ABB SACE Emax 2 Series - Check for Wear on the Contacts

ABB | SACE Emax 2
Putting into service and maintenance | 5 - Second level maintenance
263 | © 2013 ABB | 1SDH001000R0002 - L7804
Check for wear on the contacts
With the circuit-breaker open and springs discharged:
1. Remove the arc chutes
3
2
1
Figure 106 - Removing the arc chutes
2. Check the condition of the arc-breaking chutes: the base of the chute must be
undamaged and the plates must be neither corroded nor indented.
3. Remove the dust with compressed air, then clean off all traces of fumes and slag with
a brush.
4. Make sure that the contacts are in good condition.
5. Visually check to make sure that the main and arc-breaking plates are in place.
6. Check for tarnishing or beading. If such defects are discovered, ask for assistance from
a qualified ABB Technician (*).
7. Check the arc-breaking gaps (distance A).
A
E2.2 - E4.2 - E6.2
> 1,5 mm ->OK
Figure 107 - Checking the breaking gaps
8. Close the circuit-breaker and check dimension A. Contact ABB Sace (*) if dimension A
is incorrect. If dimension A is correct, open the circuit-breaker again and re-assemble
the arc chutes.
NOTE: (*) After approval from the customer, ABB can proceed with replacement of
the worn parts.