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What are the commonly used text symbols for electrical equipment?
There are many such symbols, and some of them are listed here for reference only:

Serial number component name

New symbol old symbol

1 relay K J

2 current relays KA LJ

3 negative sequence current relay Kan FLJ

4 zero sequence current relay KAZ LLJ

5 kV voltage relay YJ

6 positive sequence voltage relay kvpjyj

7 negative sequence voltage relay kvnffyj

8 zero sequence voltage relay KVZ LYJ

9 time relay KT SJ

10 power relay KP GJ

1 1 differential relay KDCJ

12 signal relay KS XJ

13 signal pulse relay kaixmj

14 relay KC ZJ

15 thermal relay KR RJ

16 impedance relay KI ZKJ

17 temperature relay KTP WJ

18 gas relay KG WSJ

19 turn off relay KCR or KON HJ.

20 travel relay KTR TJ

2 1 turn off relay KCP HWJ

22 travel relay KTP TWJ

23 power monitoring relay KVS JJ

24 pressure monitoring relay KVP YJJ

25 volt voltage relay KVM YZJ

26 accident signal relay kcaxjj

27 relay protection tripping export relay Kou BCJ

28 manually turn off relay KCRM SHJ

29 manual trip relay KTPM STJ

30 Accelerated Relay KAC or KCL JSJ

3 1 reset relay KPE FJ

32 Lock relay KLA or BSJ KCB

33 Check relay KSY·TJJ at the same time.

34 automatic quasi-synchronous device ASA ZZQ

35 automatic reclosing device has ZCJ.

36 automatic excitation regulating device AVR or AAVR ZTL

37 standby power supply automatic input device AATS or RSAD BZT

Button up sb.

39 close button SBC HA

40 trip button SBT TA

4 1 reset button SBre or SBR FA

42 test button SBte YA

43 emergency stop button SBes JTA

44 start button SBst QA

45 self-sustaining button SBhs BA

46 Stop pressing the button SBss

47 control switch SAC KK

48 transfer switch SAH or ZK

49 measuring switch Sam CK

50 synchronous transfer switch SAS TK

5 1 automatic synchronous transfer switch 2 ASC DTK

52 manual synchronous transfer switch 1SASC STK

53 self-synchronous transfer switch SSA2 ZTK

control switch

Selector switch SA

Button switch SB

Liquid level sensor SL

Pressure sensor SP

Position sensor (including proximity sensor) SQ

Speed sensor SR

Temperature sensor ST

54 automatic switch QA

55-knife switch QK or SN DK

Fulu no.56

57 fast fuse boxes

58 lock switch SAL BK

59 signal lamp HL XD

60 optical plate HL or HP assembly

6 1 Call HAB or Haji

62 close contactor kmhc

63 contactor KM C

64 closed coil Yon or LC HQ

65 trip coil Yoff or LT TQ

66 socket XS

67 plug XP

68 terminal strip XT

69 test terminal XE

70 connector XB low voltage