Latest IEEE device numbers /ANSI Codes explained

byM.Senthil •
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The full form of the ANSI code is the American National Standards Institute code.

They don't really create the standards, but they provide the process by which they should be created.

 ANSI codes are also called Electrical ANSI Device numbers.

What is ANSI code in Electrical? 

The American National Standards Institute is a stakeholder organization that ensures the integrity of the standardization system in the USA (United State of America). ANSI was founded in 1918. 

They have a long history and strong reputation for working in close collaboration with all stakeholders to solve industry problems on behalf of the united states and around the world.

The ANSI Federation includes over 30 million professionals worldwide, industry-government trade associations, academia individual standard developers, professional societies, service organizations, consumer and labor interest, and many more.

ANSI code for electrical protective devices

Each electrical safety device is represented by a fixed number. These standard device numbers are used in a single-line diagram. One can confirm the type of safety device used in the substation by identifying the device number as shown on the single line diagram.

ANSI device numbers

  • The standard ANSI code for Master Element is 1
  • The standard ANSI code for Time-delay Starting or Closing Relay is 2
  • The standard ANSI code for Checking or Interlocking Relay, complete Sequence is 3
  • The standard ANSI code for Master Protective devices is 4
  • The standard ANSI code for Stopping Device, Emergency Stop Switch is 5
  • The standard ANSI code for Starting Circuit Breaker is 6
  • The standard ANSI code for Rate of Change Relay is 7
  • The standard ANSI code for Control Power Disconnecting Device is 8
  • The standard ANSI code for  Reversing Device is 9
  • The standard ANSI code for  Unit Sequence Switch is 10
  • The standard ANSI code for  Multifunction Device is 11
  • The standard ANSI code for  Overspeed Device is 12
  • The standard ANSI code for  Synchronous-Speed Device is 13
  • The standard ANSI code for  Underspeed Device is 14
  • The standard ANSI code for  Speed or Frequency Matching Device is 15
  • The standard ANSI code for Data Communications Device is 16
  • The standard ANSI code for Shunting or Discharge Switch is 17
  • The standard ANSI code for Accelerating or Decelerating Device is 18
  • The standard ANSI code for Starting-to-Running Transition Contactor is 19
  • The standard ANSI code for Electrically-Operated Valve ( Solenoid Valve ) is 20
  • The standard ANSI code for Distance Relay is 21
  • The standard ANSI code for Ground Distance relay is 21 G
  • The standard ANSI code for Phase Distance relay is 21 p
  • The standard ANSI code for Equalizer circuit breaker is 22
  • The standard ANSI code for the Temperature control device, Heater is 23
  • The standard ANSI code for Volts per hertz relay is 24
  • The standard ANSI code for Synchronizing or synchronism-check device is 25
  • The standard ANSI code for Apparatus thermal device, Temperature Switch is 26
  • The standard ANSI code for Undervoltage relay is 27
  • The standard ANSI code for Phase Undervoltage is 27P
  • The standard ANSI code for DC Undervoltage relay is 27S
  • The standard ANSI code for Third Harmonic Neutral Undervoltage is 27TN
  • The standard ANSI code for 100% Stator Earth Fault is 27 TN
  • The standard ANSI code for Auxiliary Undervoltage is 27X
  • The standard ANSI code for Undervoltage Auxiliary Input is 27 AUX
  • The standard ANSI code for Bus/Line Undervoltage is 27/27X
  • The standard ANSI code for Accidental Generator Energization is 27/50
  • The standard ANSI code for Flame Detector is 28
  • The standard ANSI code for Isolating Contactor is 29
  • The standard ANSI code for Annunciator Relay is 30
  • The standard ANSI code for Separate Excitation Device is 31 
  • The standard ANSI code for Directional Power Relay is 32 
  • The standard ANSI code for Low Forward Power is 32L
  • The standard ANSI code for High Directional Power is 32 H
  • The standard ANSI code for Wattmetric Zero-Sequence Directional is 32 N
  • The standard ANSI code for Directional Power is 32 P
  • The standard ANSI code for Reverse Power is 32R
