Overhaul Instructions
Contact and puffer replacement
1HSB435409-201 enrev1 17
6. Contact and puffer replacement
If the circuit-breaker is not going to be reassembled immediately after the cleaning
of the component parts, protect them against contamination and moisture by
packing them in plastic bags with a desiccant to absorb moisture.
The insulators are suitably protected by tying heavy-duty plastic sheet over the end
surfaces.
Inspect the upper and lower current paths and the puffer in as described below. If
any component is burnt or worn and is replaced, replace also the other components
at the same time.
6.1 Inspection of the upper current path
Replace the entire current path with flange and puffer if the upper current path’s
fixed arcing contact, Figure 6-1, has been burnt so that the distance to the reference
surface is more than 6 mm or if the outside surface has been severely burnt. Replace
also the upper current path if the silver on the current path’s contacts is worn so that
copper is visible.
Tighten the bolts (2). Tightening torque 22.5 Nm.
Figure 6-1. Upper current path
Item
1 Flange
2 Bolt M8x20
Retaining washer
Washer
3 Current path
4 Arcing contact
1
3
4
B10060
Reference surface
2
max. 6 mm
TIGHTENING TORQUE
22.5 Nm
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