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Recommended hand tools
Metric hardware is used on these circuit
breakers.
The following list of hand tools describes
those normally used in disassembly and
re-assembly procedures:
Open-end wrenches: 3, 5.5, 7, 8, 10, 13,
17, 19 and 24 mm
Sockets: 7, 8, 10, 13 and 17 mm
Socket: 36 mm (used for replacing post
insulators (16.1))
Deep sockets: 19 and 24 mm
Hex keys: 5, 6, 8 and 10 mm
Torque wrench: 0-150 Nm
(0-100 ft-lbs)
Screwdrivers: 0.032 x 1/4 in wide and
0.055 x 7/16 in wide
Pliers
Light hammer
Mechanic’s mirror
Flashlight
Drift pins: 1/8, 3/16 and 1/4 in
Retaining ring plier (external type, tip
diameter 0.038 in).
Recommended maintenance and
lubrication
Periodic maintenance and lubrication should
include all the tasks shown in Table 2.
Recommended procedures for each of the
listed tasks are provided in this section of
the instruction manual.
The list of tasks in Table 2: Maintenance
tasks does not represent an exhaustive
survey of maintenance steps necessary to
ensure safe operation of the equipment.
Particular applications may require further
procedures. Should further information be
desired or should particular problems arise
that are not covered sufficiently for the
user’s purposes, the matter should be
referred to the local Siemens sales office.
Checks of the primary power path
The primary power path consists of the
three vacuum interrupters, the three fixed-
end and three moving-end connections to
the enclosure bus system. These
components are checked for cleanliness and
condition. The vacuum interrupters are also
checked for vacuum integrity.
The contact erosion check is performed with
the contacts in the vacuum interrupter
(30.0) in the CLOSED position.
The vacuum-integrity check is usually
performed in conjunction with the high-
potential tests.
Inspection items and test
s
Primary-power path checks
Cleanliness check
Inspection of flexible connectors
Magnetic-actuator operator-mechanism checks
Maintenance and lubrication
Fastener check
Capacitor charging check
Contact-erosion check
Electrical-control checks
Wiring and terminals checks
Capacitor charging check
Electrical close and trip check
Vacuum-integrity check
High-potential test
Insulation test
Contact-resistance test
Inspection and cleaning of circuit breaker insulation
Functional tests
Table 2: Maintenance tasks
