ANSI Device Numbers
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The ANSI Standard Device Numbers[1] [2] [3] denote what features a protective device supports (such as a relay or circuit breaker). The types of devices protect electrical systems and components from damage when an unwanted event occurs, such as an electrical fault.
[edit] List of Device Numbers
1 - Master Element
2 - Time Delay Starting or Closing Relay
3 - Checking or Interlocking Relay
4 - Master Contactor
5 - Stopping Device
6 - Starting Circuit Breaker
7 - Anode Circuit Breaker余华代表作
8 - Control Power Disconnecting Device
9 - Reversing Device
10 - Unit Sequence Switch
11 - Rerved for future application
12 - Overspeed Device
13 - Synchronous-speed Device
14 - Underspeed Device
15 - Speed - or Frequency, Matching Device
16 - Rerved for future application
17 - Shunting or Discharge Switch
18 - Accelerating or Decelerating Device
19 - Starting to Running Transition Contactor
20 - Electrically Operated Valve
21 - Distance Relay
22 - Equalizer Circuit Breaker
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23 - Temperature Control Device
恋爱夏天24 - Over-Excitation Relay
25 - Synchronizing or Synchronism-Check Device
26 - Apparatus Thermal Device
27 - Undervoltage Relay
28 - Flame Detector
29 - Isolating Contactor
30 - Annunciator Relay
31 - Separate Excitation Device
32 - Directional 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 Conduction Monitor
40 - Field Relay
41 - Field Circuit Breaker
42 - Running Circuit Breaker
43 - Manual Transfer or Selector Device
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44 - Unit Sequence Starting Relay
45 - Atmospheric Condition Monitor
46 - Rever-pha or Pha-Balance Current Relay
47 - Pha-Sequence Voltage Relay
48 - Incomplete Sequence Relay
49 - Machine or Transformer, Thermal Relay
50 - Instantaneous Overcurrent or Rate of Ri, Relay
51 - AC Time Overcurrent Relay
52 - AC Circuit Breaker
53 - Exciter or DC Generator Relay
54 - High-Speed DC Circuit Breaker
55 - Power Factor Relay
56 - Field Application Relay
57 - Short-Circuiting or Grounding (Earthing) Device
58 - Rectification Failure Relay
59 - Overvoltage Relay
60 - Voltage or Current Balance Relay
61 - Machine Split Pha Current Balance
62 - Time-Delay Stopping or Opening Relay
63 - Pressure Switch
64 - Ground (Earth) Detector Relay
65 - Governor
66 - Notching or Jogging Device
67 - AC Directional Overcurrent Relay
68 - Blocking Relay
小故事搞笑69 - Permissive Control Device
70 - Rheostat
71 - Level Switch
72 - DC Circuit Breaker
73 - Load-Resistor Contactor
74 - Alarm Relay
拍皮球教案75 - Position Changing Mechanism
76 - DC Overcurrent Relay
77 - Pul Transmitter
78 - Pha-Angle Measuring or Out-of-Step Protective Relay
79 - AC Reclosing Relay
80 - Flow Switch
81 - Frequency Relay
82 - DC Reclosing Relay
83 - Automatic Selective Control or Transfer Relay
84 - Operating Mechanism
85 - Carrier or Pilot-Wire Receiver Relay
86 - Lockout Relay
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
Depends94 - Tripping or Trip-Free Relay
95 - Reluctance Torque Synchrocheck
96 - Autoloading 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
Note 1: A suffix letter may be ud with the device number; for example, suffix N is ud if the device is connected to a Neutral wire (example: 59N in Siemens Relay is ud for protection against Neutral Displacement); and suffixes X,Y,Z are ud for auxiliary devices. Similarly, the "G" suffix denotes a "ground", hence a "51G" being a time overcurrent ground relay[4].
Note 2: A suffix number may also be ud with a device number: numbers are ud to distinguish multiple "same" devices in the same equipment such as 51-1, 51-2.
Note 3: Device numbers may be combined if the device provides multiple functions, such as the instantaneous/time-delay AC over current relay denoted as 50/51
Note 4: For function descriptions, refer to IEEE standards reference library or American Standards C37. For understanding and learning application of the devices, many technical reference books have been published and are are available. The device numbers and their application are typically in the domain of electrical engineers, specifically power generation, transmission or distribution system engineers in regards to safely controlling and protecting urs and equipment
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