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