6-2-3. Stationary contact The following describes how to replace the stationary contact. Fig. 69 shows the general view around the stationary contact.
Main circuit contact Stationary contact Mold base
Stationary contact tip
Moving contact tip
Engagement measuring hole 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 Insulated operating rod
Stationary contact mounting screw B, Pan head M6 × 20 (12-32) with spring and flat washers Tightening torque: 4.7 - 5.9 N·m
Stationary contact mounting screw A, Pan head M6 × 30(12-32) with spring and flat washers Tightening torque: 4.7 - 5.9 N·m Fig. 69 General view around the stationary contact
1) Make preparations for parts replacement. Refer to section 6-2-1. 2) Unscrew the current sensor mounting screws and remove the current sensor and the power supply CT located behind the sensor. Take care not to exert undue force on the control wire between the current sensor and the power supply CT. To remove the current sensor, hold the top of the sensor, then tilt and pull it out in a slanting direction as shown in Fig. 70. Stationary contact mounting screws A, Pan head M6 × 30 (12-32) with spring and flat washers Tightening torque: 4.7 - 5.9 N·m
Current sensor mounting screws, Pan head M4 × 12 (6-16) with spring and flat washers Tightening torque: 1.3 - 1.7 N·m
Engagement measuring hole (marked with while line)
Current sensor
Allen wrench holes (marked with while lines)
Stationary contact mounting screws B, Pan head M6 × 20 (12-32) with spring and flat washers Tightening torque: 4.7 - 5.9 N·m Removing the current sensor Fig. 70 Stationary contact
3) Unscrew stationary contact mounting screws A and B.
KRB-5268b
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