2 Design
2.5 Overload indicator
18
PXR Electronic trip unit
01/21 MN012005EN
www.eaton.com
2.5 Overload indicator
PXR10, PXR20
The PXR10 and PXR20 trip units are equipped with an orange overload LED
for load and overload warnings, which are triggered at 85 % (LED on) and
105 % (LED flashing) of I
r
, respectively. Once the current has dropped below
the threshold again, the indicator will switch off or return to its previous
state. The threshold values are fixed.
PXR25
On the PXR25 trip unit, the threshold values for load and overload warnings
can be adjusted via the LCD display.
2.6 Tamper-proof cover
The NZM digital circuit breaker is equipped with a transparent plastic cover.
When this cover is closed, the settings can be displayed but not changed. In
order to comply with the applicable tamper-proof requirements, any
unauthorized changes to the settings can be prevented by inserting a
standard seal into the safety hole.
On the PXR25 trip unit, the protection settings are additionally password
protected. The PXR25 trip unit cover features openings above the up and
down arrow keys. This makes it possible to view the “screensaver” display
and the values it depicts. The enter button cannot be pressed while the cover
is closed. It is therefore not possible to switch from the screensaver to the
main menu while the cover is closed.
