KRB-5404
91
6-2-5 Latch release coil (LRC)
The following describes how to replace the latch release coil (LRC).
1) Make preparations for parts replacement. Refer to section 6-2-1.
2) If the ACB is not equipped with the fixed type undervoltage trip device, turn the cover mounting screws five or six turns to
loosen as shown in Fig. 69. 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 contact block fixing screws as shown in Fig. 70.
5) Flip the contact block up as shown in Fig. 71.
6) Turn the LRC mounting screws eight or ten turns to loosen, disconnect the manual connector (green), and then remove the LRC.
See Fig. 84.
Fig. 84 Removing the LRC
7) Reinstall each part or component in reverse order of removal after inspection. When installing the LRC, make sure the
nameplate on the LRC can be viewed from the front of the ACB.
Fig. 85 provides the general view of the LRC.
Fig. 85 General views of LRC
LRC
Contact block
Hand connector (green)
LRC mounting screw,
Pan head M4 × 80 (2)
with spring washer
Tightening torque: 1.3 - 1.7 N·m
Plunger
Coil resistance measuring point
Hand connector (green)
LRC mounting screw
Moving core
(located in the center hole)
Plunger length measurement
