Iron shell load switch HH12-10/3Z price parameter details

产品名称：

铁壳开关，负荷开关

型号：

HH12-10/3Z

电流规格：

10A三相四线

The official name of iron shell load switch is enclosed load switch or fuse load switch. It is a casing made of steel plate or cast iron, equipped with a fuse for cutting off short-circuit current, a knife switch for connecting and breaking the circuit, and an operating mechanism for operating the knife switch. It can therefore be manually operated for infrequent making and breaking of circuits and for short-circuit protection. It is widely used in electrical installations in industrial and mining enterprises, electric heating lighting and rural power drainage and irrigation, and can be used for infrequent direct starting and stopping of small induction motors.
The ultimate breaking capacity of the fuse installed in the iron case switch is relatively low (generally
so it should be installed at the end of the line where the short-circuit current is not large, otherwise when the line below the iron case switch When a short circuit occurs, the short-circuit current exceeds the breaking capacity of the fuse, and the fuse will explode, exacerbating the accident.
The knife switch of the iron-shell switch is equipped with an energy-storage operating mechanism, which allows the knife to quickly open and close. The contacts are also equipped with arc extinguishing covers, so the switching capacity is improved, and the iron shell protects the arc from injuring people when making and breaking.
The iron shell switch is used to operate small induction motors. When it is used for direct starting and stopping infrequently, it is generally recommended to control motors below
, and also used to control motors below
. This is because most users use it to control motors below
We have gained a lot of experience in using electric motors. When used to control the above electric motors, arc-burning accidents have occurred. Because the iron-clad switch contacts are not good enough, the fuse is easy to break, causing the motor to run out of phase. There are many cases, so the capacity of the motor directly started by the iron case switch should not be overused. From the comparison of technical and economic indicators, the iron case switch is only more economical than automatic shutdown when used for direct starting of the following motors.