Loss of electrical feedback detector
Loss of neutral or ground protection circuit
Loss of phase detector for a polyphase power system
Loss-of-potential supervision for a distance relay
Lost gas indicator for gas tube lightning arrestors
Low capacitance surge protector for high speed data...
Low leakage isolating transformer for electromedical apparatus
Low level voltage programmable logic control
Low overvoltage reactance circuit-breaker
Low tension ignition system
Low voltage cutoff circuit for an electrochemical cell
Low voltage protection circuit
Low voltage surge protection network