Year1
- 产品名称：
- 铁壳开关
- 型号：
- HH3-50/3Z
- 电流规格：
- 50A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-shell switch is relatively low (generally of type 6), 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-shell switch If the short-circuit current exceeds the breaking capacity of the fuse, 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 break and close, and there is still energy on the contact. It is equipped with an arc extinguishing cover, so the switching capacity is improved, and because of the iron shell protection, it is not easy to cause accidents caused by arc light during switching.
1. Scope of application
Series of iron shell load switches, It is suitable for AC circuits with rated working voltage, rated working current and frequency. It can be used to manually connect and break loaded circuits infrequently, and has short-circuit protection for the circuit.
2. Model and its meaning
3. Structural Features
The switch is structurally designed as a side rotation operation type and is divided into four parts: operating mechanism, fuse, iron shell and contact system.
The operating mechanism has quick breaking device, the closing and breaking speed of the switch is the same as the operating speed of the operator's hand, thus ensuring the safety of the operator and the equipment.
The contact system is equipped with an arc extinguishing chamber, and the contact system is completely installed in an iron box. In a closed state, ensuring 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 due to the interlocking of the cover and the operating mechanism. In addition, the cover can also be added Lock.
4. Technical data
The rated fusing short-circuit current of the fuse of the load switch at the rated voltage ~ should comply with the provisions of the following table.
The fuse of the load switch should be operated at the ambient air temperature of ℃, it will fuse within hours, and it will not fuse within hours (it is the rated operating current of the load switch).
5. Series iron shell load switch models
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