Year1
- 产品名称：
- 铁壳开关、负荷开关
- 型号：
- HH3-200/3Z
- 电流规格：
- 200A三相四线
The official name of the iron case switch is a closed 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, so it should be installed at the end of the line where the short-circuit current is not large. Otherwise, when a short circuit occurs in the line below the iron case switch, If the short-circuit current exceeds the breaking capacity of the fuse, the fuse will explode, causing the accident to expand.
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. An arc extinguishing cover is also installed on the contact, so the switching capacity is improved, and it is protected by the iron shell. It is not easy to cause accidents caused by arc light injuring people when switching on and off.
One scope of application
The series of iron-shell load switches are suitable for AC circuits with rated operating voltage, rated operating current and frequency of 0. It can be used to manually connect and break loaded circuits infrequently, and to control the circuit. There is short circuit protection.
Two-iron shell load switch models and their meanings
Three-iron shell load switch structural features
The switch is structurally designed as a side rotation operation type and is divided into four parts. The operating mechanism, the fuse iron shell and contact system.
The operating mechanism has a quick breaking device. The closing and breaking speed of the switch is in accordance with the speed of the operator's hand, thereby ensuring the safety of the operator and the equipment.
The contact system is equipped with an arc extinguishing chamber. The contact system is entirely installed in an iron box and is completely closed to ensure personnel safety.
After the cover is closed, it can be wedged with the lock. When the switch is in the closed position, the cover cannot be opened because the cover is interlocked with the operating mechanism. In addition, the cover can also be locked.
Technical data of four-iron shell load switch
The rated fusing short-circuit current of the fuse of the load switch under the rated voltage should comply with the provisions of the following table.
The fuse of the iron-shell load switch must melt within hours when the ambient air temperature is ℃. If the fuse does not melt within hours, it is the rated operating current of the load switch.
Five series iron shell load switch model
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