Inspection and maintenance
5.6 Maintaining the arc chutes
3WA1 air circuit breaker
404 Equipment Manual, 02/2023, 92310000002-06
1. Remove the arc chute.
– Standard arc chute:
– High arc chutes:
2. Perform a visual inspection for severe wear.
Wear is indicated by burnout on the arc quenching plates or holes in the side walls of
the arc chutes.
3. If you detect sever wear, such as burnout or holes, you must replace the arc chute.
Please refer to the table of article numbers below when reordering.
4. Install the arc chute in the reverse sequence to removal.
Tighten the screw with a tightening torque of 8 Nm.
5. Reset the operating cycles counter in the electronic trip unit after replacing the arc
chutes.
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