Megabreak® - Maintenance guide
M
ain
tenanc
e guide
71
Problem
Possible causes
Checkup & resolution
Notes
It’s not possible to
charge manually
the springs
The springs charging
gear is damaged
Check the integrity
of the lever and
the mechanism. If
necessary replace it
(spare parts). If the
problem persists,
contact BTicino
Mechanism jammed
Follow the mechanism
maintenance
procedures MCH. If
the problem persists,
contact BTicino
Unexpected trips
Trip for real
overcurrent
Check the type of trip
event by consulting
the display of
Protection Unit
Trip by UVR or Shunt
Trip
Check their power
supply circuit.
Check
UVR is supplied with
V>0,85Vn
Wrong settings of
protection unit
Set correctly the
protection values of PU
Malfunctioning of
protection unit
Contact BTicino
The breaker
doesn’t trip in case
of over-current
Disconnection
between CT
and trip Unit
The breaker must be
able to trip by test
button.
Check that PU shows
correct current on
display.
Check the connector
showed in picture. If
necessary connect it
correctly.
Check the CT integrity
and if necessary replace
them (spare parts)
Trip coil doesn’t
operate
The breaker must not
be able to trip by test
button. (if test button
work, the problem is
not on trip coil). Check
the trip coil seal.
If seal is broken or if
the problem persists,
contact
BTicino
Defect of electronic
Trip Unit
Check if PU can be
turned on with correct
supply. Check trip unit
with test device box.
If the problem persists
contact BTicino