15 Nm
25 Nm
15 Nm
15 Nm
25 Nm
15 Nm
15 Nm
15 Nm
15 Nm
Fig. 12
Functional test
• Carry out a few opening and closing operations
with the circuit-breaker disconnected from the
load.
• If required, cut off the power supply to the spring
loading motor. Discharge the spring by closing and
opening the circuit-breaker by means of the
closing and opening pushbuttons.
• Visually inspect the tulip isolating contacts, sliding
surfaces, etc., to make sure that they are properly
lubricated.
• Make sure that the electrical and mechanical
operation of the various devices is correct,
especially the interlocks.
• The screws and nuts are tightened in the factory
and correct tightening is indicated by a coloured
required during the operating life of the circuit-
breaker. However, if the screws or nuts must be
retightened after maintenance, always replace the
screws and nuts and comply with the values
indicated in fig. 12.
Inspection of screw tightening torque
EL Twin - 40 kA actuator
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