ANSI Protection Codes

Electrical
1

ANSI (American National Standards Institute) protection codes are a system of categories that specify the amount of protection given by safety equipment and devices, particularly personal protective equipment (PPE).

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These codes ensure that the equipment fulfils particular safety standards, which protect against hazards such as impact, chemical exposure, & electrical threats. The codes are widely utilised in many industries to ensure worker safety & compliance with regulatory standards.

  • 1 – Master Element

  • 2 – Time delay Starting or Closing Relay

  • 3 – Checking or Interlocking Relay

  • 4 – Master Contactor

  • 5 – Stopping

  • 6 – Starting Circuit Breaker

  • 7 – Rate of Change Relay

  • 8 – Control Power Disconnecting Device

  • 9 – Reversing Device

  • 10 – Unit Sequence Switch

  • 11 – Multi-function Device

  • 12 – Overspeed Device

  • 13 – Synchronous-speed Device

  • 14 – Underspeed Device

  • 15 – Speed – or Frequency, Matching Device

  • 16 – Data Communications Device

  • 17 – Shunting or Discharge Switch

  • 18 – Accelerating or Decelerating Device

  • 19 – Starting to Running Transition Contractor

  • 20 – Electrically Operated Valve

  • 21 – Distance Relay

  • 22 – Equalizer Circuit Breaker

  • 23 – Temperature Control Device

  • 24 – Volts Per Hertz Relay

  • 25 – Synchronizing or Synchronize-Check Device

  • 26 – Apparatus Thermal Device

  • 27 – Undervoltage Relay

  • 27s- DC under voltage Relay

  • 28 – Flame detector

  • 29 – Isolating Contactor or Switch

  • 30 – Annunciator Relay

  • 31 – Separate Excitation

  • 32 – Directional Power Relay or Reverse Power Relay

  • 33 – Position Switch

  • 34 – Master Sequence Device

  • 35 – Brush-Operating or Slip-Ring Short-Circuiting Device

  • 36 – Polarity or Polarizing Voltage Devices

  • 37 – Undercurrent or Underpower Relay

  • 38 – Bearing Protective Device

  • 39 – Mechanical Condition Monitor

  • 40 – Field (over/under excitation) Relay

  • 41 – Field Circuit Breaker

  • 42 – Running Circuit Breaker

  • 43 – Manual Transfer or Selector Device

  • 44 – Unit Sequence Starting Relay

  • 45 –DC over voltage Relay

  • 46 – Reverse-phase or Phase-Balance Current Relay

  • 47 – Phase-Sequence or Phase-Balance Voltage Relay

  • 48 – Incomplete Sequence Relay

  • 49 – Machine or Transformer, Thermal Relay-OLR

  • 50 – Instantaneous Overcurrent Relay

  • 50G - Instantaneous Earth Over Current Relay (Neutral CT Method)

  • 50N - Instantaneous Earth Over Current Relay (Residual Method)

  • 50BF - Breaker failure

  • 51 – AC Inverse Time Overcurrent Relay

  • 51G- AC Inverse Time Earth Overcurrent Relay (Neutral CT Method)

  • 51N- AC Inverse Time Earth Overcurrent Relay (Residual Method)

  • 52 – AC Circuit Breaker

  • 52a- AC Circuit Breaker (CB) Position (Contact Open when Breaker Open)

  • 52b- AC Circuit Breaker (CB) Position (Contact Closed when Breaker Open)

  • 53 – Exciter or DC Generator Relay

  • 54 – Turning Gear Engaging Device

  • 55 – Power Factor Relay

  • 56 – Field Application Relay

  • 57 – Short-Circuiting or Grounding Device

  • 58 – Rectification Failure Relay

  • 59 – Overvoltage Relay

  • 60 – Voltage or Current Balance Relay

  • 61 – Density Switch or Sensor

  • 62 – Time-Delay Stopping or Opening Relay

  • 63 – Pressure Switch

  • 64 – Ground Detector Relay

  • 64R - Restricted earth fault

  • 64S - Stator earth fault

  • 65 – Governor

  • 66 – Notching or Jogging Device

  • 67 – AC Directional Overcurrent Relay

  • 68 – Blocking Relay

  • 69 – Permissive Control Device

  • 70 – Rheostat

  • 71 – Liquid Level Switch

  • 72 – DC Circuit Breaker

  • 73 – Load-Resistor Contactor

  • 74 – Alarm Relay

  • 75 – Position Changing Mechanism

  • 76 – DC Overcurrent Relay

  • 77 – Telemetering Device

  • 78 – Phase-Angle Measuring Relay or “Out-of-Step” Relay

  • 79 – AC Reclosing Relay (Auto Reclosing)

  • 80 – Flow Switch

  • 81 – Frequency Relay

  • 82 – DC Reclosing Relay

  • 83 – Automatic Selective Control or Transfer Relay

  • 84 – Operating Mechanism

  • 85 – Communications, Carrier or Pilot-Wire Relay

  • 86 – Lockout Relay/Master Trip

  • 87 – Differential Protective Relay

  • 88 – Auxiliary Motor or Motor Generator

  • 89 – Line Switch

  • 90 – Regulating Device

  • 91 – Voltage Directional Relay

  • 92 – Voltage and Power Directional Relay

  • 93 – Field Changing Contactor

  • 94 – Tripping (or) Trip-Free Relay( Trip Circuit Supervision Relay)

  • 95 – For specific applications as other numbers are not suitable

  • 96 – Busbar Trip Lockout relay

  • 97 – For specific applications where other numbers are not suitable

  • 98 – For specific applications where other numbers are not suitable

  • 99 – For specific applications where other numbers are not suitable

  • 150 – Earth Fault Indicator

  • AFD – Arc Flash Detector

  • CLK – Clock or Timing Source

  • DDR – Dynamic Disturbance Recorder

  • DFR – Digital Fault Recorder

  • DME – Disturbance Monitor Equipment

  • ENV – Environmental Data

  • HIZ – High Impedance