Iron case switch HH3-20/3Z

品名：

铁壳开关

型号：

HH3-20/3Z

电流规格：

20A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 , the short-circuit current exceeds the breaking capacity of the fuse, the fuse will explode, causing the accident to expand.
The series of closed load iron case switches are suitable for AC frequency, rated operating voltage to, rated operating current circuits, and can be used as It is used to manually make and break loaded circuits infrequently for overload and short-circuit protection.
Basic parameters
Rated frequency
Rated voltage
Rated current
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