ABB miniature circuit breaker Sh200 series is a branch of S200 series, belonging to the same generation of products. The difference between Sh200 series and S200 series is that some mechanisms that can add accessories are removed, the internal structure is simplified, and the cost of products is reduced. So Sh200 series is also known as building type special miniature circuit breaker (generally, the miniature circuit breaker used in buildings does not need the function of adding accessories). Sh200 series is a miniature circuit breaker, which can be used to distribute electric energy, start asynchronous motor infrequently, protect the power line and motor, and cut off the circuit automatically in case of serious overload, short circuit, undervoltage and other faults. Its function is equivalent to the combination of fuse switch and overheating relay

在民用建筑設(shè)計(jì)中低壓斷路器主要用于線路的過(guò)載、短路、過(guò)電流、失壓、欠壓、接地、漏電、雙電源自動(dòng)切換及電動(dòng)機(jī)的不頻繁起動(dòng)時(shí)的保護(hù)、操作等用途，其選擇原則除遵守低壓電器設(shè)備的使用環(huán)境特征等基本原則（見(jiàn)工業(yè)與民用配電設(shè)計(jì)手冊(cè)）外尚應(yīng)考慮如下條件：

In the design of civil buildings, low-voltage circuit breakers are mainly used for overload, short circuit, over-current, loss of voltage, under voltage, grounding, leakage, automatic switching of dual power supply and protection and operation of motor when starting infrequently, In addition to the basic principles such as the operating environment characteristics of low-voltage electrical equipment (see industrial and civil power distribution design manual), the following conditions should also be considered for the selection:

斷路器的額定電壓不應(yīng)小于線路額定電壓；

The rated voltage of circuit breaker shall not be less than the rated voltage of line;

斷路器額定電流與過(guò)流脫扣器的額定電流不小于線路的計(jì)算電流；

The rated current of circuit breaker and over-current release shall not be less than the calculated current of line;

斷路器的額定短路分?jǐn)嗄芰Σ恍∮诰€路中短路電流；

The rated short-circuit breaking capacity of the circuit breaker shall not be less than the short-circuit current in the line;

選擇型配電斷路器需考慮短延時(shí)短路通斷能力和延時(shí)保護(hù)級(jí)間配合；

The short-time short-circuit on-off capability and the coordination between delay protection levels should be considered for the selective distribution circuit breaker;

斷路器欠壓脫扣器額定電壓等于線路額定電壓；

The rated voltage of under voltage release of circuit breaker is equal to the rated voltage of line;

當(dāng)用于電動(dòng)機(jī)保護(hù)時(shí)，則選擇斷路器需考慮電動(dòng)機(jī)的起動(dòng)電流并使之在起動(dòng)時(shí)間內(nèi)不動(dòng)作；設(shè)計(jì)計(jì)算見(jiàn)“工業(yè)與民用配電設(shè)計(jì)手冊(cè)”；

When the circuit breaker is used for motor protection, the starting current of the motor should be considered and the circuit breaker should not operate within the starting time; See "industrial and civil power distribution design manual" for design calculation;

斷路器選擇還應(yīng)考慮斷路器與斷路器、斷路器與熔斷器的選擇性配合。

The selection of circuit breaker should also consider the selective cooperation between circuit breaker and circuit breaker, circuit breaker and fuse.