KRB-5404
89
6-2-4. Moving contact
The following describes how to replace the moving contact.
1) Make preparations for parts replacement. Refer to section 6-2-1.
2) Remove the arc chambers and stationary contact. Refer to sections 6-2-2 and 6-2-3.
3)
Insert an Allen wrench of a nominal diameter of 5 into each of the Allen wrench holes shown in Fig. 79, turn each moving
contact mounting screw two or three turns to loosen, and raise and remove the upper separator shown in Fig. 82.
Removing/installing separator
Fig. 82 Moving contact
4) Supporting the spacers (the number of which varies depending on the poles), the moving contact, the lower separator, and the
moving contact mounting screws by hand, turn the moving contact mounting screws additional two or three turns to remove
these parts. Fig. 83 shows the moving contact-related parts.
Fig. 83 Moving contact-related parts
Moving contact mounting screw,
Hex. socket head M8 × 30 (6-16)
(M8 × 25 for AR208S only)
with spring washer
Tightening torque: 14.7 N·m
Moving contact tip
Moving contact
Spacer
Insulated operating rod
Upper separator
Lower separator
Lower separator
Upper separator
Moving contact mounting screw
Moving contact
(When pursuant to ship
classification society rules)
Spacer
Moving contact
Moving arcing contact mounting
nut with M5 spring washer
Tightening torque: 2.7 – 3.5 N·m
Moving arcing contact
