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優(yōu)勢(shì)：
•成本節(jié)約解決方案；
•極快速跳閘。
缺點(diǎn)：
•歧視值極低；
•服務(wù)質(zhì)量低，因?yàn)橹辽賰蓚€(gè)串聯(lián)斷路器必須跳閘。
斷路器和開(kāi)關(guān)之間的協(xié)調(diào)
隔離開(kāi)關(guān)
隔離開(kāi)關(guān)
隔離開(kāi)關(guān)源于相應(yīng)的斷路器
它們保留了外形尺寸、固定系統(tǒng)和
安裝為基本版本提供的所有附件。它們是設(shè)備
它可以在正常工作條件下接通、攜帶和斷開(kāi)電流
電路。
它們也可用作子配電盤(pán)中的通用斷路器、斷路器或隔離安裝部件，如線(xiàn)路、母線(xiàn)或負(fù)載組。
一旦觸點(diǎn)斷開(kāi)，這些開(kāi)關(guān)保證隔離，這得益于
它們的觸點(diǎn)，其處于適當(dāng)?shù)木嚯x，以防止電弧沖擊
符合有關(guān)能力傾向標(biāo)準(zhǔn)的規(guī)定
隔離
隔離開(kāi)關(guān)的保護(hù)
每個(gè)隔離開(kāi)關(guān)應(yīng)由一個(gè)協(xié)調(diào)裝置保護(hù)，該裝置
防止過(guò)電流，通常是一個(gè)斷路器能夠限制
短路電流和允許通過(guò)的能量值在可接受的水平
隔離開(kāi)關(guān)。
關(guān)于過(guò)載保護(hù)，斷路器的額定電流應(yīng)為
小于或等于待保護(hù)隔離開(kāi)關(guān)的尺寸。
關(guān)于SACE Tmax XT和Tmax T系列隔離開(kāi)關(guān)
協(xié)調(diào)表顯示了可保護(hù)其免受沖擊的斷路器
指示的預(yù)期短路電流值。
關(guān)于Emax系列隔離開(kāi)關(guān)，有必要驗(yàn)證
安裝點(diǎn)的短路電流值低于短時(shí)
耐受電流I
隔離開(kāi)關(guān)的cw，且峰值低于
閉合電流值（Icm）。

Advantages: • cost-saving solution; • extremely rapid tripping. Disadvantages: • extremely low discrimination values; • low service quality, since at least two circuit-breakers in series have to trip. Coordination between circuit-breaker and switch disconnector The switch disconnector The switch disconnectors derive from the corresponding circuit-breakers, of which they keep the overall dimensions, the fixing systems and the possibility of mounting all the accessories provided for the basic versions. They are devices which can make, carry and break currents under normal service conditions of the circuit. They can also be used as general circuit-breakers in sub-switchboards, as busties, or to isolate installation parts, such as lines, busbars or groups of loads. Once the contacts have opened, these switches guarantee isolation thanks to their contacts, which are at the suitable distance to prevent an arc from striking in compliance with the prescriptions of the standards regarding aptitude to isolation. Protection of switch disconnectors Each switch disconnector shall be protected by a coordinated device which safeguards it against overcurrents, usually a circuit-breaker able to limit the short-circuit current and the let-through energy values at levels acceptable for the switch-disconnector. As regards overload protection, the rated current of the circuit-breaker shall be lower than or equal to the size of the disconnector to be protected. Regarding SACE Tmax XT and Tmax T series switch disconnectors the coordination tables show the circuit-breakers which can protect them against the indicated prospective short-circuit currents values. Regarding Emax series switch disconnectors it is necessary to verify that the short-circuit current value at the installation point is lower than the short-time withstand current I cw of the disconnector, and that the peak value is lower than the making current value (Icm).