hexafluoride (SF6) high-voltage []Sulfur circuit-breakers Main article: A sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur hexafluoride gas to quench the arc. They are most often used for transmission-level voltages and may be incorporated into compact switchgear. In cold climates, supplemental heating or de-rating of the circuit breakers may be required due to liquefaction of the SF6 gas. breakers []Other The following types are described in separate articles. Breakers for protections against earth faults too small to trip an over-current device: (RCD, formerly known as a residual current circuit breaker) detects current imbalance, but does — not provide over-current protection. (RCBO) combines the functions of an RCD and — an MCB in one package. In the and Canada, panel-mounted devices that combine ground (earth) fault detection and over-current protection are called Ground Fault Circuit Interrupter (GFCI) breakers; a wall mounted outlet device providing ground fault detection only is called a GFI. (ELCB) This detects earth current directly — rather than detecting imbalance. They are no
[]Sulfur hexafluoride (SF6) high-voltage circuit-breakers Main article: A sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur hexafluoride gas to quench the arc. They are most often used for transmission-level voltages and may be incorporated into compact switchgear. In cold climates, supplemental heating or de-rating of the circuit breakers may be required due to liquefaction of the SF6 gas. []Other breakers The following types are described in separate articles. Breakers for protections against earth faults too small to trip an over-current device: (RCD, formerly known as a residual current circuit breaker) — detects current imbalance, but does not provide over-current protection. (RCBO) — combines the functions of an RCD and an MCB in one package. In the and Canada, panel-mounted devices that combine ground (earth) fault detection and over-current protection are called Ground Fault Circuit Interrupter (GFCI) breakers; a wall mounted outlet device providing ground fault detection only is called a GFI. (ELCB) — This detects earth current directly rather than detecting imbalance. They are no
57431585-Circuit-Breaker.docx