User guide

2010-06-07 S47183e rev.03 Design and specifications are subject to change without notice 45
D) Changing the arcing contact
• Remove front and back arc runner. See 6.2.2-C.
• Close the breaker and secure the solenoid drive against
unintended opening. See 1.2.2.
• Secure the contact area against parts falling inside
the breaker. See 1.2.1.
• [Fig. 52-1]. Initially loosen two braid’s screws with tool,
and unbolt them finally by hand.
• [Fig. 52-2]. Remove the safety ring from axis pin end.
• [Fig. 52-3]. Pull out the axis pin from contact.
Fig. 52-1 Unscrew cooper braid
Fig. 52-2 Remove safety ring
Fig. 52-3 Remove axis pin
• [Fig. 52-4]. Replace arcing contact with new one. Use old
contact to lift up two washers, and slip the new contact
under these. Remove old contact and rotate the new one
by 180 ° to its normal orientation.
• [Fig. 52-2/3]. Re-install the axis pin and safety ring.
• [Fig. 52-5]. Initially screw in braid’s screws by hand.
• [Fig. 52-6]. Tighten these by torque of 10 Nm [88 in-lbs].
• Install back the arc runners. See 6.2.2-C.
• Check the adjustments according to point 6.1.5-C.
• Install back adapter and arc chute. See 6.2.1-D/E.
Fig. 52-4 Replace arcing contact
Fig. 52-5 Tighten braid’s screws by means of hand
Fig. 52-6 Tighten braid’s screws with torque of 10Nm