Inspection & Maintenance
4.6 Maintaining the arc chutes
3WJ Air Circuit breakers
180 Operating Instructions, 12/2022, L1V30828903001-01
4.6 Maintaining the arc chutes
Damage to the arc chutes
If the disassembled chutes are set down in the vertical position, the insulating walls of the
arc chutes can be damaged.
Always lay arc chutes on their sides.
1. Remove the arc chute
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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