Description Of Device; Overload Protection With Motor-Protective Circuit-Breakers; Current Ranges Of The Pkzm4; Motor-Protective Circuit-Breakers - Eaton PKZM4/XTPR DC1 Series Manual

1 PKZM4-.../XTPR...DC1 motor-protective circuit-breakers

1.3 Description of device

1.3 Description of device

1.3.1 Overload protection with motor-protective circuit-breakers

1.3.2 Current ranges of the PKZM4-.../XTPR...DC1 motor-protective circuit-breakers

1.3.3 Temperature compensation

20
The PKZM4-.../XTPR...DC1 series are 3 pole electromechanical motor-
protective circuit-breakers with bimetallic release for overload monitoring.
The PKZM4-.../XTPR...DC1 switch disconnects all phases from the mains
circuit when an overload occurs. The current flow to the monitored motor is
thus switched off directly (a see figure 2).
L1 L2 L3
-Q1
I > I > I >
T1 T2 T3
Figure 2: Circuit diagram of the
PKZM4-.../XTPR...DC1 motor-protective circuit-breakers
The rated motor current is set on the PKZM4-.../XTPR...DC1 units by means
of a current dial a (￫ figure 1, page 19).
Seven different types can be used to monitor motors operating at a rated
motor current of 10 to 63 A (￫ table 1).
Table 1: Current ranges of the
Type
PKZM4-... XTPR...DC1
PKZM4-16 XTPR016DC1
PKZM4-25 XTPR025DC1
PKZM4-32 XTPR032DC1
PKZM4-40 XTPR040DC1
PKZM4-50 XTPR050DC1
PKZM4-58 XTPR058DC1
PKZM4-63 XTPR063DC1
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 air temperature. The influence of the
ambient air temperature is automatically compensated within a temperature
range from -5 to +55 °C by means of an additional current-free bimetallic
release that continuously corrects the tripping range.
PKZM4-.../XTPR...DC1 11/16 MN03402002Z-DE/EN www.eaton.com
PKZM4-.../XTPR...DC1
Current range I
e
A
10 - 16
16 - 25
24 - 32
32 - 40
40 - 50
50 - 58
55 - 63