36 Design and specifications are subject to change without notice 01/2008
6. Inspections and maintenance
6.1 List of inspections
TYPE OF THE INSPECTION BY WHOM HOW OFTEN WHAT TO DO/CHECK
A. General visual inspection Customer.
Trained technician.
Every 6-12 months
• Check out damages or cracks of the
frame, adapter or arc chute
• Check out for missing screws or caps
• Check out for deglutinated labels
• Check out for corrosion
• Check out distinct manifestations of
flame or smoke at the frame
• Clean the breaker from dirt and dust
• Clean and degrease the cooper ter-
minals
B. General functional in-
spection
Customer.
Trained technician.
Every 6-12 months
• Close and open manually the breaker
to check the drive and mechanism
• Close the breaker electrically and
open by trip unit(s) releasing, to check
controls
C. Inspection of the arc
chute and contact system
Customer.
Trained technician.
Every 6-12 months
OR after:
• high short circuit open-
ing at >25kA
• >300 openings at load
current
• >100 openings at over
current load (2-3 *In)
• Check out wear of the arc runners;
shall not exceed 30% of its cross sec-
tion
• Check out wear of the pre-arcing
contact. It shall not exceed 2mm
[0,08in].
• Check out wear of the main contacts
at fix and flexible side; shall not ex-
ceed 1mm [0,04in] of its depth.
• Check out wear of the arc chute’s
plates; check out for deposits inside
of arc chute, this area shall be free of
deposits.
• Check out wear of protective walls;
shall not exceed 1mm [0,04].
• Check out contacts’ tilt and gaps.
D. Inspection of the screw
connections
Customer.
Trained technician.
Every 6-12 months
OR after every inspection:
• of the arc runners
• of the contacts
• of the arc chute
Check out position of the countersunk
screws in the sidewalls.
Check for tight fitting or use torque tool
(torque in SI and Imperial units):
• M8 ~20Nm [~ 177 lbf*in]
• M6 ~10Nm [~ 88 lbf*in]
• M5 ~5Nm [~ 44 lbf*in]
• M4 ~3Nm [~ 26 lbf*in]
E. Inspection of the me-
chanic components
GE.
Service technician.
Every 5 years
OR
After 5.000 openings
• Carry out inspection B
• Check out settings of contacts and
auxiliary switches
• Check out upper dumper of the
mechanism; no cracks, deformation
or heavy discolouration; hard consis-
tency; without punctures
• Check out main flexband breakage;
shall not exceed 30% of its cross sec-
tion
• Check out wear of mini flexband; shall
not exceed 30% of its cross section
Table 3
Required tools:
Cleaning tissue, pocket lamp, hand lever, hexagon wrench SW5, SW6, small and medium screwdriver.
To Next Page
Loading...
Need help?
General
