Tripping characteristics
37
10/13 MN03402007Z-DE/EN
Tripping CLASS
The ZEB overload relay is suitable for both normal startups
as well as for heavy duty starting. The CLASS setting enables
a particular tripping characteristic to be selected. These are
the following:
• CLASS 10A and CLASS 10 = normal startups,
• CLASS 20 and CLASS 30 = heavy to very heavy starting.
h
With ZEB variants with ground fault detection
(ZEB-…-GF…) only the selection between CLASS 10 and
CLASS 20 is available.
Danger!
The motor, the wiring diameter and the switching device
must be suitable for the selected tripping CLASS.
Danger!
The current-dependent protective device must be selected
so that not only the motor current is monitored but also
the blocked motor is switched off within the temperature
rise time t
E
(see the following example).
