斷路器工作原理示意圖及圖形符號
熱脫扣器用于線路的過負荷保護，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，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，斷路器可以正常合閘；當停電或電壓很低時，失壓脫扣器的吸力小于彈簧的反力，彈簧使動鐵心向上使掛鉤脫扣，實現短路器的跳閘功能。
分勵脫扣器用于遠方跳閘，當在遠方按下按鈕時，分勵脫扣器得電產生電磁力，使其脫扣跳閘。
不同斷路器的保護是不同的，使用時應根據需要選用。在圖形符號中也可以標注其保護方式，如圖1-8所示，斷路器圖形符號中標注了失壓、過負荷、過電流3種保護方式。
美國Cutler-Hammer電氣品牌在工業、商業和民用電力輸配電和控制設備市場上，Cutler-Hammer是伊頓公司主推的電氣品牌之一。
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主要產品：
塑殼斷路器、漏電開關、空氣斷路器、真空斷路器、控制柜
Cutler-Hammer主要產品：
Cutler-Hammer塑殼斷路器
Cutler-Hammer漏電開關
Cutler-Hammer控制柜
Cutler-Hammer空氣斷路器
Cutler-Hammer真空斷路器
卡特拉-漢莫 斷路器 Cutler-Hammer
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UVH1RT22K
UVH1RT24
UVH1RT24K
UVH1RT26K
UVH2LP02K
UVH2LP03K
UVH2LP05K
UVH2LP08K
UVH2LP11K
UVH2LP15K
UVH2LP20K
UVH2LP21K
UVH2LP23K
UVH2LP26K
UVH2LP28K
UVH2LT02K
UVH2LT03K
UVH1LT08K
UVH2LT05K
UVH2LT08K
UVH2LT11K
UVH2LT15K
UVH2LT20K
UVH2LT21K
UVH2LT23K
UVH2LT26K
UVH2LT28K
UVH2RP02K
UVH2RP03K
UVH2RP05K
UVH2RP08K
UVH2RP11K
UVH2RP15K
UVH2RP20K
UVH2RP21K
UVH2RP23K
UVH2RP26K
UVH2RP28K
UVH2RT02K
UVH2RT03K
UVH2RT05K
UVH2RT08K
UVH2RT11K
UVH2RT15K
UVH2RT20K
UVH2RT21K
UVH2RT23K
UVH2RT26K
UVH2RT28K
UVH3LP02K
UVH3LP03K
UVH3LP05K
UVH3LP08K
UVH3LP11K
UVH3LP15K
UVH3LP20K
UVH3LP21K
UVH3LP23K
UVH3LP26K
UVH3LP28K
UVH3LT02K
UVH3LT03K
UVH3LT05K
UVH3LT08K
UVH3LT11K
UVH3LT15K
UVH3LT20K
UVH3LT21K
UVH3LT23K
UVH3LT26K
UVH3LT28K
UVH3RP02K
UVH3RP03K
UVH3RP05K
UVH3RP08K
UVH3RP11K
UVH3RP15K
UVH3RP20K
UVH3RP21K
UVH3RP23K
UVH3RP26K
UVH3RP28K
UVH3RT02K
UVH3RT03K
UVH3RT05K
UVH3RT08K
UVH3RT11K
UVH3RT15K
UVH3RT20K
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