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A circuit-breaker must control and protect, in case of faults or malfunctioning, the connected elements of a plant. In order to perform this function, after detection of an anomalous condition, the release intervenes in a definite time by opening the interrupting part. The protection releases fitted with ABB SACE moulded-case and air circuitbreakers can control and protect any plant, from the simplest ones to those with particular requirements, thanks to their wide setting possibilities of both thresholds and tripping times. Among the devices sensitive to overcurrents, the following can be considered: • thermomagnetic releases and magnetic only releases; • microprocessor-based releases; • residual current devices. The choice and adjusting of protection releases are based both on the requirements of the part of plant to be protected, as well as on the coordination with other devices; in general, discriminating factors for the selection are the required threshold, time and curve characteristic.1.3.1 THERMOMAGNETIC RELEASES AND MAGNETIC ONLY RELEASES The thermomagnetic releases use a bimetal and an electromagnet to detect overloads and short-circuits; they are suitable to protect both alternating and direct current networks. A circuit-breaker must control and protect, in case of faults or malfunctioning, the connected elements of a plant. In order to perform this function, after detection of an anomalous condition, the release intervenes in a definite time by opening the interrupting part. The protection releases fitted with ABB SACE moulded-case and air circuitbreakers can control and protect any plant, from the simplest ones to those with particular requirements, thanks to their wide setting possibilities of both thresholds and tripping times. Among the devices sensitive to overcurrents, the following can be considered: • thermomagnetic releases and magnetic only releases; • microprocessor-based releases; • residual current devices. The choice and adjusting of protection releases are based both on the requirements of the part of plant to be protected, as well as on the coordination with other devices; in general, discriminating factors for the selection are the required threshold, time and curve characteristic. The following table shows the types of thermo-magnetic and magnetic only trip units available for SACE Tmax XT and Tmax T circuit-breakers. CBs thermomagnetic releases MF MA TMD TMA TMG XT1 - - - - XT2 XT3 - - XT4 - - Legenda MF Fixed magnetic only releases MA Adjustable magnetic only releases TMG Thermomagnetic release for generator protection TMD Thermomagnetic release with adjustable thermal and fixed magnetic threshold TMA Thermomagnetic release with adjustable thermal and magnetic threshold

斷路器必須在發(fā)生故障或故障時(shí)控制和保護(hù)設(shè)備的連接元件。為了執(zhí)行此功能，在檢測(cè)到異常情況后，釋放裝置通過打開中斷部件在一定時(shí)間內(nèi)進(jìn)行干預(yù)。配備ABB SACE模制外殼和空氣斷路器的保護(hù)脫扣器可以控制和保護(hù)任何設(shè)備，從簡單的設(shè)備到有特殊要求的設(shè)備，這得益于其閾值和跳閘時(shí)間的廣泛設(shè)置可能性。在對(duì)過電流敏感的設(shè)備中，可以考慮以下情況：•熱磁釋放和純磁釋放；•基于微處理器的版本剩余電流裝置。保護(hù)脫扣器的選擇和調(diào)整既基于待保護(hù)裝置部分的要求，也基于與其他裝置的協(xié)調(diào)；一般來說，選擇的判別因素是所需的閾值、時(shí)間和曲線特征。1.3.1熱磁脫扣器和僅磁脫扣器熱磁脫扣器使用雙金屬和電磁鐵檢測(cè)過載和短路；它們適用于保護(hù)交流和直流網(wǎng)絡(luò)。斷路器必須在發(fā)生故障或故障時(shí)控制和保護(hù)設(shè)備的連接元件。為了執(zhí)行此功能，在檢測(cè)到異常情況后，釋放裝置通過打開中斷部件在一定時(shí)間內(nèi)進(jìn)行干預(yù)。配備ABB SACE模制外殼和空氣斷路器的保護(hù)脫扣器可以控制和保護(hù)任何設(shè)備，從簡單的設(shè)備到有特殊要求的設(shè)備，這得益于其閾值和跳閘時(shí)間的廣泛設(shè)置可能性。在對(duì)過電流敏感的設(shè)備中，可以考慮以下情況：•熱磁釋放和純磁釋放；•基于微處理器的版本剩余電流裝置。保護(hù)脫扣器的選擇和調(diào)整既基于待保護(hù)裝置部分的要求，也基于與其他裝置的協(xié)調(diào)；一般來說，選擇的判別因素是所需的閾值、時(shí)間和曲線特征。下表顯示了SACE Tmax XT和Tmax T斷路器可用的熱磁和純磁跳閘裝置的類型。CBs熱磁脫扣器MF MA TMD TMA TMG XT1--XT2 XT3--XT4--Legenda MF固定磁脫扣器MA可調(diào)磁脫扣器TMG熱磁脫扣器用于發(fā)電機(jī)保護(hù)TMD熱磁脫扣器具有可調(diào)熱閾值和固定磁閾值TMA熱磁脫扣器具有可調(diào)熱閾值和磁閾值