KRB-5404
93
6-2-7. Control relay
The following describes how to replace the control relay.
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) If the ACB is equipped with the ON-OFF cycle counter, disengage the hook located under the cycle counter spring, turn the
cycle counter fixing screw two or three turns to loosen (do not remove), and flip the cycle counter up to the upper right direction.
See Fig. 88.
Fig. 88 Flipping the ON-OFF cycle counter
5) Unscrew the OCR mounting screws and remove the wiring from the wire tie. See Fig. 89.
Fig. 89 OCR and related parts
ON-OFF cycle counter fixing
screw
Pan head M5 × 10
with spring and flat washers
Tightening torque: 2.7 - 3.5 N·m
ON-OFF cycle counter
(flipped to the upper right
direction)
OCR mounting screw
ON-OFF cycle counter spring
Hook
Wire tie
Wiring
OCR
OCR mounting screw,
Pan head M5 × 12 (2)
with spring and flat washers
Tightening torque: 2.7 - 3.5 N·m
OCR mounting screw
