১) MC --- Magnetic Contactor
২) NO --- Normally Open
৩) NC ----- Normally Close
৪) AVR ----- Automatic Voltage Regulator
৫) VFD ------ Variable Frequency Drive
৬) MCB ----- Miniature Circuit Breaker
৭) MCCB ------ Molded Case Circuit Breaker
৮) HT ---- High Tension
৯) LT ----- Low Tension
১০) ATS ----- Automatic Transfer Switch
১১) DB ----- Distribution Board
১২) SDB ------- Sub Distribution Board
১৩) VCB ----- Vaccum Circuit Breaker
১৪) ACB ----- Air Circuit Breaker
১৫) BBT ---- Bus Bar Trunking System
১৬) MPCB ------ Motor Protection Circuit Breaker
১৭) DOF ----- Drop Out Fuse
১৮) PFI ----- Power Factor Improvement
১৯) HRC Fuse ---- High Rupturing Capacity
২০) L1, L2, L3 ------ Supply Coil in three phase system
২১) R, S, T ------ Input terminal of supply coil
২২) U, V, W ----- Output terminal of Supply Coil
২৩) LBS ---- Load Break Switch
২৪) ELCB ----- Earth leakage Circuit Breaker
২৫) RCCB ----- Residual Current Circuit Breaker
২৬) OCB ---- Oil Circuit Breaker
২৭) PLC ---- Programmable Logic Controller
২৮) DCS ---- Distributed Control System
২৯) SCADA ---- Supervisory Control & Data Acquisition system
৩০) HMI ----- Human Machine Interface
৩১) OLR ------ Overload Relay
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