General Overview Flashcards
1
Master element
2
Time-delay starting or closing relay
3
Checking or interlocking relay, complete sequence
4
Master protective
5
Stopping device, emergency stop switch
6
Starting circuit breaker
7
Rate of change relay
8
Control power disconnecting device
9
Reversing device
10
Unit sequence switch
11
Multifunction device
12
Overspeed Device
13
Synchronous-speed device
14
Underspeed device
15
Speed or frequency matching device
16
Data communication device
17
Shunting or discharge switch
18
Accelerating or decelerating device
19
Starting to running transition contactor
20
Electrically operated valve (solenoid valve)
21
Distance relay
22
Equalizer circuit breaker
23
Temperature control device, heater
24
Volts per hertz relay
25
Synchronizing or synchronism-check device
26
Apparatus thermal device, temperature switch
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 device
37
Undercurrent or underpower relay
38
Bearing protective device / bearing RTD
39
Mechanical condition monitor (vibration)
40
Field relay / loss of excitation
41
Field circuit breaker
42
Running circuit breaker
43
Manual transfer or selector device
44
Unit sequence or starter relay
45
Fire detector
46
Reverse-phase or phase balance current relay or stator current unbalance
47
Phase-sequence or phase balance voltage relay
48
Incomplete sequence relay / blocked rotor
49
Machine or transformer thermal relay / thermal overload
50
Instantaneous overcurrent relay
51
AC time overcurrent relay
52
AC circuit breaker
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 detector
64
Ground protective relay
65
Govenor
66
Notching or jogging device / maximum starting rate / starts per hour / time between starts
67
AC directional overcurrent relay
68
Blocking relay / power swing blocking
69
Permissive control device
70
Rheostat
71
Liquid switch
72
DC circuit breaker
73
Load-resistor contactor
74
Alarm relay
75
Position changing mechanism
76
DC overcurrent relay
77
Telemetering device, speed sensor
78
Phase angle measuring or out-of-step protective relay
79
AC reclosing relay / auto reclose
80
Liquid or gas flow relay
81
Frequency relay
82
DC reclosing relay
83
Automatic selective control or transfer relay
84
Operative mechanism
85
Pilot communications, carrier or pilot-wire relay
86
Lock-out relay, master trip 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
94
Tripping or trip-free relay
96
Transmitter
95, 97-99
For specific applications where other numbers are not suitable
