Temperature Compensation; Phase Failure - Eaton PKZM4/XTPR DC1 Series Manual

01/11 MN03402002Z-DE/EN
Current ranges 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 (a fig. 1, page 26).
Seven different types can be used to monitor motors
operating at a rated motor current of 10 to 63 A
(a table 1).
Table 1: Current ranges of the
Part no.
PKZM4-16 XTPR016DC1
PKZM4-25 XTPR025DC1
PKZM4-32 XTPR032DC1
PKZM4-40 XTPR040DC1
PKZM4-50 XTPR050DC1
PKZM4-58 XTPR058DC1
PKZM4-63 XTPR063DC1

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 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 addi-
tional current-free bimetallic release that continuously
corrects the tripping range.

Phase failure

The PKZM4/XTPR...DC1 motor-protective circuit-breakers
are phase failure sensitive. The deflecting action of all three
bimetallic releases is directed towards a tripping bridge that
Description of device
PKZM4/XTPR...DC1
Current range I
10 - 16
16 - 25
24 - 32
32 - 40
40 - 50
50 - 58
55 - 63
[A]
e
27