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Distribution Systems: Switches

Switches
Distribution systems have switches installed at strategic locations to redirect or cut-off power flows for load balancing or sectionalizing. Also, this permits repairing of damaged lines or equipment or upgrading work on the system. The many types of switches include:
  • circuit-breaker switches
  • single-pole disconnect switches
  • three-pole group-operated switches
  • pad-mounted switchgear
Figure 1. Air circuit-breaker switches
Figure 1. Air circuit-breaker switches

 Figure 2. Air-break isolator switch
Figure 2. Air-break isolator switch
Figure 3. Circuit switchers
Figure 3. Circuit switchers 		Figure 4. Single-pole disconnect switch combined with a fuse is called a fused cutout
Figure 4. Single-pole disconnect switch combined
with a fuse is called a fused cutout
 
Figure 5. Circuit breakers
Figure 5. Circuit breakers
 		 Figure 6. Pad mounted switchgear
Figure 6. Pad mounted switchgear
Figure 7. Group-operated three-pole air break switch
Figure 7. Group-operated three-pole air break switch

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Occupational Safety & Health Administration
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Washington, DC 20210		 Page last updated: 11/19/2009