Magnum
1812.900A
21
Figure 3-7: Narrow Frame (8-finger) Moving Conductor
Assembl
1. “Toe” (Arcing Contact)
2. “Heel” (Main Contact)
3.3.2 Primary stationary contacts
The primary stationary contact is a combination of two
items (Figure 3-9). One is a conductive pad mounted on
the line conductor which functions as the stationary main
contact. The other is an arc runner, also connected to the
line conductor. The integral arc runner serves a dual
purpose:
• Fixed arcing contact
• Part of the arc chute
Figure 3-8: Standard Frame (12-finger) Moving Conductor
Assembly
1. “Toe” (Arcing Contact)
2. “Heel” (Main Contact)
Figure 3-9: Partial Cross-Sectional View (Shown in Closed
Position)
2
1
1
2
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