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斷路器工作原理示意圖及圖形符號(hào)
熱脫扣器用于線路的過(guò)負(fù)荷保護(hù)，工作原理和熱繼電器相同。
失壓（欠電壓）脫扣器用于失壓保護(hù)，如圖1-8所示，失壓脫扣器的線圈直接接在電源上，處于吸合狀態(tài)，斷路器可以正常合閘；當(dāng)停電或電壓很低時(shí)，失壓脫扣器的吸力小于彈簧的反力，彈簧使動(dòng)鐵心向上使掛鉤脫扣，實(shí)現(xiàn)短路器的跳閘功能。
分勵(lì)脫扣器用于遠(yuǎn)方跳閘，當(dāng)在遠(yuǎn)方按下按鈕時(shí)，分勵(lì)脫扣器得電產(chǎn)生電磁力，使其脫扣跳閘。
不同斷路器的保護(hù)是不同的，使用時(shí)應(yīng)根據(jù)需要選用。在圖形符號(hào)中也可以標(biāo)注其保護(hù)方式，如圖1-8所示，斷路器圖形符號(hào)中標(biāo)注了失壓、過(guò)負(fù)荷、過(guò)電流3種保護(hù)方式。
美國(guó)Cutler-Hammer電氣品牌在工業(yè)、商業(yè)和民用電力輸配電和控制設(shè)備市場(chǎng)上于業(yè)界，Cutler-Hammer是伊頓公司主推的電氣品牌之一。

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