ABB SACE Emax E2.2 Installation, Operation And Maintenance Instructions For The Installer And The User page 72

Check for wear on the contacts With the circuit-breaker open and springs discharged:
70 | © 2019 ABB | 1SDH001000R0002 - ECN000109166 - Rev. D
1. Remove the arc chutes
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
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.
3
1
2
E2.2 - E4.2 - E6.2
Putting into service and maintenance | 5 - Second level maintenance
ABB | SACE Emax 2
> 1. 4 mm ->OK