Richard Hughes (deceased)
Pump & Motor Works, Inc.

This series of four articles covers many schemes of motor protection and control.

Topics covered include:

• Time delay fuses
  • Fuse selection
  • Over-current protection
  • Avoiding fuse overloads
• Circuit breakers
  • Inputs to electronic protection relays
  • Feeding, protecting a motor starter
  • Common features
• Motor starters
  • How motor starters operate
  • Light, medium or heavy duty
  • Momentary start button
  • Wye series start, parralel run
  • Variety of controls
• IEEE and ANSI power system device numbers
• Dashpot type overload relay
• Thermal overload relay
• Current transformer
• Compact relays
• Restoring balanced voltage
• Transient voltages
• Surge capacitor, surge arrestor

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