4) AVR -- Automatic Voltage Regulator
5) VFD -- Variable Frequency Drive
6) MCB -- Miniature Circuit Breaker
7) MCCB -- Molded Case Circuit Breaker
8 ) HT -- High Tension
9) LT --Low Tension
10) ATS -- Automatic Transfer Switch
11) DB -- Distribution Board
12) SDB -- Sub Distribution Board
13) VCB -- Vaccum Circuit Breaker
14) ACB --Air Circuit Breaker
15) BBT -- Bus Bar Trunking System
16) MPCB -- Motor Protection Circuit Breaker
17) DOF -- Drop Out Fuse
18) PFI -- Power Factor Improvement
19) HRC Fuse-- High Rupturing Capacity
20) L1, L2, L3 -- Supply Coil in three phase
system
21) R, S, T -- Input terminal of supply coil
22) U, V, W -- Output terminal of Supply Coil
23) LBS --Load Break Switch
24) ELCB -- Earth leakage Circuit Breaker
25) RCCB -- Residual Current Circuit Breaker
26) OCB --Oil Circuit Breaker
27) PLC --Programmable Logic Controller
28) DCS --Distributed Control System
29) SCADA --Supervisory Control & Data
Acquisition system
30) HMI -- Human Machine Interface
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