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List of Device Numbers
! B8 P; T3 ^2 A" y! @) W* F, kClick to learn more..., ?6 G7 t: \9 e$ v1 g# U) {. s
5 U2 L$ d( Q$ ]/ x( m/ V * 1 - Master Element
& z. D9 b" n4 K * 2 - Time Delay Starting or Closing Relay4 H! A# a' \. G% l# v! l3 d
* 3 - Checking or Interlocking Relay; p8 q! M7 X5 e# G: r ^ V5 N: O
* 4 - Master Contactor# B+ f" L, }$ a. k0 b& n: ~9 X
* 5 - Stopping Device) Y4 A! I7 `$ X+ W: {' ~+ I) j
* 6 - Starting Circuit Breaker
& a: y! G5 K4 Q * 7 - Anode Circuit Breaker' z/ I8 n4 h: I& X! X& ^
* 8 - Control Power Disconnecting Device
: h3 _& C" j- X8 h: O0 }. } * 9 - Reversing Device0 w6 G2 M8 t' n
* 10 - Unit Sequence Switch, {, l& y6 I+ z$ j3 _' ]2 N0 A
* 12 - Overspeed Device
" }0 W7 K0 Q0 H. i3 Q * 13 - Synchronous-speed Device
* S4 f/ o- w' j4 B# T$ e% Z3 m * 14 - Underspeed Device# f r. r4 x& J# I: H
* 15 - Speed - or Frequency-Matching Device; l, w8 K' Q' q
* 21 - Distance Relay
6 P# A. S9 ?2 ?( M * 23 - Temperature Control Device
5 ~5 F- a- {0 |# u, y& m9 q, J6 w * 25 - Synchronizing or Synchronism-Check Device$ e7 I: s8 B; p9 r
* 26 - Apparatus Thermal Device8 D7 t0 H$ S1 a `4 H( ~! ~
* 27 - Undervoltage Relay6 k$ q: w4 k2 q
* 29 - Isolating Contactor
J r+ N. T3 Y/ Z * 30 - Annunciator Relay+ t! ]4 F- @2 `; n$ Z2 j2 {
* 32 - Directional Power Relay3 ? S/ J9 Y5 g2 a7 U
* 36 - Polarity or Polarizing Voltage Devices
4 C. y' A$ ?: K/ @* l" C4 D4 z * 37 - Undercurrent or Underpower Relay% N; c, b% {) n# t# _% g
* 38 - Bearing Protective Device
+ ]) U# X8 E9 ^: E, d * 39 - Mechanical Conduction Monitor4 |6 J2 \0 {7 q# t
* 40 - Field Relay3 C. u7 }9 }4 ~: V. s
* 41 - Field Circuit Breaker
$ {0 x# {6 p) m$ W$ l * 42 - Running Circuit Breaker
. D% t- g7 _* P7 W * 43 - Manual Transfer or Selector Device
7 g- C) V6 e) D- @ |% e" s * 46 - Reverse-phase or Phase-Balance Relay
+ V% a6 Q' }9 r, C- n: V" i3 F * 47 - Phase-Sequence Voltage Relay2 P9 N; B7 Y" G+ M0 l
* 48 - Incomplete-Sequence Relay" u1 C% Z( `$ k1 E7 `, o) F
* 49 - Machine or Transformer Thermal Relay
$ U# u' u% F: K% m+ N3 y1 x * 50 - Instantaneous Overcurrent
# d+ M, c$ C9 V6 Q * 51 - AC Time Overcurrent Relay% U' Y% Q7 @- A. G' F+ N" x @
* 52 - AC Circuit Breaker; c8 [; q k1 ^. u' ]% [% @' F
* 53 - Exciter or DC Generator Relay$ o6 k! r3 u, G: o& V% P
* 54 - High-Speed DC Circuit Breaker( Z+ ` h' o4 l9 r5 R
* 55 - Power Factor Relay; h! \! I3 ~9 x: s0 ~% i
* 56 - Field Application Relay" D" [% D& H4 k L9 q" I* E; U
* 59 - Overvoltage Relay
+ V5 m- n k' k; f * 60 - Voltage or Current Balance Relay. ^" @7 b8 ]! M" w( I5 v
* 61 - Machine Split Phase Current Balance
3 I- |. y9 {8 D; A3 K * 62 - Time-Delay Stopping or Opening Relay
. ]- ^# R+ v7 x, c) V4 I * 63 - Pressure Switch2 [+ y/ K# g3 |
* 64 - Ground Detector Relay
$ C& i+ l: {4 W * 65 - Governor
) n6 F. w* E, U; m * 66 - Starts per Hour: Y$ _# A# F9 i! b" N! i, U
* 67 - AC Directional Overcurrent Relay
' a: z& L6 Z5 h * 68 - Blocking Relay
0 j) b5 O) S4 m; E3 d0 m. q * 69 - Permissive Control Device2 M( g4 T$ p0 I# @
* 71 - Level Switch
9 y9 K! d, \3 d" q. a0 G * 72 - DC Circuit Breaker
; Q% v4 L- y8 n * 74 - Alarm Relay7 V/ ~; |9 L" Q% l% }5 K; I1 `
* 75 - Position Changing Mechanism
/ e+ A0 s$ S' @. b * 76 - DC Overcurrent Relay f! @8 j! }) d
* 78 - Phase-Angle Measuring or Out-of-Step Protective Relay3 R* z3 y+ Y% u
* 79 - AC-Reclosing Relay
9 o1 j" S- z; L( m, \! G- x * 81 - Frequency Relay
0 ~0 I* ]* u5 ?. m * 83 - Automatic Selective Control or Transfer Relay" h! H7 x+ m- z5 u( | ^1 v' ^. t" w9 `
* 84 - Operating Mechanism7 T* `6 d8 ~- V5 \
* 85 - Carrier or Pilot-Wire Receiver Relay
2 @) h" \9 p& a6 B. \ * 86 - Lockout Relay
' ?: k5 J/ P3 D5 l9 f9 A5 _ * 87 - Differential Protective Relay' ]$ a8 \5 a7 H4 R: }) ^; G
* 89 - Line Switch9 ^# q* E- R) ] P
* 90 - Regulating Device
2 R3 @; ~% n6 }1 l * 91 - Voltage Directional Relay
2 M5 X; I/ D# i4 L; ~& r * 92 - Voltage and Power Directional Relay' f3 L9 `1 s; I8 l& }* h
* 94 - Tripping or Trip-Free Relay- h/ ^# `6 P: e4 |$ j9 p* N# R
* 95 - Reluctance Torque Synchrocheck0 e/ C* K: R7 _# U% c5 m9 j) f
* 96 - Autoloading Relay |
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