Siemens SINOVA - Inspection & Maintenance; Inspecting Arc Chutes, Contacts, and Wear

Inspection & Maintenance
4.4 Performing inspection
3WJ Air Circuit breakers
176 Operating Instructions, 12/2022, L1V30828903001-01
Installation
1. Attach all plugs to the electronic trip unit.
2. Install the electronic trip unti on the breaker.
Note
Make sure that you do not damage the cable harness.
3. Fix the electronic trip unit to the breaker with the corresponding screws.
Test
Note
After the ETU replacement, the Circuit Breaker must be tested with the hand
-
held test device.
You have to perform a CT test and a Trip test.
For more information, refer to the chapter Hand-held test device (Page 86).
4.4.9 Inspection of arc chutes, arc chute covers and main contact system
Check the following items:
• Optical condition of arc chutes as per Chapter Maintaining the arc chutes (Page 180)
• Damage to the arc chute covers on the guide frame (option)
• Main contacts with contact erosion indicator as per Chapter Maintaining the main contact
system (Page 181)