KRB-5368c
-36-
6-2-2. Arc chambers
The following describes how to replace arc chambers.
1) Make preparations for parts replacement. Refer to section 6-2-1.
2) If the ACB is not equipped with the undervoltage trip device, turn the cover mounting screws five or six turns to loosen as shown
in Fig. 23. If the ACB is equipped with side covers, first remove the side covers and then loosen the front cover mounting screws.
(The cover mounting screws are of captive type and cannot be removed from the side and front covers.)
3) Pulling the charging handle down, remove the front cover.
4)
Remove the terminal block fixing screws as shown in Fig. 24, and move the terminal block.
5)
Remove the arc chamber mounting screw as shown in Fig. 28, and remove the arc chamber.
Fig. 28 Removing the arc chamber
6) Reinstall each part or component in reverse order of removal after inspection.
Fig. 29 shows a removed arc chamber.
Fig. 29 Arc chamber
Fig. 30 shows the contacts in closed and open state.
Open state
Closed state
Fig. 30 State of contacts
Arc chambers (3 - 4)
Arc chamber mounting screw
Pan head M6 x 20 (6 - 8)
with spring and flat washers
Tightening torque: 4.7 - 5.9 N·m
Arc extinguishing grids
Arc chamber mounting screw
Stationary contact chip
Moving contact chip
Summary of Contents for TemPower2 AR-E Series
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