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earth leakage circuit breaker : ウィキペディア英語版 | earth leakage circuit breaker
thumb 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.
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