ANSI CODE FOR ELECTRICAL EQUIPMENT

ANSI numbers for electrical circuit:

2	Time delay switching (or) closing
3	Checking (or) interlocking
7	Rate of change
21	Distance relay
24	Volt per hertz relay
27	Under voltage
30	Annunciation relay
32	Directional power relay
37	Under current (or) under power relay
40	Field over/under excitation relay
44	Unit sequence starting relay
46	Reverse phase (or) phase balance current relay
47	Phase sequence or phase balance voltage relay
48	Incomplete sequence relay
49	Mechanical or trans thermal relay
50	Instantaneous over current relay
51	Ac  inverse time over current relay
53	Exciter or dc gen relay
55	Power factor relay
56	Field  app relay
58	Rectification failure relay
59	Over voltage relay
60	Voltage or current unbalance relay
62	Time delay stopping or opening relay
64	Ground detector relay
67	AC direction over current relay
68	Blocking or out of step relay
74	Alarm relay
76	DC over current relay
78	Phase angle measuring relay
79	AC reclosing relay
81	Frequency relay
82	DC reclosing relay
83	Automatic selective control or transfer relay
85	Communication or pilot wire relay
86	Lockout relay (Master trip relay)
87	Differential protection relay
87L	Line differential relay
87T	Transformer differential relay
87G	Generator differential relay
91	Voltage direction relay
92	Volt & power direction relay
94	Tripping & trip frequency relay
1	Master element
2	Time delay starting or closing relay
3	Checking or interlocking relay
4	Master contactor
5	Stopping contactor
6	Starting circuit breaker
7	Rate of change relay
8	Control power distribution device
9	Reversing device
10	Unit sequence switch
11	Multifunction device
12	Over speed device
13	Sync-speed device
14	Under speed device
15	Speed or frequency matching device
16	Data communication device
17	Shunting or discharge switch
18	Accelerating or de-accelerating device
19	Starting to running
20	Electrically operated valve
29	Isolating contactor or switch
22	Equalizer circuit breaker
23	Temperature control device
25	Synchronizing check device
26	Apparatus thermal device
28	Flame detector
31	Separate excitation device
33	Position switch
34	Master sequence device
35	Brush operating or slip ring –sc device
36	Polarity or polarizing voltage device
38	Bearing protective device
39	Mechanical condition monitor
41	Field circuit breaker
42	Running circuit breaker
43	Manual transfer or selector device
45	Abnormal atmospheric condition monitor
52	AC circuit breaker
54	Turning gear engaging device
57	Short circuit or grounding device
61	Density switch or sensor
63	Pressure switch
65	Governor
66	Notching or jogging device
69	Permissive control device
70	Rheostat
71	Liquid level switch
72	DC circuit breaker
73	Load resistor contactor
75	Position changing mechanism
77	Telemetering device
80	Flow switch
84	Operating mechanism
89	Line switch
93	Field changing contactor
90	Regulating device
88	Auxiliary motor or motor generator