Hitachi H20-T - Page 44

40
The 3-element thermal overload relay is so adjusted that it can normally operate in a state where current flows to
all 3 elements.
In the case shown in Fig. 41, the protection characteristic is deteriorated.
The protection characteristic indicates a deviation of 12% in the worst case as shown by the dotted line in Fig. 42.
Fig. 42 Operating characteristic in wrong connection