9 – 2
9.1.2 Trip unit ETU745
Overview
1) The trip cause is stored internally for at least two days if the trip unit has been activated for at least 10 min before tripping
(for unlimited time with auxiliary power).
2) Changeover switch only accessible with removed module.
NOTICE
Electrostatic Discharge
Trip unit may become inoperative.
Before the protective cover is removed, ensure that the equipment to be connected, and also the operating
personnel, are at the same potential.
Option: Ground-fault module
Mechanical RESET
for Bell Alarm
Rating plug
Scroll up
Indications
COMMUNICATIONS
EXTENDED
Rotary coding switch
instantaneous pickup setting
Rotary coding switch ground-fault
pickup setting
Rotary coding switch ground-fault
alarm setting
Query button
Te s t b u t t o n
Option: Reset Lockout
prevents accidental resetting of the lock-out
mechanism after a trip
Option: Alphanumeric display
Thermal memory On/Off
Neutral conductor protection On/Off
Neutral conductor overload setting
Overload trip curve mode I
2
t / I
4
t
Rotary coding switch long-time delay setting
Rotary coding switch short-time delay setting
Trip cause indicator
1)
Indications
Ground-fault alarm
Ground-fault tripped
Rotary coding switch ground-fault time
delay setting t
g
/ I
2
t
g
Clear button
Test connector
Trip unit error indicator
Changeover switch ground-fault detection mode
2)
Rotary coding switch long-time
delay pickup setting
Rotary coding switch short-time
delay pickup setting
Scroll down
Trip unit
Overcurrent alarm
activated
Sealing eyelet
and remote trip
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