ABB DW Series User Manual page 42

HOUR COUNTER MENU
"Hour counter" menu allows you to display the hours of use (relay on) of connected loads.
The maximum value of the counter is 99999 hours (about 11 years); reached the maximum limit, the counter resets automatically.
To reset a counter:
1. select the desired channel (only for DW2)
2. press the key
for 3 seconds until the display shows " "
3. confirm by pressing (press to exit without zeroing)
Note: it's possible to reset all counters contemporary from the "Reset" menu (see page 40).
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User manual DW