  • The standard ANSI code for Position Switch is 33
  • The standard ANSI code for Master Sequence Device is 34
  • The standard ANSI code for Brush-Operating or Slip-ring Short-Circuiting Device is 35
  • The standard ANSI code for Polarity or Polarizing Voltage Device is 36
  • The standard ANSI code for Undercurrent or Underpower Relay is 37
  • The standard ANSI code for Underpower is 37 P
  • The standard ANSI code for Bearing Protective Device / Bearing Rtd is 38
  • The standard ANSI code for Mechanical Condition Monitor ( Vibration ) is 39
  • The standard ANSI code for  Field Relay / Loss of Excitation is 40
  • The standard ANSI code for  Field Circuit Breaker is 41
  • The standard ANSI code for  Running Circuit Breaker is 42
  • The standard ANSI code for  Manual Transfer or Selector Device is 43
  • The standard ANSI code for Unit Sequence Starting Relay is 44
  • The standard ANSI code for  Fire Detector is 45
  • The standard ANSI code for Reverse-Phase or Phase Balance Current Relay or Stator Current Unbalance is 46
  • The standard ANSI code for Phase-Sequence or Phase Balance Voltage Relay is 47
  • The standard ANSI code for Incomplete Sequence Relay / Blocked Rotor is 48
  • The standard ANSI code for Machine or Transformer Thermal Relay / Thermal Overload is 49
  • The standard ANSI code for RTD Biased Thermal Overload is 49 RTD
  • The standard ANSI code for Instantaneous Overcurrent Relay is 50
  • The standard ANSI code for Breaker Failure is 50 BF
  • The standard ANSI code for Current Disturbance Detector is 50 DD
  • The standard ANSI code for End Fault Protection is 50 EF
  • The standard ANSI code for Ground Instantaneous Overcurrent is 50G
  • The standard ANSI code for Isolated Ground Instantaneous Overcurrent is 50 IG
  • The standard ANSI code for Acceleration Time is 50 LR
  • The standard ANSI code for Neutral Instantaneous Overcurrent is 50 N
  • The standard ANSI code for Neutral Instantaneous Breaker Failure is 50 NBF
  • The standard ANSI code for Phase Instantaneous Overcurrent is 50 P
  • The standard ANSI code for Sensitive Ground Instantaneous Overcurrent is 50 SG
  • The standard ANSI code for Split Phase Instantaneous Current is 50 SP
  • The standard ANSI code for Negative Sequence Instantaneous Overcurrent is 50Q
  • The standard ANSI code for  Accidental Energization is 50/27
  • The standard ANSI code for Instantaneous / Time-delay Overcurrent relay is 50/51
  • The standard ANSI code for Sensitive earth-fault protection is 50Ns/51NS
  • The standard ANSI code for Ct Trouble is 50/74
  • The standard ANSI code for Instantaneous Differential is 50/87
  • The standard ANSI code for AC Time Overcurrent Relay is 51
  • The standard ANSI code for Ground Time Overcurrent is 51 G
  • The standard ANSI code for AC inverse time overcurrent (locked rotor) protection relay is 51LR
  • The standard ANSI code for  Neutral Time Overcurrent is 51 N
  • The standard ANSI code for Phase Time Overcurrent is 51 P
  • The standard ANSI code for Locked / Stalled Rotor is 51R
  • The standard ANSI code for Voltage Restrained Time Overcurrent is 51 V
  • The standard ANSI code for Negative Sequence Time Overcurrent is 51 Q
  • The standard ANSI code for AC circuit breaker is 52
  • The standard ANSI code for AC circuit breaker position (contact open when circuit breaker open) is 52 a
  • The standard ANSI code for AC circuit breaker position (contact closed when circuit breaker open) is 52 b
  • The standard ANSI code for Exciter or Dc Generator Relay is 53
  • The standard ANSI code for Turning Gear Engaging Device is 54
  • The standard ANSI code for Power Factor Relay is 55
  • The standard ANSI code for Field Application Relay is 56
  • The standard ANSI code for Short-Circuiting or Grounding Device is 57
  • The standard ANSI code for Rectification Failure Relay is 58
  • The standard ANSI code for Overvoltage Relay is 59
  • The standard ANSI code for Bank Phase Overvoltage is 59 B
  • The standard ANSI code for Phase Overvoltage is 59 P
  • The standard ANSI code for Neutral Overvoltage is 59 N
  • The standard ANSI code for Neutral Voltage Unbalance is 59 NU
  • The standard ANSI code for Phase Overvoltage is 59 P
  • The standard ANSI code for Auxiliary Overvoltage is 59 X
  • The standard ANSI code for Negative Sequence Overvoltage is 59 Q
  • The standard ANSI code for Voltage or Current Balance Relay is 60
