No. Description -- -----------11 Multifunction device - contains other numbers as appropriate (new in 1996 edition).
21 Distance relay
25 Synchronizing or synch-check relay
27 Undervoltage relay
32 Directional power relay
37 Undercurrent or underpower relay
43 Manual selector
46 Reverse-phase, phase-balance, or negative-sequence current relay
47 Phase-sequence voltage relay
49 Thermal relay
50 Instantaneous overcurrent relay
51 Time-overcurrent relay
52 Power circuit breaker
55 Power factor relay
59 Overvoltage relay
62 Time delay stopping relay
67 Directional overcurrent relay
68 Blocking relay
78 Phase angle or out-of-step relay
79 Reclosing relay
81 Frequency relay
85 Carrier or pilot relay
86 Lockout relay
87 Current differential relay
89 Power disconnect switch
94 Auxiliary tripping relay
101 Breaker control switch
Add suffix letters and numbers - e.g.: 67N is neutral (ground) directional overcurrent relay 21P-1 is zone 1 phase distance relay.
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