Maintenance Operating Mechanism Maintenance
20 1HSB515409-100 en rev2
4.10 Link system and spring battery
Perform a visual check of the spring battery, links and bearings. If necessary,
lubricate the links and bearings with Grease “M”.
4.11 Auxiliary contact
The operating mechanism is fitted as standard with a 6-pole auxiliary contact
consisting of six opening and six closing contacts. Three closing and one opening
contacts are used for the functioning of the operating mechanism.
The auxiliary contact shaft is in direct connection with the operating lever in the
operating mechanism and accordingly follows the movement of the circuit-breaker
contacts.
Figure 4-13. Limit switch with auxiliary contact.
After 15 years or 5,000 operations, check the contact travel by measuring the times
and compare the results with those obtained during commissioning. The comparison
can then be used to check the condition of:
• Contact travel
• Contact damping
Item
1 Limit switch
2 Auxiliary contact
2
1
B20017
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