Current Ranges For Ze/Xtom Relays; Temperature Compensation; Phase Failure - Eaton ZE serie Handbuch

1 ZE/XTOM overload relays
1.3 Description of device

1.3.2 Current ranges for ZE/XTOM relays

1.3.3 Temperature compensation

1.3.4 Phase failure

28
The overload relays are set to the rated current of the motor by means of a
current setting dial (￫ fig. 1 on page 26).
11 types enable the monitoring of motors with rated motor current from
0.1 to 12 A (a following table 2).
Table 2: Current range of ZE/XTOM motor overload relays
Type
ZE-... XTOM...
ZE-0.16 XTOMP16AC1
ZE-0.24 XTOMP24AC1
ZE-0.4 XTOMP40AC1
ZE-0.6 XTOMP60AC1
ZE-1.0 XTOM001AC1
ZE-1.6 XTOM1P6AC1
ZE-2.4 XTOM2P4AC1
ZE-4 XTOM004AC1
ZE-6 XTOM006AC1
ZE-9 XTOM009AC1
ZE-12 XTOM012AC1
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 automatically compensated
within a temperature range from -5 to +50 °C by means of an additional
current-free bimetallic release that continuously corrects the tripping range.
ZE/XTOM overload relays are phase-failure sensitive.
The deflecting action of all three bimetallic releases is directed towards a
tripping bridge that 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.
ZE/XTOM 11/17 MN03407003Z-DE/EN www.eaton.com
Current range I
e
A
0.10 - 0.16
0.16 - 0.24
0.24 - 0.4
0.4 - 0.6
0.6 - 1.0
1.0 - 1.6
1.6 - 2.4
2.4 - 4
4 - 6
6 - 9
9 - 12