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Earth leakage circuit breaker
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Earth leakage circuit breaker : ウィキペディア英語版
Earth leakage circuit breaker

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An earth leakage circuit breaker (ELCB) is a safety device used in electrical installations with high earth impedance to prevent shock. It detects small stray voltages on the metal enclosures of electrical equipment, and interrupts the circuit if a dangerous voltage is detected. Once widely used, more recent installations instead use residual current circuit breakers which instead detect leakage current directly.
==Purpose==
The main purpose of earth leakage protectors is to prevent injury to humans and animals due to electric shock.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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