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Overhaul Instructions
4. Dismantling the circuit-breaker
4.1 General
4.1.1 Preparations for the overhaul
1HSB435409-201 enrev1
Before the circuit-breaker is dismantled and during the course of the dismantling
work, the directives in the Operating and Maintenance Instructions
1HSB435409-100 must be read and followed:
Check and note down the circuit-breaker's operating values before dismantling.
Any deviation from the recommended values indicates that something must be
carefully checked during the overhaul.
There are two different methods for implementing the overhaul:
•
First and foremost it is recommended that the entire circuit-breaker is
dismantled for transport to a service workshop, where it can be dismantled in
detail for the overhaul.
•
Alternatively, and secondly only the breaking unit is dismantled.
The latter method does not entail so much work, but it may only be used when the
weather is settled and the outdoor working conditions are similar to indoor
conditions.
N. B.
Removal and assembly of the breaking units must not be done when the
weather is such that there is a risk of rain.
This work requires trained staff with product knowledge and may only be
carried out by authorised personnel.
The following must be done before starting the overhaul:
•
Operate the circuit-breaker to the Open position.
•
Isolate and earth.
•
Off-load the spring battery in the operating mechanism by switching off the
motor current and implementing a Close-Open operation.
•
Switch off the control voltage and, if necessary, also the heater power.
Dismantling the circuit-breaker
WARNING
9
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