  • The standard ANSI code for Neutral Current Unbalance is 60 N
  • The standard ANSI code for Phase Current Unbalance is 60 P
  • The standard ANSI code for Density Switch or Sensor is 61
  • The standard ANSI code for Time-Delay Stopping or Opening Relay is 62
  • The standard ANSI code for Pressure Switch Detector is 63
  • The standard ANSI code for Ground Protective Relay is 64
  • The standard ANSI code for Field Ground Protection is 64 F
  • The standard ANSI code for Rotor earth fault is 64 R
  • The standard ANSI code for Restricted earth fault differential is 64REF
  • The standard ANSI code for Stator earth fault is 64S 
  • The standard ANSI code for Sub-harmonic Stator Ground Protection is 64S 
  • The standard ANSI code for 100% Stator Ground is 64TN
  • The standard ANSI code for Governor is 65 
  • The standard ANSI code for Notching or Jogging Device/Maximum Starting Rate/Starts Per Hour/Time Between Starts is 66
  • The standard ANSI code for AC Directional Overcurrent Relay is 67 
  • The standard ANSI code for Ground Directional Overcurrent is 67G 
  • The standard ANSI code for Neutral Directional Overcurrent is 67N
  • The standard ANSI code for Earth fault directional is 67Ns
  • The standard ANSI code for Phase Directional Overcurrent is 67P 
  • The standard ANSI code for Sensitive Ground Directional Overcurrent is 67SG
  • The standard ANSI code for  Negative Sequence Directional Overcurrent is 67Q
  • The standard ANSI code for Blocking Relay / Power Swing Blocking is 68
  • The standard ANSI code for Permissive Control Device is 69 
  • The standard ANSI code for Rheostat is 70
  • The standard ANSI code for Liquid Switch or Level Switch is 71  
  • The standard ANSI code for  DC Circuit Breaker is 72
  • The standard ANSI code for  Load-Resistor Contactor is 73 
  • The standard ANSI code for Alarm Relay is 74
  • The standard ANSI code for  Position Changing Mechanism is 75
  • The standard ANSI code for DC Overcurrent Relay is 76
  • The standard ANSI code for Telemetering Device, Speed Sensor is 77
  • The standard ANSI code for Phase Angle Measuring or Out-of-Step Protective Relay is 78 
  • The standard ANSI code for Loss of Mains is 78V
  • The standard ANSI code for AC Reclosing Relay / Auto Reclose is 79 
  • The standard ANSI code for Liquid or Gas Flow Relay is 80 
  • The standard ANSI code for frequency Relay is 81
  • The standard ANSI code for Over Frequency is 81O
  • The standard ANSI code for Rate-of-Change Frequency is 81R
  • The standard ANSI code for Under Frequency is 81U
  • The standard ANSI code for DC Reclosing Relay is  82
  • The standard ANSI code for Automatic Selective Control or Transfer Relay is 83
  • The standard ANSI code for Operating Mechanism is 84
  • The standard ANSI code for Pilot Communications, Carrier or Pilot-Wire Relay is 85
  • The standard ANSI code for Lock-Out Relay, Master Trip Relay is 86
  • The standard ANSI code for Differential Protective Relay is 87 
  • The standard ANSI code for Bus Differential is 87B
  • The standard ANSI code for Generator Differential is 87G
  • The standard ANSI code for Generator/Transformer Differential is 87 GT
  • The standard ANSI code for Segregated Line Current Differential is 87 L
  • The standard ANSI code for Ground Line Current Differential is 87 LG
  • The standard ANSI code for Motor Differential is 87M
  • The standard ANSI code for Overall Differential is 87 O
  • The standard ANSI code for a Phase Comparison device is 87 PC
  • The standard ANSI code for Restricted Ground Fault is 87 RGF
  • The standard ANSI code for Stator Differential is 87S
  • The standard ANSI code for Percent Differential is 87S
  • The standard ANSI code for Transformer Differential is 87T
  • The standard ANSI code for Voltage Differential is 87 V
  • The standard ANSI code for Auxiliary Motor or Motor Generator is 88
  • The standard ANSI code for Line Switch is 89
  • The standard ANSI code for Regulating Device is 90
  • The standard ANSI code for Voltage Directional Relay is 91
  • The standard ANSI code for Voltage And Power Directional Relay is 92
  • The standard ANSI code for Field-Changing Contactor is 93
  • The standard ANSI code for Tripping or Trip-Free Relay is 94
  • The standard ANSI code for Transmitter is 96









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