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Numbering System & Symbols Library - 3 Phase

Owen Davis

Created on October 17, 2025

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Power Distribution Block (PDB) – 3-Pole

  • Provides a central point to split incoming three-phase power into multiple branch circuits.
  • Reduces messy wiring by consolidating multiple connections into one block.
  • Common in panels where one feed supplies several motors or drives.
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Circuit Breaker (CB) 3-Pole

  • Protects wiring and equipment from short circuits and overloads.
  • Interrupts all three phases simultaneously if a fault occurs.
  • Often used as the main protective device before motor feeders or drives.
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Motor Circuit Protector (F)

  • Specialized 3-pole breaker designed for motor protection.
  • Provides short-circuit protection but usually paired with an overload relay for full coverage.
  • Faster clearing of faults compared to standard breakers, reducing motor/equipment damage.
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Motor Contactor (CON) 3-Pole

  • Electrically controlled switch for starting/stopping three-phase motors.
  • Opens/closes all three motor power lines at once.
  • Often paired with overload protection to form a “starter.”
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Variable Frequency Drive (ESM)

  • Electronic device that controls motor speed/torque by varying voltage and frequency of power.
  • Provides soft starting/stopping, speed control, and energy savings.
  • Common in conveyors, pumps, fans, and anywhere variable speed is needed.
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Choke (CH)

  • An inductor placed in series with the power line to filter electrical noise and reduce harmonics.
  • Protects VFDs and sensitive equipment from line disturbances.
  • Also smooths current flow to motors, extending motor and drive life.
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Overload (OL)

  • Protects motors from sustained overcurrent (overload) that would cause overheating.
  • Unlike a fuse/breaker, it responds to heat (thermal) or current over time, not instant shorts.
  • Trips the motor contactor open if the motor draws too much current for too long.
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Disconnect Switch (ES) – 3-Pole

  • Provides a physical, lockable means to isolate all three phases of power.
  • Used for maintenance safety (Lockout/Tagout).
  • Often mounted on panel doors or near machines.
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Motor (MTR)

  • The load device that converts electrical energy into mechanical energy (rotation).
  • Three-phase motors are the workhorses of industry — driving pumps, fans, conveyors, compressors, etc.
  • Motors appear throughout schematics as the ultimate “end device” for three-phase circuits.
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