ABB | SACE Emax 2
70 | © 2019 ABB | 1SDH001000R0002 - ECN000109166 - Rev. D
Putting into service and maintenance | 5 - Second level maintenance
Check for wear on the contacts
With the circuit-breaker open and springs discharged:
1. Remove the arc chutes
3
2
1
Figure 93 - 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 slags 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. mm ->OK
4
Figure 94 - 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.
