
c
d
e
f
g
ON
ON
OFF
three-phase
overload
Normal error-
free operation
Failure of one phase
(two-phase load)
h
When a PKZM4/XTPR…DC1 is to be used for monitoring
an AC or DC motor, the current must flow across all three
current paths in order to avoid early tripping.
Summary of Contents for PKZM4/XTPR DC1 Series
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